Sorption behavior and separation performance of novel facilitated transport membranes for CO2/CH4 mixtures

Abstract A water-soluble copolymeric membrane material containing tertiary amine and carboxyl groups for CO 2 facilitated transport has been synthesized by radical polymerization of DMAEMA(2- N , N -dimethyl aminoethyl methacrylate)-AA(acrylic acid). The composition the copolymer was determined by elemental analysis, the intrinsic viscosity [ ƞ ] of the copolymer was determined with an Ubbelohde viscometer. The composite membranes were prepared by casting solution of poly(2- N , N -dimethyl aminoethyl methacrylate- co -acrylic acid sodium) on the various support layer. The copolymeric membranes were crosslinked by heat treatment at 120°C. The effects of the molecular weight and carrier (tertiary amine and carboxyl groups) content of the copolymer, the support layer of the composite membrane, CO 2 content in CO 2 /CH 4 mixed gas, on the membranes separation performance were investigated. The result shows that the CO 2 /CH 4 selectivity of the composite membrane increased but the CO 2 permeation rate decreased with increasing molecular weight of the copolymer, both the CO 2 /CH 4 selectivity of and the CO 2 permeation rate had a maximum against the carrier (tertiary amine and carboxyl groups) content of the copolymer. The permeation performance of the composite membrane for CO 2 /CH 4 mixed gas was not as good as those obtained with pure CO 2 and CH 4 gas because of the coupling effects between CO 2 and CH 4 .

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