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Hideto Matsuyama - One of the best experts on this subject based on the ideXlab platform.
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improvements in the co2 permeation selectivities of amino acid ionic liquid based Facilitated Transport membranes by controlling their gas absorption properties
Journal of Membrane Science, 2014Co-Authors: Shohei Kasahara, Eiji Kamio, Hideto MatsuyamaAbstract:A series of amino acid ionic liquids (AAILs) composed of different cations of different sizes, including trihexyl(tetradecyl)phosphonium glycinate, tetrabutylphosphonium glycinate and triethyl(pentyl)phosphonium glycinate have been synthesized for the carrier of CO2 Facilitated Transport membrane. Their physical properties, including their viscosity, density, molar volume and N2 absorption amount were investigated. The amount of N2 absorption decreased as the size of the cation of the AAIL decreased. Facilitated Transport membranes containing these AAILs were prepared, and their CO2 and N2 permeabilities were measured. The N2 permeabilities were systematically investigated both experimentally and theoretically with the aim of improving the selectivity of the CO2 permeation of the AAIL-based Facilitated Transport membrane. As expected, the CO2 permselectivity was improved using triethyl(pentyl)phosphonium glycinate, which contained the smallest cation of the AAILs investigated in this study. We have proposed a methodology for improving the CO2 selectivity of AAIL-based Facilitated Transport membranes based on reducing their N2 permeabilities.
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Fundamental Investigation of the Factors Controlling the CO2 Permeability of Facilitated Transport Membranes Containing Amine-Functionalized Task-Specific Ionic Liquids
Industrial & Engineering Chemistry Research, 2014Co-Authors: Shohei Kasahara, Eiji Kamio, Akihito Otani, Hideto MatsuyamaAbstract:Task-specific ionic liquid (IL)-based Facilitated Transport membranes were prepared with tetrabutylphosphonium amine-functionalized glycinate or 2-cyanopyrrolide ILs. CO2 permeabilities and viscosity and CO2 absorbance of ILs were evaluated. Viscosities of glycinate- or methylglycinate-containing ILs drastically increased with CO2 absorption, probably from hydrogen bonding between their CO2 complexes. The temperature dependence of the CO2 permeability of the IL-based membranes was opposite to that of the viscosity of the corresponding ILs. The CO2 permeability at low temperature under dry conditions was improved by using tetrabutylphosphonium 2-cyanopyrrolide, which barely forms hydrogen bonds among its CO2 complexes. However, above 363 K, the tetrabutylphosphonium 2-cyanopyrrolide-based membrane had a lower CO2 permeability than the tetrabutylphosphonium glycinate-based membrane because tetrabutylphosphonium 2-cyanopyrrolide absorbed less CO2. The major factors controlling CO2 permeability of task-specif...
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a Facilitated Transport ion gel membrane for propylene propane separation using silver ion as a carrier
Journal of Membrane Science, 2013Co-Authors: Shohei Kasahara, Eiji Kamio, Reiko Minami, Hideto MatsuyamaAbstract:Abstract Facilitated Transport membranes are effective for gas separations but they have some disadvantages, such as leakage of the carrier solution under pressure and volatilization of solvents from the membrane. In this study, a novel gas separation membrane, a Facilitated Transport ion-gel membrane, with high permselectivity, high stability and high pressure tolerance was fabricated using a gelled ionic liquid with a selective-Transport carrier for the target gas. Imidazolium type-ionic liquids, silver salts, and low molecular weight gelators were used to fabricate the ion-gel membrane. Gas absorption isotherms of the ion-gels were measured and studied using a theoretical model considering both physical and chemical absorption. It was found during absorption tests that some gelators deactivated the function of silver ions as a propylene carrier. In addition, gas permeation through ion-gel membranes was analyzed by applying an absorption model that accounted for the decrease in diffusivity caused by gelation of the ionic liquid. Theoretical analysis indicated that the fabricated ion-gel membranes Transported propylene via a Facilitated Transport mechanism and thus Facilitated Transport ion-gel membranes were successfully fabricated. This is the first report describing the fabrication of Facilitated Transport ion-gel membranes.
