제철 부생가스로부터 수소 생산을 위한 반 결정성 폴리이미드 소재 분리막 개발

초록

Polyimide membranes were prepared for use in hydrogen purification from the coke oven gas (COG) produced in steel making industry. A low cost polyimide of 5-(2,5-dioxotetrahydrofuryl)-3-methyl-cyclohexane-1,2-dicarboxylic anhydride-4.4’-oxydianiline (DOCDA-ODA) was employed as a new polymer. Both dense films and thin composite membranes were prepared. Comparing with a dense film prepared from a commercial polyimide, the dense DOCDAODA film exhibited high H2/CH4 gas selectivity and low hydrogen permeability. Thin DOCDA-ODA membranes were also prepared on alumina substrates, and the separation performance was optimized through tuning coating conditions as well as applying caulking layers. The intrinsic gas separation of the DOCDA-ODA material was well-preserved in the DOCDA-ODA membranes. A DOCDA-ODA membrane showed H2/CH4 selectivity of 234.22 and H2 permeance of 147.56 GPU, which value was higher than that of a commercial polyimide membranes. Thus, DOCDA-ODA polymer would expect to be used as a low cost polymeric material for the hydrogen separation membrane.

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