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Noble gases separation performance of polyimide membranes

Authors： LI Siqi, ZHAO Dan，LI Hui，CHEN Zhanying，REN Jizhong

Units： 1. National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China；2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. CTBT Beijing National Data Centre Radionuclide Laboratory, Beijing 100085,China

KeyWords： polyimide；noble gas separation；membrane separation；heat treatment

ClassificationCode：TQ051.893

year,volume(issue):pagination： 2023,43(4):90-98

Abstract：

Cryogenic distillation is carried out by using the difference in the boiling points of gases to separate noble gases. Compared with this traditional method, membrane technology has excellent properties such as higher efficiency, lower consumption, and being more environmentally friendly. The selection of membrane materials and their post-treatment are critical to the gas separation efficiency of membrane technology. In this paper, the polyimides PI-1 (BTDA-MDA/TDA) and PI-2 (PMDA/BTDA-TDA) were selected to study the effect of their distinct structures on the separation performance of noble gases. After that, the polyimide membrane with excellent performance was heat treated under different conditions, and the influence of heat treatment temperature on gas separation performance was investigated. According to the research, by changing the composition of the polyimide, the noble gas selectivity and permeability of this polyimide membrane could be adjusted. Different heat treatment conditions could change the permeability and separation performance of the membrane by changing the chain accumulation in the membrane, forming part of the membrane structure, and removing the plasticizing effect of the residual solvent. By controlling the heat treatment conditions, the permeability and selectivity of the membrane can be improved at the same time. The He permeability coefficient increased to 19.1 Barrer, and the selectivity of He/CH4 increased by 54%, while the selectivity of O2/Xe increased by 99%.

Funds：

中国科学院稳定支持基础研究领域青年团队计划（YSBR-017）；中国科学院战略性先导科技专项（XDC10020203）；中国科学院战略性先导技专项子课题(XDA21070606)

AuthorIntro：

李思琪（1998-），女，山东菏泽人，硕士生，主要从事气体分离方面的研究

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