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Preparation of BTDA/6FDA-DAM/2,6DAT block-polyimide membranes and its gas separation performance

Authors： Guo Xin，Yi Hualei， Duan Cuijia，Hao Yun， Li Enshang，Luo Xinyu

Units： 1 CNOOC Research Institute Ltd，Beijing 100028；2 CenerTech Tianjin Chemical Research and Design Institute Co.，Ltd.，Tianjin 300130，China；3 Tianjin university，Tianjin 300071，China

KeyWords： Block-polyimide；natural gas；gas separation membrane

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2022,42(1):80-87

Abstract：

Block-polyimide with different block structure or block length was synthesized using 6FDA, BTDA, DAM and 2,6DAT. Chemical structure, chain stacking structure, thermal property, mechanical strength and gas separation performance of block-polyimide were studied by FT-IR, XRD, DSC, mechanical strength testing machine and gas permeator. DSC showed that glass transition temperature of block-polyimide was slightly lower than that of random copolyimide. The gas permeability test results showed that the gas permeability of (BTDA-DAM)/ (6FDA-2,6DAT)-x and (BTDA-2,6DAT)/(6FDA-DAM)-x with different block structure showed an opposite trend with the increase of block length. When block length is 5 or 10, the gas separation performance of block-polyimide membranes is optimal: CO2 permeability of (BTDA-DAM)/(6FDA-2,6DAT)-5 is 52.5% higher than that of random copolymer polyimide membrane, and CO2/CH4 selectivity is almost unchanged.

Funds：

中国海洋石油集团有限公司科技项目“分子筛膜材料的开发及其在海上天然气脱?H2O&CO2分离中的应用”（CNOOC-KJ135ZDXM35TJY006-2019）

AuthorIntro：

郭欣（1986-），男，硕士，高工，海洋石油工艺设计

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