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Effect of water in ionic liquids on CO2 permeability in amino acid ionic liquid-based Facilitated Transport membranes
Journal of Membrane Science, 2012Co-Authors: Shohei Kasahara, Eiji Kamio, Toru Ishigami, Hideto MatsuyamaAbstract:Abstract Amino acid ionic liquid-based Facilitated Transport membranes with tetrabutylphosphonium amino acid ionic liquids with glycine, alanine, proline and serine as the anion were prepared and their CO 2 permeation properties were evaluated from the physical and physicochemical properties of the amino acid ionic liquids. A tetrabutylphosphonium proline-based Facilitated Transport membrane showed an excellent CO 2 permeability of 14,000 Barrer, twice that of the others investigated, and a CO 2 /N 2 selectivity of 100 at 373 K under dry conditions. Thermogravimetric measurement showed that the tetrabutylphosphonium proline had a relatively high water-holding ability compared with the other amino acid ionic liquids investigated. The strong water holding ability of tetrabutylphosphonium proline realized the large absorption amount of CO 2 and established a large concentration gradient for the CO 2 -complex across the membrane. The large concentration gradient provided a large driving force for CO 2 -complex Transport through the membrane and increased CO 2 permeability.
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selective separation of co2 by using novel Facilitated Transport membrane at elevated temperatures and pressures
Journal of Membrane Science, 2007Co-Authors: Reza Yegani, Osamu Okada, Masaaki Teramoto, Norifumi Matsumiya, H Hirozawa, Hiroaki Himei, Teiji Takigawa, Naoto Ohmura, Hideto MatsuyamaAbstract:Abstract A novel Facilitated Transport membrane consisting of 2,3-diaminopropionic acid (DAPA) as a selective carrier of CO 2 and PVA/PAA gel as support was developed for the removal of CO 2 from the water gas shift reactor in the hydrogen production plants. The membrane performance was tested by the experiments on the selective separation of CO 2 from a mixture of 3.65% CO 2 , 32.9% N 2 and 63.5% H 2 O at the temperature from 125 to 160 °C and the feed gas pressure from 100 to 650 kPa. Typical observed CO 2 permeances were 3.14 × 10 −4 mol/m 2 s kPa at 125 °C and 300 kPa, 1.71 × 10 −4 at 140 °C and the feed gas pressure of 450 kPa and 1.10 × 10 −4 at 160 °C and 600 kPa, and the CO 2 /H 2 selectivities at the respective conditions were 1070, 561 and 432, respectively. Obtained results showed that the water content in the membrane is one of the key factors, which determines the CO 2 permeance and CO 2 /N 2 selectivity. The CO 2 permeance as well as the CO 2 /N 2 selectivity increased with increasing the pressure, which might be mainly caused by increasing the water content in the membrane. It was also found that increasing the carrier concentration could significantly enhance the membrane performance, especially at elevated temperatures.
Shohei Kasahara - One of the best experts on this subject based on the ideXlab platform.
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improvements in the co2 permeation selectivities of amino acid ionic liquid based Facilitated Transport membranes by controlling their gas absorption properties
Journal of Membrane Science, 2014Co-Authors: Shohei Kasahara, Eiji Kamio, Hideto MatsuyamaAbstract:A series of amino acid ionic liquids (AAILs) composed of different cations of different sizes, including trihexyl(tetradecyl)phosphonium glycinate, tetrabutylphosphonium glycinate and triethyl(pentyl)phosphonium glycinate have been synthesized for the carrier of CO2 Facilitated Transport membrane. Their physical properties, including their viscosity, density, molar volume and N2 absorption amount were investigated. The amount of N2 absorption decreased as the size of the cation of the AAIL decreased. Facilitated Transport membranes containing these AAILs were prepared, and their CO2 and N2 permeabilities were measured. The N2 permeabilities were systematically investigated both experimentally and theoretically with the aim of improving the selectivity of the CO2 permeation of the AAIL-based Facilitated Transport membrane. As expected, the CO2 permselectivity was improved using triethyl(pentyl)phosphonium glycinate, which contained the smallest cation of the AAILs investigated in this study. We have proposed a methodology for improving the CO2 selectivity of AAIL-based Facilitated Transport membranes based on reducing their N2 permeabilities.
