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Preparation of hyperbranched copolyimide membrane and its CO2/CH4 gas separation performance

Authors： Yi Hualei,Guo Xin, Yang Tao, GAO Peng,Duan Cuijia, Luo Xinyu

Units： 1 CNOOC Research Institute, Beijing 100028, China; 2 CenerTech Tianjin Chemical Research and Design Institute Co.，Ltd., Tianjin 300130, China; 3 Dalian University of Technology, Dalian 116081, China

KeyWords： hyperbranched polyimide, gas separation, tetramine, thermoimide.

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2023,43(4):54-59

Abstract：

Adding different proportions of N,N,N',N'-tetra (p-aminophenyl) p-phenylenediamine (NTPDA) tetramine monomers into the 4, 4-hexafluoro-isopropyl phthalic anhydride (6FDA) and 4,4'-diamino-diphenyl ether (ODA) polyimide (6FDA-ODA), a series of hyperbranched copolyimide membranes (6FDA-ODA-NTPDA) were prepared by thermal imimide method. The structure , thermal stability, Tg and crystallinity of the membranes were characterized by infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and X-ray diffraction (XRD) respectively. The permeability and separation properties of the membranes for CO2/CH4 gas were tested. The results showed that compared with the pure membrane (6FDA-ODA), when the tetramine mole fraction was 5‰, the CO2 permeability coefficient was increased by 117.32% and the CO2/CH4 selectivity was increased by 78.5% .

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AuthorIntro：

衣华磊（1982-），男，高级工程师，2007年毕业于中国石油大学 (华东) ，现主要从事海上平台的设计与研究工作，E-mail：yihl@cnooc.com.cn

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