Literature Survey on Hydrogen Separation Technique

Literature Survey on Hydrogen Separation Technique Literature review has been performed in order to identify recent publications on hydrogen separation methods, hydrogen solubility, materials and concepts in research institutes and laboratories. The aim of the performed literature survey was to monitor recent worldwide literature and find out whether some of the developed and reported solutions might possibly help to improve existing hydrogen separation concept in PDh system, enabling efficient complete separation of hydrogen from all unwanted hydrocarbons. Literature survey on hydrogen separation technique Basically there are four important methods applied to the separation of gases in the industry: absorption, adsorption, cryogenic and membranes. Pressure swing adsorption (PSA) is a gas purification process consisting of the removal of impurities on adsorbent beds. The usual adsorbents and gases adsorbed are molecular sieves for carbon monoxide, activated carbon for CO2, activated alumina or silica gel. Industrial PSA plants consist of up to 12 adsorbers and along with the number of valves required this makes the system rather complicated and complex. The PSA process is usually a repeating sequence of the following steps: adsorption at feed pressure, co-current depressurisation to intermediate pressure, counter-current depressurisation to atmospheric pressure usually starting at 10 % to 70 % of the feed pressure, counter-current purge with hydrogen enriched or product gas at ambient pressure, co-current pressure equalisation and finally, co-current pressurisation with feed or secondary process gas[1]. For hydrogen purification by PSA hydrogen purity is high but the amount of rejected hydrogen is also relatively high (10 †“ 35 %). It seems also that cryogenic technology might not be applicable for PDh process gas separation. Cooling down the mixture will finally end in a solid jet fuel and a gas phase. Handling the solid is more difficult when compared with liquid. During the survey it became evident that membrane technology is the most popular, used and still investigating for the improvement process for hydrogen separation therefore the focus of the study is mainly on this technique. The membrane separation process involves several elementary steps, which include the solution of hydrogen and its diffusion as atomic hydrogen through the membrane bulk material. Nowadays, membrane technologies are becoming more frequently used for separation of wide varying mixtures in the petrochemical related industries. According to Sutherland[2] it is estimated that bulk chemicals and petrochemicals applications represented about 40% of the membrane market in the whole chemicals industry or about $ 1.5 billions, growing over 5 % per year. Membrane gas separation is attractive because of its simplicity and low energy cost. The advantages of using membrane gas separation technologies could be summarized as following: Continuous and clean process, membranes do not require regeneration, unlike the adsorption or the absorption processes, which require regeneration step leading to the use of two solid beds or a solvent regeneration unit. Required filtration system is simple and inexpensive. Compared with conventional techniques, membranes can offer a simple, easy-to-operate, low-maintenance process. Membrane process is simple, generally carried out at atmospheric conditions which, besides being energy efficient, can be important for sensitive applications in pharmaceutical and food industry. The recovery of components from a main stream using membranes can be done without substantial additional energy costs. Membrane is defined essentially as a barrier, which separates two phases and restricts transport of various chemicals in a selective manner. A membrane can be homogenous or heterogeneous, symmetric or asymmetric in structure, solid or liquid; can carry a positive or negative charge or be neutral or bipolar. Transport through a membrane can be affected by convection or by diffusion of individual molecules, induced by an electric field or concentration, pressure or temperature gradient. It takes place when a driving force is applied to the components in the feed. In most of the membrane processes, the driving force is a pressure difference or a concentration (or activity) difference across the membrane. Another driving force in membrane separations is the electrical potential difference. This driving force only influences the transport of charged particles or molecules. The hydrogen separation factor is sometimes used to specify membrane quality. It is defined as following: where ni stands for moles of species i transferred through the membrane and ?pi stands for the partial pressure difference of species i through the membrane. The membrane thickness may vary from as small as 10 microns to few hundred micrometers. Basic types of membranes are presented in Figure 4. Membranes in petrochemical industry are mainly used for concentration, purification and fractionation however they may be coupled to a chemical reaction to shift the chemical equilibrium in a combination defined as a membrane reactor. Using a membrane is adding costs to any process, therefore in order to overcome the cost issue another advantages must overcome the added expenses like material with a very good separation factor, high flux, high quality membrane materials (stable during many months of operation). In a membrane separation reactor both organic and inorganic membranes can be used. Many industrial catalytic processes involve the combination of high temperature and chemically harsh environments favouring therefore inorganic membranes due to their thermal stability, resistance to organic solvents, chlorine and other chemicals. Some promising applications using inorganic membranes include certain dehydrogenation, hydrogenation and oxidation reactions like formation of butane from dehydrogenation of ethyl benzene, styrene production from dehydrogenation of ethyl benzene, dehydrogenation of ethane to ethane, oxidative coupling of methane etc. In membrane reactor two basic concepts can be distinguished as can be seen in Figure 5. reaction and separation combined in one reactor (catalytic membrane reactor) reaction and separation are not combined and the reactants are recycled along a membrane system (membrane recycle reactor) Catalytic membrane reactor concept is used especially with inorganic membranes (ceramics, metals) and polymeric membranes where the catalyst is coupled to the membrane. Membrane recycle reactor can be applied with any membrane process and type of membranes. Most of the chemical reactions need catalyst to enhance the reaction kinetics. The catalyst must be combined with the membrane system and various arrangements are possible, as can be seen in Figure 6. The advantage of the catalyst located inside the bore of the tube is simplicity in preparation and operation. When needed the catalyst could be easily replaced. In case of top layer filled with catalyst and membrane wall, the catalyst is immobilized onto the membrane. Palladium has been known to be a highly hydrogen permeable and selective material since the 19th century. The existing Pd-based membranes can be mainly classified into two types according to the structure of the membrane as (i) self-supporting Pd-based membranes and (ii) composite structures composed of thin Pd-based layers on porous materials. Most self-supporting Pd-based membranes are commercially available in the forms that are easily integrated into a separation setup. However these membranes are relatively thick (50 mm or more) and therefore the hydrogen flux through them is limited. Thick palladium membranes are expensive and rather suitable for use in large scale chemical production. For practical use it is necessary to develop separation units with reduced thickness of the layer. An additional problem is that in order to have adequate mechanical strength, relatively thick porous supports have to be used. In the last decade a significant research has been carried out to achie ve higher fluxes by depositing thin layers of Pd or Pd alloys on porous supports like ceramics or stainless steel. A submicron thick and defect-free palladium-silver (Pd-Ag) alloy membrane was fabricated on a supportive microsieve by using microfabrication technique and tested by Tong et al[4]. The technique also allowed production of a robust wafer-scale membrane module which could be easily inserted into a membrane holder to have gas-tight connections to outside. Fabricated membrane had a great potential for hydrogen purification and in application like dehydrogenation industry. One membrane module was investigated for a period of ca. 1000 hours during which the membrane experienced a change in gas type and its concentration as well as temperature cycling between 20 – 450  °C. The measured results showed no significant reduction in flux or selectivity, suggesting thus very good membrane stability. The authors carried out experiments with varying hydrogen concentration in the feed from 18 to 83 kPa at 450  °C to determine the steps limiting H2 transport rate. It is assumed that the fabricated membrane may be used as a membrane reactor for dehydrogenation reactions to synthesize high value products although its use may be limited due to high pressures of tens of bars. Schematic drawing of the hydrogen separation setup is presented in Figure 7. The membrane module was placed in a stainless steel holder installed in a temperature controlled oven to ensure isothermal operation. The H2/He feed (from 300 to 100 ml/mol) was preheated in spirals placed in the same oven. The setup was running automatically for 24 h/day and could handle 100 recipes without user intervention. Tucho et al.[5] performed microstructural studies of self-supported Pd / 23 wt. % Ag hydrogen separation membranes subjected to different heat treatments (300/400/450  °C for 4 days) and then tested for hydrogen permeation. It was noted that changes in permeability were dependent on the treatment atmosphere and temperature as well as membrane thickness. At higher temperatures significant grain growth was observed and stress relaxation occurred. Nam et al.[6] were able to fabricate a highly stable palladium alloy composite membrane for hydrogen separation on a porous stainless steel support by the vacuum electrodeposition and laminating procedure. The membrane was manufactured without microstructural change therefore it was possible to obtain both high performance (above 3 months of operation) and physical and morphological stability of the membrane. It was observed that the composite membrane had a capability to separate hydrogen from gas mixture with complete hydrogen selectivity and could be used to produce ultra-pure hydrogen for applications in membrane reactor. Tanaka et al.[7] aimed at the improved thermal stability of mesoporous Pd-YSZ-g-Al2O3 composite membrane. The improved thermal stability allowed operation at elevated temperature (> 500  °C for 200 hours). This was probably the result of improved fracture toughness of YSZ-g-Al2O3 layer and matching thermal expansion coefficient between palladium and YSZ. Kuraoka, Zhao and Yazawa[8] demonstrated that pore-filled palladium glass composite membranes for hydrogen separation prepared by electroless plating technique have both higher hydrogen permeance, and better mechanical properties than unsupported Pd films. The same technique was applied by Paglieri et al.[9] for plating a layer of Pd and then copper onto porous ?-substrate. Zahedi et al.[10] developed a thin palladium membrane by depositing Pd onto a tungsten oxide WO3 modified porous stainless steel disc and reported that permeability measureme nts at 723, 773 and 823 K showed high permeability and selectivity for hydrogen. The membrane was stable with regards to hydrogen for about 25 days. Certain effort has been performed for improving hydrothermal stability and application to hydrogen separation membranes at high temperatures. Igi et al.