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Fundamental Investigation of the Factors Controlling the CO2 Permeability of Facilitated Transport Membranes Containing Amine-Functionalized Task-Specific Ionic Liquids
Industrial & Engineering Chemistry Research, 2014Co-Authors: Shohei Kasahara, Eiji Kamio, Akihito Otani, Hideto MatsuyamaAbstract:Task-specific ionic liquid (IL)-based Facilitated Transport membranes were prepared with tetrabutylphosphonium amine-functionalized glycinate or 2-cyanopyrrolide ILs. CO2 permeabilities and viscosity and CO2 absorbance of ILs were evaluated. Viscosities of glycinate- or methylglycinate-containing ILs drastically increased with CO2 absorption, probably from hydrogen bonding between their CO2 complexes. The temperature dependence of the CO2 permeability of the IL-based membranes was opposite to that of the viscosity of the corresponding ILs. The CO2 permeability at low temperature under dry conditions was improved by using tetrabutylphosphonium 2-cyanopyrrolide, which barely forms hydrogen bonds among its CO2 complexes. However, above 363 K, the tetrabutylphosphonium 2-cyanopyrrolide-based membrane had a lower CO2 permeability than the tetrabutylphosphonium glycinate-based membrane because tetrabutylphosphonium 2-cyanopyrrolide absorbed less CO2. The major factors controlling CO2 permeability of task-specif...
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a Facilitated Transport ion gel membrane for propylene propane separation using silver ion as a carrier
Journal of Membrane Science, 2013Co-Authors: Shohei Kasahara, Eiji Kamio, Reiko Minami, Hideto MatsuyamaAbstract:Abstract Facilitated Transport membranes are effective for gas separations but they have some disadvantages, such as leakage of the carrier solution under pressure and volatilization of solvents from the membrane. In this study, a novel gas separation membrane, a Facilitated Transport ion-gel membrane, with high permselectivity, high stability and high pressure tolerance was fabricated using a gelled ionic liquid with a selective-Transport carrier for the target gas. Imidazolium type-ionic liquids, silver salts, and low molecular weight gelators were used to fabricate the ion-gel membrane. Gas absorption isotherms of the ion-gels were measured and studied using a theoretical model considering both physical and chemical absorption. It was found during absorption tests that some gelators deactivated the function of silver ions as a propylene carrier. In addition, gas permeation through ion-gel membranes was analyzed by applying an absorption model that accounted for the decrease in diffusivity caused by gelation of the ionic liquid. Theoretical analysis indicated that the fabricated ion-gel membranes Transported propylene via a Facilitated Transport mechanism and thus Facilitated Transport ion-gel membranes were successfully fabricated. This is the first report describing the fabrication of Facilitated Transport ion-gel membranes.
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Effect of water in ionic liquids on CO2 permeability in amino acid ionic liquid-based Facilitated Transport membranes
Journal of Membrane Science, 2012Co-Authors: Shohei Kasahara, Eiji Kamio, Toru Ishigami, Hideto MatsuyamaAbstract:Abstract Amino acid ionic liquid-based Facilitated Transport membranes with tetrabutylphosphonium amino acid ionic liquids with glycine, alanine, proline and serine as the anion were prepared and their CO 2 permeation properties were evaluated from the physical and physicochemical properties of the amino acid ionic liquids. A tetrabutylphosphonium proline-based Facilitated Transport membrane showed an excellent CO 2 permeability of 14,000 Barrer, twice that of the others investigated, and a CO 2 /N 2 selectivity of 100 at 373 K under dry conditions. Thermogravimetric measurement showed that the tetrabutylphosphonium proline had a relatively high water-holding ability compared with the other amino acid ionic liquids investigated. The strong water holding ability of tetrabutylphosphonium proline realized the large absorption amount of CO 2 and established a large concentration gradient for the CO 2 -complex across the membrane. The large concentration gradient provided a large driving force for CO 2 -complex Transport through the membrane and increased CO 2 permeability.
Mustafa Ersoz - One of the best experts on this subject based on the ideXlab platform.
