Effects on Carbon Molecular Sieve Membrane Properties for a Precursor Polyimide with Simultaneous Flatness and Contortion in the Repeat Unit

ChemSusChem
Jiachen LiangJian Jin

Abstract

Carbon molecular sieve (CMS) based membrane separation is a promising solution for hydrogen separation due to their great advantages on perm-selectivity, thermal stability, and chemical stability. To prepare high performance CMS membranes, molecular structure of polymer precursors and their arrangements should be primarily considered. In this work, a benzimidazole based 6FDA (2,2'-bis(3,4'-dicarboxyphenyl) hexafluoropropane dianhydride) type polyimide (PABZ-6FDA-PI) is chosen as precursor to prepare CMS membrane. Effects of chain flatness and contortion in polyimide precursor on gas separation performance of CMS membranes were studied in detail by gas adsorption and permeation experiment. The H2 permeability of CMS is up to 9500 Barrer and ideal selectivity of gas pairs of H2/CH4 and H2/CO2 is up to 3800 and 13, respectively. The comprehensive performance of hydrogen separation including H2/CO2, H2/N2, and H2/CH4 gas pairs is located well above the 2015 upper bound for polymers.

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