[11] prepared a hydrogen separation microporous membranes with enhanced hydrothermal stability at 500  °C under a steam pressure of 300 kPa. Co-doped silica sol solutions with varying Co composition (Co / (Si + Co) from 10 to 50 mol. %) were prepared and used for manufacturing the membranes. The membranes showed increased hydrothermal stability and high selectivity and permeability towards hydrogen when compared with pure silica membranes. The Co-doped silica membranes with a Co composition of 33 mol. % showed the highest selectivity for hydrogen, with a H2 permeance of 4.00 x 10-6 (m3 (STP) Ãâ€" (m Ãâ€" s Ãâ€" kPa)-1) and a H2/N2 permeance ratio of 730. It was observed that as the Co composition increased as high as 33 %, the activation energy of hydrogen permeation decreased and the H2 permeance increased. Additional increase in Co concentration resulted in increased H2 activation energy and decreased H2 permeance. Due to high permselectivity of Pd membranes, high purity of hydrogen can be obtained directly from hydrogen containing mixture at high temperatures without further purification providing if sufficient pressure gradient is applied. Therefore it is possible to integrate the reforming reaction and the separation step in a single unit. A membrane reformer system is simpler, more compact and more efficient than the conventional PSA system (Pressure Swing Adsorption) because stem reforming reaction of hydrocarbon fuels and hydrogen separation process take place in a single reactor simultaneously and without a separate shift converter and a purification system. Gepert et al.[12] have aimed at development of heat-integrated compact membrane reformer for d ecentralized hydrogen production and worked on composite ceramic capillaries (made of ?-Al2O3) coated with thin palladium membranes for production of CO-free hydrogen for PEM fuel cells by alcohol reforming. The membranes were tested for pure hydrogen and N2 as well as for synthetic reformate gas. The process steps comprised the evaporation and overheating of the water/alcohol feed, water gas shift combined with highly selective hydrogen separation. The authors have focused on the step concerned with the membrane separation of hydrogen from the reforming mixture and on the challenges and requirements of that process. The challenges encountered with the development of capillary Pd membranes were as following: long term temperature and pressure cycling stability in a reformate gas atmosphere, the ability to withstand frequent heating up and cooling down to room temperature, avoidance of the formation of pin-holes during operation and the integration of the membranes into reactor housi ng. It was observed that palladium membranes should not be operated at temperatures below 300  °C and pressures lower than 20 bar, while the upper operating range is between 500 and 900  °C. Alloying the membrane with copper and silver extend their operating temperature down to a room temperature. The introduction of silver into palladium membrane increases the lifetime, but also the costs when compared with copper. Detailed procedure of membrane manufacturing, integration into reformer unit and testing is described by the authors. Schematic of the concept of the integrated reformer is shown in Figure 8. The membrane was integrated in a metal tube embedded in electrically heated copper plates. Before entering the test tube, the gases were preheated to avoid local cooling of the membrane. Single gas measurements with pure N2 and H2 allowed the testing of the general performance of the membrane and the permselectivity for the respective gases to be reached. Synthetic reformate gas consisting of 75 % H2, 23.5 % CO2 and 1.5 % CO was used to get information about the performance. The membranes were tested between 370 – 450  °C and pressures up to 8 bar. The authors concluded that in general the membranes have shown good performance in terms of permeance and permselectivity including operation under reformate gas conditions. However, several problems were indicated concerning long-term stability under real reforming conditions, mainly related to structural nature (combination of different materials: ceramic, glaze, palladium resulted on incoherent potential for causing membrane failure). At operation times up to four weeks the continuous Pd layer remained essentially free from defects and pinholes. Han et al.[13] have developed a membrane separation module for a power equivalent of 10 kWel. A palladium membrane containing 40 wt. % copper and of 25 mm thickness was bonded into a metal frame. The separation module for a capacity of 10 Nm3 h-1 of hydrogen had a diameter of 10.8 cm and a length of 56 cm. Reformate fed to the modules contained 65 vol. % of hydrogen and the hydrogen recovery through the membrane was in the range of 75 %. Stable operation of the membrane separation was achieved for 750 pressure swing tests at 350  °C. The membrane separation device was integrated into a methanol fuel processor. Pientka et al.[14] have utilized a closed-cell polystyrene foam (Ursa XPS NIII, porosity 97 %) as a membrane buffer for separation of (bio)hydrogen. In the foam the cell walls formed a structured complex of membranes. The cells served as pressure containers of separated gases. The foam membrane was able to buffer the difference between the feed injection rate and the rate of consumption of the product. Using the difference in time-lags of different gases in polymeric foam, efficient gas separation was achieved during transient state and high purity hydrogen was obtained. Argonne National Laboratory (ANL) is involved in developing dense hydrogen-permeable membranes for separating hydrogen from mixed gases, particularly product streams during coal gasification and/or methane reforming. Novel cermet (ceramic-metal composite) membranes have been developed. Hydrogen separation with these membranes is non-galvanic (does not use electrodes or external power supply to drive the separation and hydrogen selectivity is nearly 100 % because the membrane contain no interconnected porosity). The membrane development at ANL initially concentrated on a mixed proton/electron conductor based on BaCe0.8Y0.2O3-d (BCY), but it turned to be insufficient to allow high non-galvanic hydrogen flux. To increase the electronic conductivity and thereby to increase the hydrogen flux the development focused on various cermet membranes with 40-50 vol. % of metal or alloy dispersed in the ceramic matrix. Balachandran et al.[15],[16] described the development performed at ANL. The powder mixture for fabricating cermet membranes was prepared by mechanical mixing Pd (50 vol. %) with YSZ, after that the powder mixture was pressed into discs. Polished cermet membranes were affixed to one end of alumina tube using a gold casket for a seal (as can be seen in Figure 9). In order to measure the hydrogen permeation rate, the alumina tube was inserted into a furnace with a sealed membrane and the associated gas flow tubes. Hydrogen permeation rate for Pd/YSZ membranes has been measured as a function of temperature (500-900  °C), partial pressure of hydrogen in the feed stream (0.04-1.0 atm.) and membrane thickness ( » 22-210 mm) as well as versus time during exposure to feed gases containing H2, CO, CO2, CH4 and H2S. The highest hydrogen flux was  » 20.0 cm3 (STP)/min cm2 for  » 22- mm thick membrane at 900  °C using 100 % hydrogen as the feed gas. These results suggested that membranes with thickness In the last decade Matrimid 5218 (Polyimide of 3,3,4,4-benzophenone tetracarboxylic dianhydride and diamino-phenylindane) has attracted a lot of attention as a material for gas separation membranes due to the combination of relatively high gas permeability coefficients and separation factors combined with excellent mechanical properties, solubility in non-hazard organic solvents and commercial availability. Shishatskiy et al.[18] have developed asymmetric flat sheet membranes for hydrogen separation from its mixtures with other gases. The composition and conditions of membrane preparation were optimized for pilot scale membrane production. The resulting membrane had a high hydrogen flux (1 m3 (STP)/m2h*bar) and selectivity of H2/CH4 at least 100, close to the selectivity of Matrimid 5218, material used for asymmetric structure formation. The hydrogen flux through the membranes increased with the decrease of polymer concentration and increase of non-solvent concentration. In addition, the influence of N2 blowing over the membrane surface (0, 2, 3, 4 Nm3 h-1 flow rate) was studied and it was proved that the selectivity of the membrane decreased with increase of the gas flow. The SEM image of the membrane supported by Matrimid 5218 is shown in Figure 10. The stability against hydrocarbons was tested by immersion of the membrane into the mixture of n-pentane/n-hexane/toluene in 1:1:1 ratio. Stability tests showed that the developed membrane was stable against mixtures of liquid hydrocarbons and could withstand continuous heating up to 200  °C for 24 and 120 hours and did not lose gas separation properties after exposure to a mixture of liquid hydrocarbons. The polyester non-woven fabric used as a support for the asymmetric membrane gave to the membrane excellent mechanical properties and allowed to use the membrane in gas separation modules. Interesting report on development of compact hydrogen separation module called MOC (Membrane On Catalyst) with structured Ni-based catalyst for use in the membrane reactor was presented by Kurokawa et al[19]. In the MOC concept a porous support itself had a function of reforming catalyst in addition to the role of membrane support. The integrated structure of support and catalyst made the membrane reformer more compact because the separate catalysts placed around the membrane modules in the conventional membrane reformers could be eliminated. In that idea first a porous catalytic structure 8YSZ (mixture of NiO and 8 mol. % Y2O3-ZrO2 at the weight ratio 60:40) was prepared as the support structure of the hydrogen membrane. The mixture was pressed into a tube closed at one end and sintered then in air. Slurry of 8YSZ was coated on the external surface of the porous support and heat-treated for alloying. Obtained module of size 10 mm outside and 8 mm inside diameter, 100 ~ 300 mm length and the membrane thickness was 7 ~ 20 mm were heated in flowing hydrogen at 600  °C for 3 hours to reduce NiO in the support structure into Ni before use (the porosity of the support after reduction was 43 %). A stainless steel cap and pipe were bonded to the module to introduce H2 into the inside of the tubular module. Figure 11 presents the conceptual structure design of the MOC module as compared with the structure of the conventional membrane reformer. The sample module in the reaction chamber was placed in the furnace and heated at 600  °C, pre-heated hydrogen (or humidified methane) was supplied inside MOC at the pressure of 0.1 MPa and the permeated hydrogen was collected from the outside chamber around the module at ambient pressure. The 100 ~ 300 mm long modules with 10 mm membrane showed hydrogen flux of 30 cm3 per minute per cm2 which was two times higher than the permeability of the conventional modules with palladium based alloy films. Membrane On Catalyst modules have a great potential to be applied to membrane reformer systems. In this concept a porous support itself has a function of reforming catalyst in addition to the role of membrane support. It seems that Membrane On Catalyst modules have a great potential to be applied to membrane reformer systems. Amorphous alloy membranes composed primarily of Ni and early transition metals (ETM) are an inexpensive alternative to Pd-based alloy membranes, and these materials are therefore of particular interest for the large-scale production of hydrogen from carbon-based fuels. Catalytic membrane reactors can produce hydrogen directly from coal-derived synthesis gas at 400 °C, by combining a commercial water-gas shift (WGS) catalyst with a hydrogen-selective membrane. Three main classes of membrane are capable of operating at the high temperatures demanded by existing WGS catalysts: ceramic membranes producing pure hydrogen via ion-transfer mechanism at  ³ 600  °C, alloy membranes which produce pure hydrogen via a solution-diffusion mechanism between 300 – 500  °C and microporous membranes, typically silica or carbon, whose purity depends on the pore size of the membrane and which operate over a wide temperature range dependent on the membrane material. In order to explore the suitability of Ni-based amorphous alloys for this application, the thermal stability and hydrogen permeation characteristics of Ni-ETM amorphous alloy membranes has been examined by Dolan et al[20]. Fundamental limitation of these materials is that hydrogen permeability is inversely proportional to the thermal stability of the alloy. Alloy design is therefore a compromise between hydrogen production rate and durability. Amorphous Ni60Nb(40-x)Zr(x) membranes have been tested at 400 °C in pure hydrogen, and in simulated coal-derived gas streams with high steam, CO and CO2 levels, without severe degradation or corrosion-induced failure. The authors have concluded that Ni-Nb-Zr amorphous alloys are therefore prospective materials for use in a catalytic membrane reactor for coal-derived syngas. Much attention has been given to inorganic materials such as zeolite, silica, zirconia and titania for development of gas- and liquid- separation membranes because they can be utilized under har sh conditions where organic polymer membranes cannot be applied. Silica membranes have been studied extensively for the preparation of various kinds of separation membranes: hydrogen, CO2 and C3 isomers. Kanezeashi[21] have proposed silica networks using an organo-inorganic hybrid alkoxide structure containing the organic groups between two silicon atoms, such as bis(triethoxysilyl)ethane (BTESE) for development of highly permeable hydrogen separation membranes with hydrothermal stability. The concept for improvement of hydrogen permeability of silica membrane was to design a loose-organic-inorganic hybrid silica network using mentioned BTESE (to shift the silica networks to a larger pore size for an increase in H2 permeability). A hybrid silica layer was prepared by coating a silica-zirconia intermediate layer with a BTESE polymer sol followed by drying and calcination at 300 °C in nitrogen. A thin, continuous separation layer of hybrid silica for selective H2 permeation was observed on top of the SiO2-ZrO2 intermediate layer as presented in Figure 12. Hybrid silica membranes showed a very high H2 permeance, ~ 1 order of magnitude higher (~ 10-5 mol m-2 s-1 Pa-1) than previously r eported silica membranes using TEOS (Tetraethoxysilane). The hydrothermal stability of the hybrid silica membranes due to the presence of Si-C-C-Si bonds in the silica networks was also confirmed. Nitodas et al.