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Facilitated Transport of cr vi through a novel activated composite membrane containing cyanex 923 as a carrier
Journal of Membrane Science, 2009Co-Authors: Gulsin Arslan, Yunus Cengeloglu, Ali Tor, Ilker Akin, Harun Muslu, Mustafa Ozmen, Mustafa ErsozAbstract:Abstract This paper describes the Facilitated Transport of Cr(VI) through a novel Activated Composite Membrane (ACM) containing Cyanex 923 as a carrier. The ACM was prepared by immobilization of the Cyanex 923 on a polysulfone support by means of interfacial polymerisation. The prepared ACM was characterized by using scanning electron microscopy (SEM) and atomic force microscopy (AFM) techniques and contact angle measurements. The effect of feed phase composition, carrier concentration of the casting solution and stripping phase composition on the Transport of Cr(VI) was investigated. When the feed phase contained 1 × 10 −3 M Cr(VI) at pH 1.0, 99% of Cr(VI) was Transported through the ACM (prepared with 3% carrier solution) by using 1 M NaOH as a stripping phase. Furthermore, Cr(VI) was preferably Transported in the presence of various metal ions (i.e., Cr(III), Ni(II), Cu(II), Zn(II), Cd(II), Co(II), etc.) and sulphate and nitrate ions had no negative effect on the Transport of Cr(VI). The results also showed that Transport efficiency of the ACM was reproducible and it could be efficiently used in the long-term separation processes instead of supported liquid membrane (SLM).
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Facilitated Transport of cr iii through activated composite membrane containing di 2 ethylhexyl phosphoric acid dehpa as carrier agent
Journal of Hazardous Materials, 2009Co-Authors: Gulsin Arslan, Yunus Cengeloglu, Mustafa ErsozAbstract:Abstract The Facilitated Transport of chromium(III) through activated composite membrane (ACM) containing di-(2-ethylhexyl) phosphoric acid (DEHPA) was investigated. DEHPA was immobilised by interfacial polymerisation on polysulfone layer which was deposited on non-woven fabric by using spin coater. Then, ACM was characterised by using scanning electron microscopy (SEM), contact angle measurements and atomic force microscopy (AFM). Initially, batch experiments of liquid–liquid distribution of Cr(III) and the extractant (DEHPA) were carried out to determine the appropriate pH of the feed phase and the results showed that maximum extraction of Cr(III) was achieved at a pH of 4. It was also found that Cr(III) and DEHPA reacted in 1/1 molar ratio. The effects of Cr(III) (in feed phase), HCl (in stripping phase) and DEHPA (in ACM) concentrations were investigated. DEHPA concentration varies from 0.1 to 1.0 M and it was determined that the Transport of Cr(III) increased with the carrier concentration up to 0.8 M. It was also observed that the Transport of Cr(III) through the ACM tended to increase with Cr(III) and HCl concentrations. The stability of ACM was also confirmed with replicate experiments.
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Facilitated Transport of cr iii through activated composite membrane containing di 2 ethylhexyl phosphoric acid dehpa as carrier agent
Journal of Hazardous Materials, 2009Co-Authors: Gulsin Arslan, Yunus Cengeloglu, Mustafa ErsozAbstract:Abstract The Facilitated Transport of chromium(III) through activated composite membrane (ACM) containing di-(2-ethylhexyl) phosphoric acid (DEHPA) was investigated. DEHPA was immobilised by interfacial polymerisation on polysulfone layer which was deposited on non-woven fabric by using spin coater. Then, ACM was characterised by using scanning electron microscopy (SEM), contact angle measurements and atomic force microscopy (AFM). Initially, batch experiments of liquid–liquid distribution of Cr(III) and the extractant (DEHPA) were carried out to determine the appropriate pH of the feed phase and the results showed that maximum extraction of Cr(III) was achieved at a pH of 4. It was also found that Cr(III) and DEHPA reacted in 1/1 molar ratio. The effects of Cr(III) (in feed phase), HCl (in stripping phase) and DEHPA (in ACM) concentrations were investigated. DEHPA concentration varies from 0.1 to 1.0 M and it was determined that the Transport of Cr(III) increased with the carrier concentration up to 0.8 M. It was also observed that the Transport of Cr(III) through the ACM tended to increase with Cr(III) and HCl concentrations. The stability of ACM was also confirmed with replicate experiments.
Masaaki Teramoto - One of the best experts on this subject based on the ideXlab platform.
