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Separation of CO2 from other gases is critically important in many industrial processes such as hydrogen production, biogas purification and post– and pre– combustion CO2 capture in fired power plants. Membrane gas separation has recently attracted significant attention because of its high potential for energy saving, low cost operation and unit size reduction1). Over the past several decades, numerous CO2 separation membranes have been developed. Although polymeric membranes have been the most widely investigated among several types of CO2 selective membranes, the CO2 permeability and CO2/N2 selectivity of polymeric membranes are relatively low in some cases2). To overcome the low performance of polymeric membranes, facilitated transport membranes (FTMs) have recently attracted considerable attention3~ 10). FTMs are a type of functional membrane containing a reactive compound, the so–called “carrier”, which can drastically enhance the permeability and permselectivity of a targeted gas. The gas permeation mechanism of FTMs is based on the reversible reaction between the targeted gas and a carrier incorporated in the membrane. Various FTMs for CO2 capture have been developed and many efforts have been made to enhance the CO2 permeability and selectivity. The specific performances of the FTMs have been widely investigated and it was empirically determined that the CO2 permeability and selectivity of FTMs under humid conditions were quite high4, 6, 8, 9, 11, 12). Especially, the CO2 permeabilities of the FTMs containing amino acid as the CO2 carrier were strongly affected by humidity in the gas stream6, 8). Therefore, it is expected that the CO2 per*Corresponding Author Tel: +81-78-803-6180 Fax: +81-78-803-6180 E-mail: matuyama@kobe-u.ac.jp To improve the CO2 permeability of facilitated transport membranes, we investigated the effect of ionic liquid additives into the membrane. In this study, glycine was used as a CO2 carrier and polyvinyl alcohol as a gel matrix to contain the CO2 carrier and additives. To investigate the effect of the water vapor absorbability of the gel membrane on the CO2 permeability, ionic liquids with various degrees of hydrophilicity were examined as additives. When the highly hydrophilic ionic liquids were added to the membrane, a large amount of water was absorbed in the membrane under humid conditions. With the aid of water, glycine dissolved in a fully water stained gel membrane could react with CO2 under humid conditions and elevated temperatures from 110 to 130°C. Because of the high liquidity of the ionic liquid within a wide temperature range, the formed CO2 complex could easily diffuse into the membrane from the feed side to the permeate side. Thus, CO2 permeability and CO2/N2 selectivity were highly improved; e.g., at 110°C , the CO2 permeance was increased from 3.6×10–6 to 6.4×10–5 mol/(m2skPa) and CO2/N2 selectivity from 17.3 to 192 (–). Moreover, the non–volatility and thermal stability of an ionic liquid enabled improved CO2 permeation for extended periods under elevated temperature conditions. Therefore, the addition of ionic liquid was useful to enhance the gas permeation properties whilst maintaining high stability.

【Original Contribution】 Effect of Ionic Liquid Additives on CO2Permeation and CO2/N2Selectivity through Facilitated Transport Membranes