[22] for the development of composite silica membranes have used the method of chemical vapour deposition (CVD) in the counter current configuration from TEOS and ozone mixtures. The experiments were conducted in a horizontal hot-wall CVD quartz reactor (Figure 13) under controlled temperature conditions (523 – 543 K) and at various reaction times (0 -15 hours) and differential pressures across the substrate sides using two types of substrates: a porous Vycor tube and alumina (g-Al2O3) nanofiltration (NF) tube. The permeance of hydrogen and other gases (He, N2, Ar, CO2) were measured in a home-made apparatus (able to operate under high vacuum conditions 10-3 Torr, feed pressure up to 70 bar) and the separation capability of the composite membranes was determined by calculating the selectivity of hydrogen over He, N2, Ar, CO2. The in-situ monitoring of gas permeance during the CVD development of nanoporous membranes created a tool to detect pore size alterations i n the micro to nanometer scale of thickness. The highest permeance values in both modified and unmodified membranes are observed for H2 and the lowest for CO2. This indicated that the developed membranes were ideal candidates for H2/CO2 separations, like for example in reforming units of natural gas and biogas (H2/CO2/CO/CH4). Moon et al.[23] have studied the separation characteristics and dynamics of hydrogen mixture produced from natural gas reformer on tubular type methyltriethoxysilane (MTES) silica / ?-alumina composite membranes. The permeation and separation of CO pure gas, H2/CO (50/50 vol. %) binary mixture and H2/CH4/CO/CO2 (69/3/2/26 vol. %) quaternary mixture was investigated. The authors developed a membrane process suitable for separating H2 from CO and other reformate gases (CO2 or CH4) that showed a molecular sieving effect. Since the permeance of pure CO on the MTES membrane was very low (CO  » 4.79 – 6.46 x 10-11 mol m-2 s-1 Pa-1), comparatively high hydrogen selectivity could be obtained from the H2/CO mixture (separation factor: 93 – 110). This meant that CO (which shall be eliminated before entering fuel cell) can be separated from hydrogen mixtures using MTES membranes. The permeance of the hydrogen quaternary mixture on MTES membrane was 2.07 – 3.37 x 10-9 mol m-2 s-1 Pa-1 and the separation factor of H2 / (CO + CH4 + CO2) was 2.61 – 10.33 at 323 – 473 K (Figure 14). The permeation and selectivity of hydrogen were increased with temperature because of activation of H2 molecules and unfavourable conditions for CO2 adsorption. Compared to other impurities, CO was most successfully removed from the H2 mixture. The MTES membranes showed great potential for hydrogen separation from reforming gas with high selectivity and high permeance and therefore they have good potential for fuel cell systems and for use in hydrogen stations. According to the authors, the silica membranes are expected to be used for separating hydrogen in reforming environment at high temperatures. Silica membranes prepared by the CVD or sol-gel methods on mesoporous support are effective for selective hydrogen permeation, however it is known that hydrogen-selective silica materials are not thermally stable at high temperatures. Most researchers reported a loss of permeability of silica membranes even 50 % or greater in the first 12 hours on exposure to moisture at high temperature. Much effort has been spent on the improvement of the stability of silica membranes. Gu et al.[24] have investigated a hydrothermally stable and hydrogen-selective membrane composed of silica and alumina prepared on a macroporous alumina support by CVD in an inert atmosphere at high temperature. Before the deposition of the silica-alumina composite multiple graded layers of alumina were coated on the alumina support with three sols of decreasing particle sizes. The resulting supported composite silica-alumina membrane had high permeability for hydrogen (in the order of 10-7 mol m-2 s-1 Pa-1) at 873 K . Significantly the composite membrane exhibited much higher stability to water vapour at the high temperature of 873 K in comparison to pure silica membranes. The introduction of alumina into silica made the silica structure more stable and slowed down the silica disintegration process. As mentioned, silica membranes produced by sol-gel technique or by CVD applied for gas separation, especially for H2 production are quite stable in dry gases and exhibit high separation ratio, but lose the permeability when used in the steamed gases because of sintering or tightening. Thi Literature Survey on Hydrogen Separation Technique Literature Survey on Hydrogen Separation Technique Literature review has been performed in order to identify recent publications on hydrogen separation methods, hydrogen solubility, materials and concepts in research institutes and laboratories. The aim of the performed literature survey was to monitor recent worldwide literature and find out whether some of the developed and reported solutions might possibly help to improve existing hydrogen separation concept in PDh system, enabling efficient complete separation of hydrogen from all unwanted hydrocarbons. Literature survey on hydrogen separation technique Basically there are four important methods applied to the separation of gases in the industry: absorption, adsorption, cryogenic and membranes. Pressure swing adsorption (PSA) is a gas purification process consisting of the removal of impurities on adsorbent beds. The usual adsorbents and gases adsorbed are molecular sieves for carbon monoxide, activated carbon for CO2, activated alumina or silica gel. Industrial PSA plants consist of up to 12 adsorbers and along with the number of valves required this makes the system rather complicated and complex. The PSA process is usually a repeating sequence of the following steps: adsorption at feed pressure, co-current depressurisation to intermediate pressure, counter-current depressurisation to atmospheric pressure usually starting at 10 % to 70 % of the feed pressure, counter-current purge with hydrogen enriched or product gas at ambient pressure, co-current pressure equalisation and finally, co-current pressurisation with feed or secondary process gas[1]. For hydrogen purification by PSA hydrogen purity is high but the amount of rejected hydrogen is also relatively high (10 †“ 35 %). It seems also that cryogenic technology might not be applicable for PDh process gas separation. Cooling down the mixture will finally end in a solid jet fuel and a gas phase. Handling the solid is more difficult when compared with liquid. During the survey it became evident that membrane technology is the most popular, used and still investigating for the improvement process for hydrogen separation therefore the focus of the study is mainly on this technique. The membrane separation process involves several elementary steps, which include the solution of hydrogen and its diffusion as atomic hydrogen through the membrane bulk material. Nowadays, membrane technologies are becoming more frequently used for separation of wide varying mixtures in the petrochemical related industries. According to Sutherland[2] it is estimated that bulk chemicals and petrochemicals applications represented about 40% of the membrane market in the whole chemicals industry or about $ 1.5 billions, growing over 5 % per year. Membrane gas separation is attractive because of its simplicity and low energy cost. The advantages of using membrane gas separation technologies could be summarized as following: Continuous and clean process, membranes do not require regeneration, unlike the adsorption or the absorption processes, which require regeneration step leading to the use of two solid beds or a solvent regeneration unit. Required filtration system is simple and inexpensive. Compared with conventional techniques, membranes can offer a simple, easy-to-operate, low-maintenance process. Membrane process is simple, generally carried out at atmospheric conditions which, besides being energy efficient, can be important for sensitive applications in pharmaceutical and food industry. The recovery of components from a main stream using membranes can be done without substantial additional energy costs. Membrane is defined essentially as a barrier, which separates two phases and restricts transport of various chemicals in a selective manner. A membrane can be homogenous or heterogeneous, symmetric or asymmetric in structure, solid or liquid; can carry a positive or negative charge or be neutral or bipolar. Transport through a membrane can be affected by convection or by diffusion of individual molecules, induced by an electric field or concentration, pressure or temperature gradient. It takes place when a driving force is applied to the components in the feed. In most of the membrane processes, the driving force is a pressure difference or a concentration (or activity) difference across the membrane. Another driving force in membrane separations is the electrical potential difference. This driving force only influences the transport of charged particles or molecules. The hydrogen separation factor is sometimes used to specify membrane quality. It is defined as following: where ni stands for moles of species i transferred through the membrane and ?pi stands for the partial pressure difference of species i through the membrane. The membrane thickness may vary from as small as 10 microns to few hundred micrometers. Basic types of membranes are presented in Figure 4. Membranes in petrochemical industry are mainly used for concentration, purification and fractionation however they may be coupled to a chemical reaction to shift the chemical equilibrium in a combination defined as a membrane reactor. Using a membrane is adding costs to any process, therefore in order to overcome the cost issue another advantages must overcome the added expenses like material with a very good separation factor, high flux, high quality membrane materials (stable during many months of operation). In a membrane separation reactor both organic and inorganic membranes can be used. Many industrial catalytic processes involve the combination of high temperature and chemically harsh environments favouring therefore inorganic membranes due to their thermal stability, resistance to organic solvents, chlorine and other chemicals. Some promising applications using inorganic membranes include certain dehydrogenation, hydrogenation and oxidation reactions like formation of butane from dehydrogenation of ethyl benzene, styrene production from dehydrogenation of ethyl benzene, dehydrogenation of ethane to ethane, oxidative coupling of methane etc. In membrane reactor two basic concepts can be distinguished as can be seen in Figure 5. reaction and separation combined in one reactor (catalytic membrane reactor) reaction and separation are not combined and the reactants are recycled along a membrane system (membrane recycle reactor) Catalytic membrane reactor concept is used especially with inorganic membranes (ceramics, metals) and polymeric membranes where the catalyst is coupled to the membrane. Membrane recycle reactor can be applied with any membrane process and type of membranes. Most of the chemical reactions need catalyst to enhance the reaction kinetics. The catalyst must be combined with the membrane system and various arrangements are possible, as can be seen in Figure 6. The advantage of the catalyst located inside the bore of the tube is simplicity in preparation and operation. When needed the catalyst could be easily replaced. In case of top layer filled with catalyst and membrane wall, the catalyst is immobilized onto the membrane. Palladium has been known to be a highly hydrogen permeable and selective material since the 19th century. The existing Pd-based membranes can be mainly classified into two types according to the structure of the membrane as (i) self-supporting Pd-based membranes and (ii) composite structures composed of thin Pd-based layers on porous materials. Most self-supporting Pd-based membranes are commercially available in the forms that are easily integrated into a separation setup. However these membranes are relatively thick (50 mm or more) and therefore the hydrogen flux through them is limited. Thick palladium membranes are expensive and rather suitable for use in large scale chemical production. For practical use it is necessary to develop separation units with reduced thickness of the layer. An additional problem is that in order to have adequate mechanical strength, relatively thick porous supports have to be used. In the last decade a significant research has been carried out to achie ve higher fluxes by depositing thin layers of Pd or Pd alloys on porous supports like ceramics or stainless steel. A submicron thick and defect-free palladium-silver (Pd-Ag) alloy membrane was fabricated on a supportive microsieve by using microfabrication technique and tested by Tong et al[4]. The technique also allowed production of a robust wafer-scale membrane module which could be easily inserted into a membrane holder to have gas-tight connections to outside. Fabricated membrane had a great potential for hydrogen purification and in application like dehydrogenation industry. One membrane module was investigated for a period of ca. 1000 hours during which the membrane experienced a change in gas type and its concentration as well as temperature cycling between 20 – 450  °C. The measured results showed no significant reduction in flux or selectivity, suggesting thus very good membrane stability. The authors carried out experiments with varying hydrogen concentration in the feed from 18 to 83 kPa at 450  °C to determine the steps limiting H2 transport rate. It is assumed that the fabricated membrane may be used as a membrane reactor for dehydrogenation reactions to synthesize high value products although its use may be limited due to high pressures of tens of bars. Schematic drawing of the hydrogen separation setup is presented in Figure 7. The membrane module was placed in a stainless steel holder installed in a temperature controlled oven to ensure isothermal operation. The H2/He feed (from 300 to 100 ml/mol) was preheated in spirals placed in the same oven. The setup was running automatically for 24 h/day and could handle 100 recipes without user intervention. Tucho et al.[5] performed microstructural studies of self-supported Pd / 23 wt. % Ag hydrogen separation membranes subjected to different heat treatments (300/400/450  °C for 4 days) and then tested for hydrogen permeation. It was noted that changes in permeability were dependent on the treatment atmosphere and temperature as well as membrane thickness. At higher temperatures significant grain growth was observed and stress relaxation occurred. Nam et al.[6] were able to fabricate a highly stable palladium alloy composite membrane for hydrogen separation on a porous stainless steel support by the vacuum electrodeposition and laminating procedure. The membrane was manufactured without microstructural change therefore it was possible to obtain both high performance (above 3 months of operation) and physical and morphological stability of the membrane. It was observed that the composite membrane had a capability to separate hydrogen from gas mixture with complete hydrogen selectivity and could be used to produce ultra-pure hydrogen for applications in membrane reactor. Tanaka et al.[7] aimed at the improved thermal stability of mesoporous Pd-YSZ-g-Al2O3 composite membrane. The improved thermal stability allowed operation at elevated temperature (> 500  °C for 200 hours). This was probably the result of improved fracture toughness of YSZ-g-Al2O3 layer and matching thermal expansion coefficient between palladium and YSZ. Kuraoka, Zhao and Yazawa[8] demonstrated that pore-filled palladium glass composite membranes for hydrogen separation prepared by electroless plating technique have both higher hydrogen permeance, and better mechanical properties than unsupported Pd films. The same technique was applied by Paglieri et al.[9] for plating a layer of Pd and then copper onto porous ?-substrate. Zahedi et al.[10] developed a thin palladium membrane by depositing Pd onto a tungsten oxide WO3 modified porous stainless steel disc and reported that permeability measureme nts at 723, 773 and 823 K showed high permeability and selectivity for hydrogen. The membrane was stable with regards to hydrogen for about 25 days. Certain effort has been performed for improving hydrothermal stability and application to hydrogen separation membranes at high temperatures. Igi et al.[11] prepared a hydrogen separation microporous membranes with enhanced hydrothermal stability at 500  °C under a steam pressure of 300 kPa. Co-doped silica sol solutions with varying Co composition (Co / (Si + Co) from 10 to 50 mol. %) were prepared and used for manufacturing the membranes. The membranes showed increased hydrothermal stability and high selectivity and permeability towards hydrogen when compared with pure silica membranes. The Co-doped silica membranes with a Co composition of 33 mol. % showed the highest selectivity for hydrogen, with a H2 permeance of 4.00 x 10-6 (m3 (STP) Ãâ€" (m Ãâ€" s Ãâ€" kPa)-1) and a H2/N2 permeance ratio of 730. It was observed that as the Co composition increased as high as 33 %, the activation energy of hydrogen permeation decreased and the H2 permeance increased. Additional increase in Co concentration resulted in increased H2 activation energy and decreased H2 permeance. Due to high permselectivity of Pd membranes, high purity of hydrogen can be obtained directly from hydrogen containing mixture at high temperatures without further purification providing if sufficient pressure gradient is applied. Therefore it is possible to integrate the reforming reaction and the separation step in a single unit. A membrane reformer system is simpler, more compact and more efficient than the conventional PSA system (Pressure Swing Adsorption) because stem reforming reaction of hydrocarbon fuels and hydrogen separation process take place in a single reactor simultaneously and without a separate shift converter and a purification system. Gepert et al.[12] have aimed at development of heat-integrated compact membrane reformer for d ecentralized hydrogen production and worked on composite ceramic capillaries (made of ?-Al2O3) coated with thin palladium membranes for production of CO-free hydrogen for PEM fuel cells by alcohol reforming. The membranes were tested for pure hydrogen and N2 as well as for synthetic reformate gas. The process steps comprised the evaporation and overheating of the water/alcohol feed, water gas shift combined with highly selective hydrogen separation. The authors have focused on the step concerned with the membrane separation of hydrogen from the reforming mixture and on the challenges and requirements of that process. The challenges encountered with the development of capillary Pd membranes were as following: long term temperature and pressure cycling stability in a reformate gas atmosphere, the ability to withstand frequent heating up and cooling down to room temperature, avoidance of the formation of pin-holes during operation and the integration of the membranes into reactor housi ng. It was observed that palladium membranes should not be operated at temperatures below 300  °C and pressures lower than 20 bar, while the upper operating range is between 500 and 900  °C. Alloying the membrane with copper and silver extend their operating temperature down to a room temperature. The introduction of silver into palladium membrane increases the lifetime, but also the costs when compared with copper. Detailed procedure of membrane manufacturing, integration into reformer unit and testing is described by the authors. Schematic of the concept of the integrated reformer is shown in Figure 8. The membrane was integrated in a metal tube embedded in electrically heated copper plates. Before entering the test tube, the gases were preheated to avoid local cooling of the membrane. Single gas measurements with pure N2 and H2 allowed the testing of the general performance of the membrane and the permselectivity for the respective gases to be reached. Synthetic reformate gas consisting of 75 % H2, 23.5 % CO2 and 1.5 % CO was used to get information about the performance. The membranes were tested between 370 – 450  °C and pressures up to 8 bar. The authors concluded that in general the membranes have shown good performance in terms of permeance and permselectivity including operation under reformate gas conditions. However, several problems were indicated concerning long-term stability under real reforming conditions, mainly related to structural nature (combination of different materials: ceramic, glaze, palladium resulted on incoherent potential for causing membrane failure). At operation times up to four weeks the continuous Pd layer remained essentially free from defects and pinholes. Han et al.[13] have developed a membrane separation module for a power equivalent of 10 kWel. A palladium membrane containing 40 wt. % copper and of 25 mm thickness was bonded into a metal frame. The separation module for a capacity of 10 Nm3 h-1 of hydrogen had a diameter of 10.8 cm and a length of 56 cm. Reformate fed to the modules contained 65 vol. % of hydrogen and the hydrogen recovery through the membrane was in the range of 75 %. Stable operation of the membrane separation was achieved for 750 pressure swing tests at 350  °C. The membrane separation device was integrated into a methanol fuel processor. Pientka et al.[14] have utilized a closed-cell polystyrene foam (Ursa XPS NIII, porosity 97 %) as a membrane buffer for separation of (bio)hydrogen. In the foam the cell walls formed a structured complex of membranes. The cells served as pressure containers of separated gases. The foam membrane was able to buffer the difference between the feed injection rate and the rate of consumption of the product. Using the difference in time-lags of different gases in polymeric foam, efficient gas separation was achieved during transient state and high purity hydrogen was obtained. Argonne National Laboratory (ANL) is involved in developing dense hydrogen-permeable membranes for separating hydrogen from mixed gases, particularly product streams during coal gasification and/or methane reforming. Novel cermet (ceramic-metal composite) membranes have been developed. Hydrogen separation with these membranes is non-galvanic (does not use electrodes or external power supply to drive the separation and hydrogen selectivity is nearly 100 % because the membrane contain no interconnected porosity). The membrane development at ANL initially concentrated on a mixed proton/electron conductor based on BaCe0.8Y0.2O3-d (BCY), but it turned to be insufficient to allow high non-galvanic hydrogen flux. To increase the electronic conductivity and thereby to increase the hydrogen flux the development focused on various cermet membranes with 40-50 vol. % of metal or alloy dispersed in the ceramic matrix. Balachandran et al.