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selective separation of co2 by using novel Facilitated Transport membrane at elevated temperatures and pressures
Journal of Membrane Science, 2007Co-Authors: Reza Yegani, Osamu Okada, Masaaki Teramoto, Norifumi Matsumiya, H Hirozawa, Hiroaki Himei, Teiji Takigawa, Naoto Ohmura, Hideto MatsuyamaAbstract:Abstract A novel Facilitated Transport membrane consisting of 2,3-diaminopropionic acid (DAPA) as a selective carrier of CO 2 and PVA/PAA gel as support was developed for the removal of CO 2 from the water gas shift reactor in the hydrogen production plants. The membrane performance was tested by the experiments on the selective separation of CO 2 from a mixture of 3.65% CO 2 , 32.9% N 2 and 63.5% H 2 O at the temperature from 125 to 160 °C and the feed gas pressure from 100 to 650 kPa. Typical observed CO 2 permeances were 3.14 × 10 −4 mol/m 2 s kPa at 125 °C and 300 kPa, 1.71 × 10 −4 at 140 °C and the feed gas pressure of 450 kPa and 1.10 × 10 −4 at 160 °C and 600 kPa, and the CO 2 /H 2 selectivities at the respective conditions were 1070, 561 and 432, respectively. Obtained results showed that the water content in the membrane is one of the key factors, which determines the CO 2 permeance and CO 2 /N 2 selectivity. The CO 2 permeance as well as the CO 2 /N 2 selectivity increased with increasing the pressure, which might be mainly caused by increasing the water content in the membrane. It was also found that increasing the carrier concentration could significantly enhance the membrane performance, especially at elevated temperatures.
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Evaluation of energy consumption for separation of CO2 in flue gas by hollow fiber Facilitated Transport membrane module with permeation of amine solution
Separation and Purification Technology, 2005Co-Authors: Norifumi Matsumiya, Masaaki Teramoto, Satoshi Kitada, Hideto MatsuyamaAbstract:Abstract Energy consumption for the separation of CO 2 in flue gas by a novel hollow fiber Facilitated Transport membrane module was evaluated and compared with those by conventional separation processes such as gas absorption and polymeric membrane separation. In the novel Facilitated Transport membrane system, both a feed gas (CO 2 /N 2 mixture) and a carrier solution (aqueous diethanolamine solution) are supplied to the lumen side (feed side, high pressure side) of the hollow fiber ultrafiltration membrane module and flow upward. The carrier solution, which contains dissolved solute gas, CO 2 in the present case, permeates the membrane to the permeate side (low pressure side, shell side), where the solution liberates dissolved gas to become a lean solution and the lean solution is returned to the lumen side by a pump. The feed side pressure was atmospheric and the permeate side pressure was controlled in the range from 10 to 27 kPa. CO 2 in the feed gas consisting of 10% CO 2 and 90% N 2 was concentrated to higher than 99%. The effects of various system parameters, such as permeate side pressure, temperature, gas and liquid flow rates and the inner diameter of hollow fiber membrane, on the energy consumption for CO 2 recovery were investigated. Energy consumption decreased with increasing temperature and had a minimum at an optimum permeate side pressure. The minimum energy consumption was estimated as 0.211 kWh kg-CO 2 −1 when the inner diameter of the hollow fiber was 0.8 mm. The energy consumption increased with feed gas flow rate, however, it was little influenced by liquid flow rate. The energy consumption decreased remarkably with increasing the inner diameter of the hollow fiber, and it was estimated as 0.072 kWh kg-CO 2 −1 when hollow fibers of 1.4 mm in inner diameter were used. This value is the lowest among those reported so far.
