首页|Asymmetric copolyimide membranes fabricated by nonsolvent-induced phase separation for He/CH4 and He/N2 separation

Asymmetric copolyimide membranes fabricated by nonsolvent-induced phase separation for He/CH4 and He/N2 separation

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Membrane gas separation is considered an energy-saving technique to extract He from natural gas due to no phase change and room temperature operation.However,the membrane performance was strongly limited by the trade-off between permeance and selectivity.Herein,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 method.The membrane performance was modulated by regulating dope solution compositions(e.g.,tetrahydrofuran and polymer concentration).The ideal He/CH4 selectivity was 124 and the optimized He permeance reached 87 GPU,beyond the current upper bound.He/CH4 selectivity was 75 and He permeance was 73 GPU for the binary mixture feed containing 0.2 mol％He.The membrane showed good resistance to CO2 and C2H6,which are the typical impurities in natural gas.The 6FDA-APAF-BIA membranes have good stability(＞160 h),which can provide great potential in He extraction from natural gas.

He separationmembranenatural gascopolyimide

Ying Li、Lu Wang、Junyan Xie、Yong Dai、Xuehong Gu、Xuerui Wang

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State Key Laboratory of Materials-Oriented Chemical Engineering,College of Chemical Engineering,Nanjing Tech University,Nanjing 211816,China

Quzhou Membrane Material Innovation Institute,Quzhou 324000,China

国家重点研发计划国家自然科学基金国家自然科学基金Jiangsu Provincial Carbon Peak Carbon Neutral Science and Technology Innovation Special FundJiangsu Specially-Appointed Professors ProgramState Key Laboratory of Materials-Oriented Chemical EngineeringChina Petroleum Engineering Construction Co.,Ltd

2021YFC210120322178164U22B20148BE2022033ZK202002

2024

10.1007/s11705-024-2405-5

化学科学与工程前沿
高等教育出版社

化学科学与工程前沿

CSTPCDEI
影响因子：0.172
ISSN：2095-0179
年,卷(期)：2024.18(4)
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