[15],[16] described the development performed at ANL. The powder mixture for fabricating cermet membranes was prepared by mechanical mixing Pd (50 vol. %) with YSZ, after that the powder mixture was pressed into discs. Polished cermet membranes were affixed to one end of alumina tube using a gold casket for a seal (as can be seen in Figure 9). In order to measure the hydrogen permeation rate, the alumina tube was inserted into a furnace with a sealed membrane and the associated gas flow tubes. Hydrogen permeation rate for Pd/YSZ membranes has been measured as a function of temperature (500-900  °C), partial pressure of hydrogen in the feed stream (0.04-1.0 atm.) and membrane thickness ( » 22-210 mm) as well as versus time during exposure to feed gases containing H2, CO, CO2, CH4 and H2S. The highest hydrogen flux was  » 20.0 cm3 (STP)/min cm2 for  » 22- mm thick membrane at 900  °C using 100 % hydrogen as the feed gas. These results suggested that membranes with thickness In the last decade Matrimid 5218 (Polyimide of 3,3,4,4-benzophenone tetracarboxylic dianhydride and diamino-phenylindane) has attracted a lot of attention as a material for gas separation membranes due to the combination of relatively high gas permeability coefficients and separation factors combined with excellent mechanical properties, solubility in non-hazard organic solvents and commercial availability. Shishatskiy et al.[18] have developed asymmetric flat sheet membranes for hydrogen separation from its mixtures with other gases. The composition and conditions of membrane preparation were optimized for pilot scale membrane production. The resulting membrane had a high hydrogen flux (1 m3 (STP)/m2h*bar) and selectivity of H2/CH4 at least 100, close to the selectivity of Matrimid 5218, material used for asymmetric structure formation. The hydrogen flux through the membranes increased with the decrease of polymer concentration and increase of non-solvent concentration. In addition, the influence of N2 blowing over the membrane surface (0, 2, 3, 4 Nm3 h-1 flow rate) was studied and it was proved that the selectivity of the membrane decreased with increase of the gas flow. The SEM image of the membrane supported by Matrimid 5218 is shown in Figure 10. The stability against hydrocarbons was tested by immersion of the membrane into the mixture of n-pentane/n-hexane/toluene in 1:1:1 ratio. Stability tests showed that the developed membrane was stable against mixtures of liquid hydrocarbons and could withstand continuous heating up to 200  °C for 24 and 120 hours and did not lose gas separation properties after exposure to a mixture of liquid hydrocarbons. The polyester non-woven fabric used as a support for the asymmetric membrane gave to the membrane excellent mechanical properties and allowed to use the membrane in gas separation modules. Interesting report on development of compact hydrogen separation module called MOC (Membrane On Catalyst) with structured Ni-based catalyst for use in the membrane reactor was presented by Kurokawa et al[19]. In the MOC concept a porous support itself had a function of reforming catalyst in addition to the role of membrane support. The integrated structure of support and catalyst made the membrane reformer more compact because the separate catalysts placed around the membrane modules in the conventional membrane reformers could be eliminated. In that idea first a porous catalytic structure 8YSZ (mixture of NiO and 8 mol. % Y2O3-ZrO2 at the weight ratio 60:40) was prepared as the support structure of the hydrogen membrane. The mixture was pressed into a tube closed at one end and sintered then in air. Slurry of 8YSZ was coated on the external surface of the porous support and heat-treated for alloying. Obtained module of size 10 mm outside and 8 mm inside diameter, 100 ~ 300 mm length and the membrane thickness was 7 ~ 20 mm were heated in flowing hydrogen at 600  °C for 3 hours to reduce NiO in the support structure into Ni before use (the porosity of the support after reduction was 43 %). A stainless steel cap and pipe were bonded to the module to introduce H2 into the inside of the tubular module. Figure 11 presents the conceptual structure design of the MOC module as compared with the structure of the conventional membrane reformer. The sample module in the reaction chamber was placed in the furnace and heated at 600  °C, pre-heated hydrogen (or humidified methane) was supplied inside MOC at the pressure of 0.1 MPa and the permeated hydrogen was collected from the outside chamber around the module at ambient pressure. The 100 ~ 300 mm long modules with 10 mm membrane showed hydrogen flux of 30 cm3 per minute per cm2 which was two times higher than the permeability of the conventional modules with palladium based alloy films. Membrane On Catalyst modules have a great potential to be applied to membrane reformer systems. In this concept a porous support itself has a function of reforming catalyst in addition to the role of membrane support. It seems that Membrane On Catalyst modules have a great potential to be applied to membrane reformer systems. Amorphous alloy membranes composed primarily of Ni and early transition metals (ETM) are an inexpensive alternative to Pd-based alloy membranes, and these materials are therefore of particular interest for the large-scale production of hydrogen from carbon-based fuels. Catalytic membrane reactors can produce hydrogen directly from coal-derived synthesis gas at 400 °C, by combining a commercial water-gas shift (WGS) catalyst with a hydrogen-selective membrane. Three main classes of membrane are capable of operating at the high temperatures demanded by existing WGS catalysts: ceramic membranes producing pure hydrogen via ion-transfer mechanism at  ³ 600  °C, alloy membranes which produce pure hydrogen via a solution-diffusion mechanism between 300 – 500  °C and microporous membranes, typically silica or carbon, whose purity depends on the pore size of the membrane and which operate over a wide temperature range dependent on the membrane material. In order to explore the suitability of Ni-based amorphous alloys for this application, the thermal stability and hydrogen permeation characteristics of Ni-ETM amorphous alloy membranes has been examined by Dolan et al[20]. Fundamental limitation of these materials is that hydrogen permeability is inversely proportional to the thermal stability of the alloy. Alloy design is therefore a compromise between hydrogen production rate and durability. Amorphous Ni60Nb(40-x)Zr(x) membranes have been tested at 400 °C in pure hydrogen, and in simulated coal-derived gas streams with high steam, CO and CO2 levels, without severe degradation or corrosion-induced failure. The authors have concluded that Ni-Nb-Zr amorphous alloys are therefore prospective materials for use in a catalytic membrane reactor for coal-derived syngas. Much attention has been given to inorganic materials such as zeolite, silica, zirconia and titania for development of gas- and liquid- separation membranes because they can be utilized under har sh conditions where organic polymer membranes cannot be applied. Silica membranes have been studied extensively for the preparation of various kinds of separation membranes: hydrogen, CO2 and C3 isomers. Kanezeashi[21] have proposed silica networks using an organo-inorganic hybrid alkoxide structure containing the organic groups between two silicon atoms, such as bis(triethoxysilyl)ethane (BTESE) for development of highly permeable hydrogen separation membranes with hydrothermal stability. The concept for improvement of hydrogen permeability of silica membrane was to design a loose-organic-inorganic hybrid silica network using mentioned BTESE (to shift the silica networks to a larger pore size for an increase in H2 permeability). A hybrid silica layer was prepared by coating a silica-zirconia intermediate layer with a BTESE polymer sol followed by drying and calcination at 300 °C in nitrogen. A thin, continuous separation layer of hybrid silica for selective H2 permeation was observed on top of the SiO2-ZrO2 intermediate layer as presented in Figure 12. Hybrid silica membranes showed a very high H2 permeance, ~ 1 order of magnitude higher (~ 10-5 mol m-2 s-1 Pa-1) than previously r eported silica membranes using TEOS (Tetraethoxysilane). The hydrothermal stability of the hybrid silica membranes due to the presence of Si-C-C-Si bonds in the silica networks was also confirmed. Nitodas et al.[22] for the development of composite silica membranes have used the method of chemical vapour deposition (CVD) in the counter current configuration from TEOS and ozone mixtures. The experiments were conducted in a horizontal hot-wall CVD quartz reactor (Figure 13) under controlled temperature conditions (523 – 543 K) and at various reaction times (0 -15 hours) and differential pressures across the substrate sides using two types of substrates: a porous Vycor tube and alumina (g-Al2O3) nanofiltration (NF) tube. The permeance of hydrogen and other gases (He, N2, Ar, CO2) were measured in a home-made apparatus (able to operate under high vacuum conditions 10-3 Torr, feed pressure up to 70 bar) and the separation capability of the composite membranes was determined by calculating the selectivity of hydrogen over He, N2, Ar, CO2. The in-situ monitoring of gas permeance during the CVD development of nanoporous membranes created a tool to detect pore size alterations i n the micro to nanometer scale of thickness. The highest permeance values in both modified and unmodified membranes are observed for H2 and the lowest for CO2. This indicated that the developed membranes were ideal candidates for H2/CO2 separations, like for example in reforming units of natural gas and biogas (H2/CO2/CO/CH4). Moon et al.[23] have studied the separation characteristics and dynamics of hydrogen mixture produced from natural gas reformer on tubular type methyltriethoxysilane (MTES) silica / ?-alumina composite membranes. The permeation and separation of CO pure gas, H2/CO (50/50 vol. %) binary mixture and H2/CH4/CO/CO2 (69/3/2/26 vol. %) quaternary mixture was investigated. The authors developed a membrane process suitable for separating H2 from CO and other reformate gases (CO2 or CH4) that showed a molecular sieving effect. Since the permeance of pure CO on the MTES membrane was very low (CO  » 4.79 – 6.46 x 10-11 mol m-2 s-1 Pa-1), comparatively high hydrogen selectivity could be obtained from the H2/CO mixture (separation factor: 93 – 110). This meant that CO (which shall be eliminated before entering fuel cell) can be separated from hydrogen mixtures using MTES membranes. The permeance of the hydrogen quaternary mixture on MTES membrane was 2.07 – 3.37 x 10-9 mol m-2 s-1 Pa-1 and the separation factor of H2 / (CO + CH4 + CO2) was 2.61 – 10.33 at 323 – 473 K (Figure 14). The permeation and selectivity of hydrogen were increased with temperature because of activation of H2 molecules and unfavourable conditions for CO2 adsorption. Compared to other impurities, CO was most successfully removed from the H2 mixture. The MTES membranes showed great potential for hydrogen separation from reforming gas with high selectivity and high permeance and therefore they have good potential for fuel cell systems and for use in hydrogen stations. According to the authors, the silica membranes are expected to be used for separating hydrogen in reforming environment at high temperatures. Silica membranes prepared by the CVD or sol-gel methods on mesoporous support are effective for selective hydrogen permeation, however it is known that hydrogen-selective silica materials are not thermally stable at high temperatures. Most researchers reported a loss of permeability of silica membranes even 50 % or greater in the first 12 hours on exposure to moisture at high temperature. Much effort has been spent on the improvement of the stability of silica membranes. Gu et al.[24] have investigated a hydrothermally stable and hydrogen-selective membrane composed of silica and alumina prepared on a macroporous alumina support by CVD in an inert atmosphere at high temperature. Before the deposition of the silica-alumina composite multiple graded layers of alumina were coated on the alumina support with three sols of decreasing particle sizes. The resulting supported composite silica-alumina membrane had high permeability for hydrogen (in the order of 10-7 mol m-2 s-1 Pa-1) at 873 K . Significantly the composite membrane exhibited much higher stability to water vapour at the high temperature of 873 K in comparison to pure silica membranes. The introduction of alumina into silica made the silica structure more stable and slowed down the silica disintegration process. As mentioned, silica membranes produced by sol-gel technique or by CVD applied for gas separation, especially for H2 production are quite stable in dry gases and exhibit high separation ratio, but lose the permeability when used in the steamed gases because of sintering or tightening. Thi

Balance in the Administration of Justice Security