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ethylene ethane separation by Facilitated Transport membrane accompanied by permeation of aqueous silver nitrate solution
Separation and Purification Technology, 2002Co-Authors: Masaaki Teramoto, Nao Takeuchi, Taisuke Maki, Hideto MatsuyamaAbstract:A novel Facilitated Transport membrane, a bulk flow liquid membrane (BFLM), was applied to ethylene/ethane separation using silver nitrate as a carrier. In this membrane system, a carrier solution is supplied to the feed gas side (high pressure side) of a UF membrane and is allowed to permeate to the permeate side (low pressure side). The transferred carrier solution is recycled to the feed side. The effect of such convective flow of the carrier solution through the membrane on ethylene permeance was investigated using a dead-end type filtration cell equipped with an ultrafiltration membrane. The C2H4 permeance, RC2H4, increased with increasing the volumetric permeation flux of the carrier solution u, and when u was 4×10−5m s−1 and the C2H4 partial pressure was 9 kPa, RC2H4 was 4×10−5 mol m−2 s−1 kPa−1 and the selectivity of C2H4 over C2H6 was 1100. This value was ≈30 times that at u=0. This type of membrane was very stable during intermittently performed experiments for more than 2 months.
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Facilitated Transport of co2 through liquid membrane accompanied by permeation of carrier solution
Separation and Purification Technology, 2002Co-Authors: Masaaki Teramoto, Nao Takeuchi, Taisuke Maki, Hideto MatsuyamaAbstract:Abstract The effect of convective flow of a carrier solution through a Facilitated Transport membrane on the CO 2 permeation behavior was investigated using diethanolamine (DEA) as a carrier of CO 2 . A dead-end type filtration cell, equipped with an ultrafiltration membrane, was used as a gas permeation cell. A carrier solution was supplied to the feed side (high pressure side) of the cell and was allowed to permeate to the receiving side (low pressure side) and was circulated between the receiving and the feed side by a pump. The feed gas was a mixture of CO 2 and CH 4 . The convective flow of the carrier solution through the membrane enhanced the gas permeance. For example, the CO 2 permeance, R CO 2 , increased with increasing the volumetric permeation flux of the carrier solution u and when u was 1.9×10 −5 m s −1 and the CO 2 partial pressure was 4.0 kPa, R CO 2 was 6.23×10 −5 mol m −2 s −1 kPa −1 . This value was about ten times that at u =0 with no convective flow of the carrier solution across the membrane. The selectivity of CO 2 over CH 4 was as high as 1970. This type of membrane was very stable during the experiments for more than 2 months.
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preparation of poly acrylic acid poly vinyl alcohol membrane for the Facilitated Transport of co2
Journal of Applied Polymer Science, 2001Co-Authors: Hideto Matsuyama, Masaaki Teramoto, Kenji Matsui, Yoshiro KitamuraAbstract:Poly(acrylic acid) (PAA)/poly(vinyl alcohol) (PVA) membrane was prepared for the Facilitated Transport of CO2. The carrier of CO2 was monoprotonated ethylenediamine and was introduced in the membrane by ion exchange. The ion-exchange capacity of the membrane was 4.5 meq/g, which was much higher than that of the Nafion 117 membrane. The membrane was highly swollen by the aqueous solution. Much higher selectivity of CO2 over N2 and higher CO2 permeability were obtained in the PAA/PVA membrane than in the Nafion membrane because of the higher ion-exchange capacity and solvent content. The highest selectivity was more than 1900 when the CO2 partial pressure in the feed gas was 0.061 atm. Effects of ion-exchange capacity, membrane thickness, and annealing temperature in conditions of membrane preparation on membrane performance were investigated. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 936–942, 2001
Eiji Kamio - One of the best experts on this subject based on the ideXlab platform.
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improvements in the co2 permeation selectivities of amino acid ionic liquid based Facilitated Transport membranes by controlling their gas absorption properties
Journal of Membrane Science, 2014Co-Authors: Shohei Kasahara, Eiji Kamio, Hideto MatsuyamaAbstract:A series of amino acid ionic liquids (AAILs) composed of different cations of different sizes, including trihexyl(tetradecyl)phosphonium glycinate, tetrabutylphosphonium glycinate and triethyl(pentyl)phosphonium glycinate have been synthesized for the carrier of CO2 Facilitated Transport membrane. Their physical properties, including their viscosity, density, molar volume and N2 absorption amount were investigated. The amount of N2 absorption decreased as the size of the cation of the AAIL decreased. Facilitated Transport membranes containing these AAILs were prepared, and their CO2 and N2 permeabilities were measured. The N2 permeabilities were systematically investigated both experimentally and theoretically with the aim of improving the selectivity of the CO2 permeation of the AAIL-based Facilitated Transport membrane. As expected, the CO2 permselectivity was improved using triethyl(pentyl)phosphonium glycinate, which contained the smallest cation of the AAILs investigated in this study. We have proposed a methodology for improving the CO2 selectivity of AAIL-based Facilitated Transport membranes based on reducing their N2 permeabilities.
