Asymmetric copolyimide membranes fabricated by nonsolvent-induced phase separation for He/CH_(4) and He/N_(2) separation

作     者：Ying Li Lu Wang Junyan Xie Yong Dai Xuehong Gu Xuerui Wang Ying Li;Lu Wang;Junyan Xie;Yong Dai;Xuehong Gu;Xuerui Wang

作者机构：State Key Laboratory of Materials-Oriented Chemical EngineeringCollege of Chemical EngineeringNanjing Tech UniversityNanjing 211816China Quzhou Membrane Material Innovation InstituteQuzhou 324000China 

出 版 物：《Frontiers of Chemical Science and Engineering》 (化学科学与工程前沿（英文版）)

年 卷 期：2024年第18卷第4期

页      面：97-106页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070305[理学-高分子化学与物理] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：sponsored by the National Key Research and Development Program of China(Grant No.2021YFC2101203) the National Natural Science Foundation of China(Grant Nos.22178164 and U22B20148) the Jiangsu Provincial Carbon Peak Carbon Neutral Science and Technology Innovation Special Fund(Grant No.BE2022033) the Jiangsu Specially-Appointed Professors Program the State Key Laboratory of Materials-Oriented Chemical Engineering(Grant No.ZK202002) 

主　　题：He separation membrane natural gas copolyimide 

摘      要：Membrane gas separation is considered an energy-saving technique to extract He from natural gas due to no phase change and room temperature ***,the membrane performance was strongly limited by the trade-off between permeance and ***,novel 4,4′-(hexafluoroisopropylidene)diphthalic anhydride(6FDA)-2,2′-bis(3-amino-4-hydroxyphenyl)hexafluoropropane(APAF)-5-amino-2-(4-aminobenzene)benzimidazole(BIA)asymmetric membranes with a thickness of 300 nm were successfully prepared by the non-solvent induced phase separation *** membrane performance was modulated by regulating dope solution compositions(e.g.,tetrahydrofuran and polymer concentration).The ideal He/CH_(4) selectivity was 124 and the optimized He permeance reached 87 GPU,beyond the current upper ***/CH_(4) selectivity was 75 and He permeance was 73 GPU for the binary mixture feed containing 0.2 mol%*** membrane showed good resistance to CO_(2) and C_(2)H_(6),which are the typical impurities in natural *** 6FDA-APAF-BIA membranes have good stability(160 h),which can provide great potential in He extraction from natural gas.