Recent American polls have suggested that Americans, in a bid to reducing terrorism threats, do not mind sacrificing some of their freedom. The choices faced are usually two; a free country which is prone to terrorist attacks, and a restricted country that is free from terrorism. These are hard choices to make, especially with the view that no restrictions can guarantee absence of a terrorist attack, they merely reduce the chances of occurrence. Some people see no conflict between security and liberty, and instead view security as a means to liberty.Proper governments use police powers, both military and domestic, to safeguard the liberty of its citizens. According to Coutu (2006), abrogation, cannot however be used to safeguard individual freedom. Governments that use police powers arbitrarily, destroy the values that they are supposed to secure. Before these governments use police powers to place people under surveillance, question them, arrest them, prosecute them, and in internat ional threats, attack enemy countries, they should have comprehensive evidence of threat to the citizens of its country.This principle is used even in times of war, although procedures and standards, of prosecution and evidence may change. For example, if a certain country supports terrorists, the government has the right to screen or ban citizens arriving from that country. During war, the government has also the right to imprison or execute enemy combatants, without public trials. The major bone of contention when balancing the needs of the justice system and the individual rights of the people, is the perception that individual rights have been trampled on, when enforcing security regulations.Such rights as freedom of movement, freedom of expression, and rights of privacy are seen to be curtailed, when enforcing security regulations, such as using torture to obtain information, monitoring phone calls to obtain information, and checking IDs when screening people. These three issue s are analyzed below, including my suggestions, as a justice administrator, on how to deal with them, so as to balance needs of the justice system and the individual rights of the people. Issues involved in regulation of security. Use of torture to obtain informationAccording to Coutu and Simon (2007), torture has long been used as a means of extracting information from suspects or prisoners. In the United States, the US army and the Central Intelligence Agency (CIA) are the most notorious government agents that have been reported to use torture in extracting information. In fact, both of them have courses on torture, in their training manuals. Torture is normally conducted in dark rooms, which have no toilets and windows, and its aim is to threaten the suspect into giving information, due to belief that lack of cooperation will lead to physical and emotional trauma.There have been many instances where the US army has been caught torturing prisoners, the most notable in the Iraqi pr isons, and Guantanamo bay, Cuba. The exposure by the media has however led to decrease in such human rights violations. In instances of war, it is difficult for soldiers to balance between the freedom of a person and security obligations. This is because a war is a life and death situation, and does not allow the leisure of thinking rationally before acting, especially when in a battle scene.However, in case prisoners are captured, in my opinion as a justice administrator, the security obligations should only outweigh individual rights, and allow reasonable level of torture, if either of three conditions are met. The prisoner should have information that is; crucial to saving lives of other people, will help in achievement of the war mission, or will help prevent further destruction of property. As stated above, reasonable level of torture should be used in these circumstances, and it must be carried out in the presence of a qualified physician.In case it is not during a war situati on, my opinion is a fourth condition is introduced; that a court of law should be convinced that there is evidence that suggests, that torture is the only means that can be used to extract that information. Monitoring phone calls to obtain security threats. According to Stephens and Glenn (2006), telephone and wire taps have been used to obtain information, by third parties, for a relatively long time. Its history can be traced to as early as 1890s and has been carried out in the US, under several presidents.Wire tapping has for many years been used to catch spies, or to spy against foreign countries with a view of obtaining strategic information. However, it has taken a different dimension recently, and is largely used to either catch criminals in the act, or to prevent crimes from happening. This involves tapping the telephones that are used or placing bugging devices close to suspects, so that they might capture their conversation. There have been calls for restriction of wire ta ps, since it is seen as violation of the right of privacy.This is especially true because of the tendency of government agents to abuse such powers, and tap phones, even where there is no accompanying evidence to suggest a crime. When deciding on the use of wire taps, it is important to weigh the security of the wider public, against the rights of the individual. In case the security threat outweighs the rights of the individual, wire taps may be used. However, before wire taps are used, in my opinion as a justice administrator, a court of law has to authorize it, and three conditions must be satisfied.The first is that, it should be proved that there is evidence against a suspect that links him or her to committing, or trying to commit a crime. The second is the alleged crime has to be material enough to warrant a wire tap. The third is that there should be no other possible way to link the suspect to the crime, other than use of a wire tap, and that the chances of its success shou ld be reasonably high. In this case, the security of the wider public will have out weighed the individual freedom, and use of phone taps will be reasonable. ID checks in screening peopleSince the September 11, 2001 attacks, there has been increase in checking of IDs, as a preventive measure against criminal activity. IDs are checked when using airlines, checking into hotels, entering a government building and sometimes even entering a hospital. These checks are all aimed at ensuring security prevails, but some people see it as invasion of privacy, and restricting freedom of movement. When trying to balance liberty and security, it is imperative that a cost benefit analysis is done, and benefits of such measures weighed against costs.In this case, checking IDs should have more benefits against costs, but that is not the case. In fact, according to Toner (2002), all the September 11 terrorist attacks were carried out by people with IDs; some were fake, others were genuine. They carri ed them since they expected to be asked for them. IDs are very easily forged, and are readily available; teenagers use them often to enter clubs when they are under-aged. IDs are also useless to check, if there is no accompanying profile; this means merely having an ID of a criminal without knowledge that he or she is one, does not have any benefit.Presence of profiles divides people into two classes; those that fit the profile and are thus screened cautiously, and those who do not fit the profile and are thus not screened very cautiously. This exposes a very dangerous third category of those who are criminals but do not fit the profile. Examples are Timothy McVeigh, the Oklahoma bomber, and John Allen, the Washington sniper. In such circumstances, it is clear that benefits of ID checks are lower than their costs, the cost being intrusion of privacy and freedom of movement.In my opinion as a justice administrator, it is important to cease such checks, since they limit freedom and li berty, without reasonable benefits on security of the wider public. The police should use other approaches such as random checks, which are less predictable than regular checks. Changes in technology and mass communication and effects on justice and security areas. The advent of globalization has turned the world into a global village. According to Waldron (2003), it is possible to carry out business activities, communicate, learn, share ideas, and so much more, with anyone in any part of the world, through the Internet.Mobile phone technology has also made it possible for people in all corners of the world to communicate and interact with one another. This is the reason that e-mails and mobile phones have played an important role in many people's lives. However, criminals have also had access to these forms of communication and interaction, which has presented a danger to the society. Technology has enabled criminals to carry out their activities faster, and with higher precision. Technology has enabled them to communicate faster amongst themselves, and obtain information about their targets.Changes in technology have also been the downfall of criminals. Through use of mobile phones and emails, criminals have left traces of their criminal activities and identities. This is because communication between themselves can be recorded, fingerprints and DNA can be ‘lifted' from crime scenes, and data can be recovered from computers and phones that they use. This has been the key to solving many crimes, since it places the suspects at the crime scene, and may unearth crucial evidence to use in prosecution. This is what investigators have relied on, over the years.New technology has enabled investigators to be able to monitor suspects' movements and communication through ‘bugs' placed on phones that record conversations and cameras that monitor movements of suspects. However, there has been cases where investigators have abused their powers, by illegally l istening to conversations of people, without evidence that they are potential suspects. This is what has been regarded by people as restricting the freedom of privacy. Mass media has played a very important role in highlighting issues regarding to liberty and security of citizens.The media has played a very important role, especially with regards to exposing human rights abuses by US soldiers, both in Iraqi prisons and Guantanamo bay, in Cuba. In both instances, the media exposed torture on unarmed prisoners, and in other cases, on non-combatants. This was previously restricted to the closed walls of prison, but once it was exposed, the abuses had to cease, due to the spotlight on the soldiers. The mass media can thus be said to have played a crucial role in restoring justice, in that respect. ConclusionIt is evident that the balance between individual rights and the administration of security is difficult. This is because some people complain, when administration of security is don e, under the guise of violation of their rights. On the other hand, when crimes are committed, they are the first ones to blame the security agencies. This makes it a very delicate affair and the administrators of justice should ensure that a balance between the two is maintained. This can be done by weighing the benefits of the administration of security to the wider public, against the rights of the individual.If the benefits to the wider public outweigh those of the individual, then the security measures should be performed. Another way of ensuring the balance of security and individual rights, especially during a war situation, is to make sure that the decision to torture someone should be guided by saving of lives, accomplishing of war objectives, or saving of property. However, it should be noted that during war, torture should be done to reasonable levels, and that a qualified physician should be present.In absence of war, torture should be approved by a court of law, after e xamining evidence presented, and ruling that torture is inevitable. In the case of phone taps, this should only be allowed after a court of law weighs evidence produced, and concludes that phone taps are the best way of obtaining evidence against the suspect, under such circumstances. ID checks should only be allowed if done at random, since the criminals do not anticipate them. References. Coutu, M. (2006). The Aftermath of 11 September 2001: Liberty Vs. Security. Washington: OUP. Coutu, N.E. , Simon, R. L. (2007), The Individual and the Political Order: An Introduction to Social and Political Philosophy. New York: Rowman & Littlefield Stephens, O. H. , Glenn, R. A. (2006), Unreasonable Searches and Seizures: Rights and Liberties Under the Law. Chicago: ABC-CLIO. Toner, R. (2002). A nation challenged: The terrorism fight; civil liberty vs security. New York Times. Retrieved on October 23, 2008 from . Waldron, J. (2003). Security and liberty: The image of balance. The Journal of Pol itical Philosophy. Boston: Blackwell Synergy.