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Fundamental Investigation of the Factors Controlling the CO2 Permeability of Facilitated Transport Membranes Containing Amine-Functionalized Task-Specific Ionic Liquids
Industrial & Engineering Chemistry Research, 2014Co-Authors: Shohei Kasahara, Eiji Kamio, Akihito Otani, Hideto MatsuyamaAbstract:Task-specific ionic liquid (IL)-based Facilitated Transport membranes were prepared with tetrabutylphosphonium amine-functionalized glycinate or 2-cyanopyrrolide ILs. CO2 permeabilities and viscosity and CO2 absorbance of ILs were evaluated. Viscosities of glycinate- or methylglycinate-containing ILs drastically increased with CO2 absorption, probably from hydrogen bonding between their CO2 complexes. The temperature dependence of the CO2 permeability of the IL-based membranes was opposite to that of the viscosity of the corresponding ILs. The CO2 permeability at low temperature under dry conditions was improved by using tetrabutylphosphonium 2-cyanopyrrolide, which barely forms hydrogen bonds among its CO2 complexes. However, above 363 K, the tetrabutylphosphonium 2-cyanopyrrolide-based membrane had a lower CO2 permeability than the tetrabutylphosphonium glycinate-based membrane because tetrabutylphosphonium 2-cyanopyrrolide absorbed less CO2. The major factors controlling CO2 permeability of task-specif...
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a Facilitated Transport ion gel membrane for propylene propane separation using silver ion as a carrier
Journal of Membrane Science, 2013Co-Authors: Shohei Kasahara, Eiji Kamio, Reiko Minami, Hideto MatsuyamaAbstract:Abstract Facilitated Transport membranes are effective for gas separations but they have some disadvantages, such as leakage of the carrier solution under pressure and volatilization of solvents from the membrane. In this study, a novel gas separation membrane, a Facilitated Transport ion-gel membrane, with high permselectivity, high stability and high pressure tolerance was fabricated using a gelled ionic liquid with a selective-Transport carrier for the target gas. Imidazolium type-ionic liquids, silver salts, and low molecular weight gelators were used to fabricate the ion-gel membrane. Gas absorption isotherms of the ion-gels were measured and studied using a theoretical model considering both physical and chemical absorption. It was found during absorption tests that some gelators deactivated the function of silver ions as a propylene carrier. In addition, gas permeation through ion-gel membranes was analyzed by applying an absorption model that accounted for the decrease in diffusivity caused by gelation of the ionic liquid. Theoretical analysis indicated that the fabricated ion-gel membranes Transported propylene via a Facilitated Transport mechanism and thus Facilitated Transport ion-gel membranes were successfully fabricated. This is the first report describing the fabrication of Facilitated Transport ion-gel membranes.
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Effect of water in ionic liquids on CO2 permeability in amino acid ionic liquid-based Facilitated Transport membranes
Journal of Membrane Science, 2012Co-Authors: Shohei Kasahara, Eiji Kamio, Toru Ishigami, Hideto MatsuyamaAbstract:Abstract Amino acid ionic liquid-based Facilitated Transport membranes with tetrabutylphosphonium amino acid ionic liquids with glycine, alanine, proline and serine as the anion were prepared and their CO 2 permeation properties were evaluated from the physical and physicochemical properties of the amino acid ionic liquids. A tetrabutylphosphonium proline-based Facilitated Transport membrane showed an excellent CO 2 permeability of 14,000 Barrer, twice that of the others investigated, and a CO 2 /N 2 selectivity of 100 at 373 K under dry conditions. Thermogravimetric measurement showed that the tetrabutylphosphonium proline had a relatively high water-holding ability compared with the other amino acid ionic liquids investigated. The strong water holding ability of tetrabutylphosphonium proline realized the large absorption amount of CO 2 and established a large concentration gradient for the CO 2 -complex across the membrane. The large concentration gradient provided a large driving force for CO 2 -complex Transport through the membrane and increased CO 2 permeability.