Clinical Rotation At St. Anthony Hospital - 995 Words

This clinical rotation differs from my previous OB rotation last semester. I did my OB rotation at St. Anthony Hospital and compared to it, OU Children’s Hospital is different. At St. Anthony, we don’t have much opportunity to see the birth of a baby, but here at the OU Children Hospital, the first thing I walked in is either in the middle of labor or that a labor is about to happen. This may due to the month. I assume that there are more babies born in June than in May. On my first day, my preceptor and I took care of a patient with hematoma as a result from giving birth. This patient lost more than 500cc of blood. We massaged her fundus and straight cath her. Finally, we insert a Foley catheter. At once point, when the midwife checked her and massaged the patient’s fundus, a tennis ball size blood clot flew out of her vagina. I was surprised and amazed. She massaged it again and more blood clots shot out, almost missed the end of the bed and flew to the floor. From this experience, I learned not to stand at the bottom of the bed when someone is giving someone a fundus massage. This is an interesting sight and I would never expect to see something like this to happen. On my second day, the first labor I witnessed took place very fast. The mother doesn’t have to do much pushing and the baby slipped out of her. During this time, the only nurse available is my preceptor. This is not what I expected to happen based on my experience from last semester clinical simulation andShow MoreRelatedPresent Day Robotic Surgery and Beyond8509 Words   |  35 PagesRobotic surgery has been on the rise since its approval in 1997, spreading to hospitals and surgical centers all over the United States and seen Internationally. This increase in technology in the medical field could be either a remarkable change or the medical industries worst â€Å"Terminator† nightmares. 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Film and New York Times - 2217 Words

KPB203 Australia Film Look Both Ways Look Both Ways is an Australian independent movie, written and directed by Sarah Watt. It was shown in 2005. The film was funded by the Adelaide Film Festival fund where it opened (Wikipedia 2005). It is a sucessful movie and has been shown at the Toronto International film festival (Discovery Award). The genre of this movie are drama and comedy. Look Both Ways takes a look into lives of different people drawn together by this tragic accident on the railway tracks. Personal Statement: Look Both Ways is a meaningful movie. It creates animated fatalism in live action. It is an excellent Australian prodution. It creates meanings about death and life. Also, it is showing relationship of families.†¦show more content†¦All the elements are placed in front of the camera to be photographed. There are sets, props and the staging of a scene. (TV and Film language LEC notes week 2. 2005) Motion picture photography Cinematography is a general term for the techniques of motion picture photography. In particular is a sequence of animation and scene combine together. Most of Meryl’s imaginations are in animation to describe the bad things that happen. For example, Meryl gets off the train and walking back to her home. She imagined the train would suddenly drop off, the car would crash on her and the man who was playing with the dog would come to kill her. The animation allows the audience directly sees into her imagination. For the whole film the ending is predicted so the color was dark. It gives the audience a heavy feeling. But at the end, after the rain, the sun comes out. The color changed, the color is bright and hopeful. It shows the kids are jumping and playing with the water on the floor. It has a magic movement where Nick and Meryl see each other again. The animation is mixed amongst the live footage to great effect. It gives the film a real buzz and its particularly graphic nature is both hilarious and disturbing. Editing and Montage Montage refers to a series of successive short shots that are rapidly juxtaposed into a coherent sequence to suggest meaning. The ending sequence: (1:07:31 toShow MoreRelatedAnalysis of Andrew Rossi ´s Documentary Film Page One: Inside the New York Times 548 Words   |  3 Pagesdocumentary film, Page One: Inside the New York Times fits into the finger categories of news media/entertainment and social relationships. The most relevant category is news media/entertainment. The New York Times is the nation’s oldest continually publishing major newspaper. A newspaper is a type of news media, and its goal is to inform the public. The documentary also fits into the category of social relationships. The documentary depicts many relationships that are a part of the New York Times. It showsRead MoreAlfred Hitchcocks Psycho992 Words   |  4 PagesAlfred Hitchcock’s film â€Å"Psycho† created a tremendous impact on 60’s American films. Hitchcock powerfully describes the murder scene of Marion, while taking a shower at Bates Motel. Viewers and critics of the film believe that it is unco nventional and overly violent for young viewers eyes, but some analysts think that it is a form of deconstruction, a new structure of horror film that Hitchcock wants to share. Different perspectives and ideas emerge because of the murder scene in the film, but still, PsychoRead MoreGender Inequality : The Case Of The American Superhero Film Industry1425 Words   |  6 PagesThe Case of the American superhero film industry The American film industry creates gender inequality through its structural components and proliferates it through the generation of character archetypes that assimilate into social norms which appeal to a mass audience. 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In this Journal articles by Anthony Davies, he attempts to trace, compare, and analyze the play of Romeo Juliet’s life throughout cinema. To do this, Anthony does a close reading of four different films directed by Cukor, Zeffirelli, Alvin Rakoff, and the BBC. With these films, Anthony delves into them while dissecting specific scenes to compare how they are different or similar

Essay on The Importance of Holocaust In the Establishment...

The Importance of Holocaust In the Establishment of Israel The holocaust seems to be a major reason in the establishment of the state of Israel. The state of Israel was created in May 1948; the Jews finally had a homeland of their own. There were a variety of long-term causes such as the Balfour Declaration, Zionist movement and short-term causes such as the holocaust and the influence of the USA. The area, which is now called Israel, was part of Palestine; it was under British mandate at the start of World War One. The holocaust is a term used to define the systematic killing of over 6 million Jews by the Nazi regime from the years 1933 to 1945. It took place in Nazi occupied territories,†¦show more content†¦The McDonald White Paper was a document that set limitations to the number of Jews allowed to immigrate into Palestine. Another cause for the creation of Israel was a promise made by Britain to the Jews, called the Balfour Declaration. However this was not the only promise that Britain made concerning Palestine during this period of time in history. The Balfour declaration stated that if the Jews were to help support Britain during the First World War, Britain would create a homeland in Palestine for the Jews once the war ended. However Britain at the same time also made promises to the Arabs living in the Palestine region that they would give up control over Palestine to the Arabs, and let them govern their own nation-state on the condition that the Arabs revolted and attacked the Turkish Ottoman empire which had aligned itself with Nazi Germany. On top of these agreements Britain also committed itself to a third agreement, these was the Picot/Sykes agreement which stated that Britain and France would divide up Palestine between themselves and disregard the calls to create nation-states for the Je ws or the Arabs. The Balfour agreement put pressure on Britain to carry out their promises. However it would be extremely different for Britain to give the Jews what they had been promised because of the promises they had made to others. Another causeShow MoreRelatedUnintended Consequences - Israel from Palestine1297 Words   |  6 PagesPity from the Holocaust A common argument for the Holocaust’s causation in the creation of Israel and generous partition of Palestine is the potential for nations to pity the Jews for their suffering. In truth, Zionism wasn’t offered any gains by the Holocaust. Not only was the genocide irrelevant to the argument of Zionism to the rest of the world, but it also couldn’t be pitied, as it was not yet understood. Overall, the Palestine question – and it was just that: a question regarding PalestineRead MoreArab Israeli Conflict 883 Words   |  4 PagesMcMahon promised British support in the establishment of an independent Arab state if the Arabs helped Britain overthrow the Ottoman Empire (which was aligned with Germany). 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Cultural Comparison Free Essays

string(66) " my own heritage and how it contributed to the person I am today\." I have chosen three stories of women growing up in relationship to thtime period in which they lived, their ethnicity,the customs of their countries and how they attempted to handle their life situations. Child f the Americas by Aurora Morales, gives us a view of a woman who is happy with herself and adjusts well to her life. The second is What It’s Like to be a Black Girl by Patricia Smith, a story of transition from childhood to adulthood for a young black girl having problems with both growing up and her place as a black woman in society. We will write a custom essay sample on Cultural Comparison or any similar topic only for you Order Now The third Country Lovers by Nadine Gordimer is the story of growing up in South Africa as a repressed young black woman. Child of the Americas by Aurora Morales, is tribute to her multiple identity. The word diasposa is the perfect description of her heritage. It means the scattering of a people from their ancestral home . She is a descendent of Latin American, Jewish, Aftican and North American heritage and she describes herself as saying she is none of these things outwardly, they are within her (Clugston).. This collage of nationalities forms the theme of this poem. The tone of She clearly knows who she is and is proud of the fact that she is confident. The tone of this poem is upbeat and is developed in this upbeat manner. She is different and likes being different. She realizes her inherited background has a dark side, ghettoes I have never seen citation . Even her use of symbolism,† I speak English with passion: it’s the tongue of my consciousness, a flashing knife blade of cristal, my tool, my craft. Shows pride in who she is. The setting of this story is important. She is a U. S. American who could have been born in any of the other countries of their heritage. This is a story of self discovery and it is obvious she likes what she sees. †¢What it is like to be a black girl in in fact the opposite of Child of the Americas. She is a young black girl, who discovers she is growing up. She talks about being nine and feeling like she al right and too add to this she had the problem of a racially prejudice society. She hopes for something better to come in her life She wishes to be whilte, putting food coloring in her eyes to try to change them and a white mophead on her head over her hair. She wanted to grow into a more accepted form. She used other ways to tell how she wanted to grow into something different, She was having trouble grownng up with issusess that did not include the racial issue.. It is an insiers view into a young black girl’s transition into black woman-hood at a time where both being a black girl and a black woman was not as welcomed It discusses the conflict she has between being a little girl â€Å"jumping double Dutch until your legs pop† and â€Å"growing tall it talks about when she marries and becomes submissive to a ma as women did in her era. In comparison to Child of the Americas, the feeling or tone of the story is in complete opposition to the bouncy, girl, proud of her heritage l I have n ow covered two different heritages, one who is proud of her heritage and it is apparent that she looks forward to her future. The second is of the transition of a woman who is not sure of her future in relationship to her heritage. The third story begins as a mellow story of two young people who grow up together discover each other, but apparently the girl has no future, other than the one in which she is destined to live the rest of her life. The tone of this story becomes dark and hard as the young woman realizes she has no future and no control of her future. The characters and their background are important in each of these three stories. In all three stories, the character and their reaction to their ethnicity in relationship to how they feel about themselves is the key point of each story. Their reactions range from feeling good about themselves, vibrant and alive to feeling that they had a set pattern in life and had to learn to grow up and live it, to feeling as if they are of no importance to anyone at all. The theme of these three stories appears to be intertwined. The reasoning for these themes are not the same, but they are related. They all include learning to live with yourself and your conditions in relationship to your cultural background, your area in which you live , your own internal feelings and the feelings of others toward you. In each story, the situations were handled differently The character in Child of the Americas is adjusted to the fact that she is unique and is proud of herself. The character in Country Lovers has made mistakes in her life, adjusted to limitations in life and is simply trying to live life in the only way she knows how to survive. The theme is What its like to grow up black, has a less apparent theme than the other two. It appears to consider how hard it is to grow up at all, much less during the time period a transition in the place of the people of her heritage in the world. The main theme of these three stories is that we need to be honest with ourselves and live life in the best way we can The tone of each story differs but each added to the individual reading of these tories. The Child of the Americas was an upbeat reading to begin with and was reflected in the tone. It made me think of my own heritage and how it contributed to the person I am today. You read "Cultural Comparison" in category "Papers" The tone of What is like to grow up black had a tone that suggested a little sadness and confusion. The tone made me reflect onmy own chi ldhood. I could empathize with the confusion of childhood. I was growing up in the 1960’s and though my ethnic backround is different, each of us in that era we were both women and had decisions to make about our future. Our character seemed to think her future was marriage. The third character was growing up in South /Africa during a time of race oppression compared to the United States slavery times, so the theme appeared to be quite different from the theme of the first two stories. It used childhood innocence and exploration and added the forbidden dimension of separation of races to form her childhood and rise into adulthood, In conclusion, the tone of each story differed but all three ended with the characters knowing where they belonged in the world. The historical aspect of each story played an important part of each story. Looking at each author’s background their other writings helps us to understand the reasoning behind each story. Our textbook tells us that Nadine Gordimer was born and raised in South Africa and has lived there all her life except for a year spent at college. Her writing reflects her strong opposition to apartheid which oppressed the black population of South Africa for almost fifty years,, ending in 1994, Apartheid was a socioeconomic system that managed to oppress the black population though they were in the majority of South African people. Many of her works talked about patricia smith is a modern poet known for slam poetry. It is said she speaks for the foices of thoe who have not been heard. Her poetry includes stories of mothers of murdered black youths, the undertakers who try to patch up the bodies, the skinheads whose hate twists America in a knotl Born raised and beginning work as a columinist for Chicago Tribune, she transplanted to New England where she became a columnist for the Boston Globe. She told the same stories using the same techniques and gave birth to slam poetry, using real issues and slamming the point home. In this capacity she lost her credibility when it was discovered that many of her stories written in newspapers as facts, were in fact not true stories. It cost her her career, her marriage and the Pulitzer prize. She has recovered from these downfalls and continues to write and perform slam poetry. http://www. english. illinois. edu/maps/poets/s_z/p_smith/p_smith. htm Aurora Morales, author of Child of the Americas was born in Puerto Rico, the child of a Puerto Rican mother and Jewish father. She moved to the United States in 1967 and has proven herself to be a social activist, concerened with issues of third world people, especially women. She uses her Puerto Rican heritage to identify on a global perspective. Her work discusses sesual abuse racial discrimination and such far ranging topicsa as ecology and social justice. She along with many other women of color who are writers in the U. S, stry to stress the importance of female ethnic heritage in relationship to the development of a feminine voice. She authored her first book, her most important and acclaimed one with her mother. It was a common project in which both of them fouond peace and refuge against discrimination and oppression in writing about themes using their Puerto Rican identity, expressing opinions of third world feminism, , womens relationships and self discovery through a past heritage. It was through this writing that Child of the Americas was born. She and her mother feel that diversity is a source of pawe and home is everywhere. At present she and her mother are attempting to tell the history of peurto Rio through womens ancestor’s who have been silenced. It is unusual work, mixing history of oppressed women with medicinal herb remedies. The two women feel tht reliving and opening up old painful wounds of wimen’s mistreatment is a way of cleansing and healing the past. http://www. uhu. es/antonia. dominguez/pricans/aurora_levins_morales. htm The varied backgrounds of these three women come together to make them writers who write about oppressed and downtrodden peoples. Each in their real lives has worked to correct these problems/ The time line of the history of these three authors has also influenced the historical aspecof each piece of work. They were acve in the 1960’s in which lay the most influencial racial issues of modern day. Apathaid oin south Africa was inforced and Apartheid was begun as a result of greed for the diamonds of South Africa. To insure that the smallest amount of people would have the rights, certain laws were enabled. In 1948 laws that were enacted that pertained to every aspect of social life. From the ability for interracial marriage to the instillation of white only jobs. This discrimination included naming people by their color, their parents color. The black, white, or other nationality were the only ones accepted. If one was considered black. He had to carry a pass at all times, that even included his fingerprints. These were the conditions that were in affect during the writing of Country Lovers. http://www. hoover. org/publications/hoover-digest/by-topic/1076 The civil rights movement occurred between 1955 and 1968, /the movement mainly wanted to abolish discrimination toward African Americans. It began in the south where whites were segregated from blacks. These people were treated ruely because of their color and everything from transportation to the use of public drinking fountains was affected. Now famous black Americans such as rosa parks and martin luthor king took up the causedelivering speeches, making people aware of the unjustice There were deaths including Martin Luthor King but eventually the Civil Rights Act was signed by President Johnson in 1964. All of these discrimination acts occurred during the time all three authors were writing, so it is quite logical that their work would be filled with reference to the unjustice off treatment of the black race in their writings. I feel the similarities of these three stories comes within the plot. I feel these stories were written to make people aware of the pastplight of black women and as Aurora Morales has done publicly, keep a record of their heritage of this injustice. The p lot is as simple as helping a woman rise above injustice. To bring these three stories together. Their similarities far outweigh their difference. They were historically written in a time of injustice for the black race. The tone of each story reflects the attitude of each woman in relationship to her race. References Anonymous (2011) http://www.hoover.org/publications/hoover-digest/by-topic/1076 morales (2010) http://www.uhu.es/antonia.dominguez/pricans/aurora_levins_morales.htm Smith P. (2007) http://www.english.illinois.edu/maps/poets/s_z/p_smith/p_smith.htm Anonymous (2009) http://learningzoneclass.com/aoat11/cayco/history.html Anonymous (2001) http://scholar.library.miami.edu/sixties/urbanRiots.php How to cite Cultural Comparison, Papers

MARINO FALIERO Argumentative Essay Example For Students

MARINO FALIERO Argumentative Essay A monologue from the play by Lord Byron NOTE: This monologue is reprinted from Lord Byron: Six Plays. Lord Byron. Los Angeles: Black Box Press, 2007. ANGIOLINA: Sage Benintende, now chief Judge of Venice,I speak to thee in answer to yon Signor.Inform the ribald Steno, that his wordsNeer weighed in mind with Loredanos daughter,Further than to create a moments pityFor such as he is: would that others hadDespised him as I pity! I preferMy honour to a thousand lives, could suchBe multiplied in mine, but would not haveA single life of others lost for thatWhich nothing human can impugn—the senseOf Virtue, looking not to what is calledA good name for reward, but to itself.To me the scorners words were as the windUnto the rock: but as there are—alas!Spirits more sensitive, on which such thingsLight as the Whirlwind on the waters; soulsTo whom Dishonours shadow is a substanceMore terrible than Death, here and hereafter;Men whose vice is to start at Vices scoffing,And who, though proof against all blandishmentsOf pleasure, and all pangs of Pain, are feebleWhen the proud name on which they pinnacledTheir hopes is breathed on, j ealous as the eagleOf her high aiery; let what we nowBehold, and feel, and suffer, be a lessonTo wretches how they tamper in their spleenWith beings of a higher order. InsectsHave made the lion mad ere now; a shaftI the heel oerthrew the bravest of the brave;A wifes Dishonour was the bane of Troy;A wifes Dishonour unkinged Rome for ever;An injured husband brought the Gauls to Clusium,And thence to Rome, which perished for a time;An obscene gesture cost CaligulaHis life, while Earth yet bore his cruelties;A virgins wrong made Spain a Moorish province;And Stenos lie, couched in two worthless lines,Hath decimated Venice, put in perilA Senate which hath stood eight hundred years,Discrowned a Prince, cut off his crownless head,And forged new fetters for a groaning people!Let the poor wretch, like to the courtesanWho fired Persepolis, be proud of this,If it so please him—twere a pride fit for him!But let him not insult the last hours ofHim, who, whateer he now is, was a Hero,By the intrusion of his very prayers;Nothing of good can come from such a source,Nor would we aught with him, nor now, nor ever:We leave him to himself, that lowest depthOf human baseness. Pardon is for men,And not for reptiles—we have none for Steno,And no resentment: things like him must sting,And higher beings suffer; tis the charterOf Life. The man who dies by the adders fangMay have the crawler crushed, but feels no anger:Twas the worms nature; and some men are wormsIn soul, more than the living things of tombs.