Preparation of SPEEK/PSI semi-interpenetrating network blend membrane and its CO2 separation |
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| Authors: | GAO Yin WANG Yonghong ZHANG Xinru LI Jinping LING Jun |
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| Affiliation: | 1.College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China;2.Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Taiyuan 030024, Shanxi, China;3.Technology Center, China Tobacco Yunnan Industrial Co. Ltd. , Kunming 650231, Yunnan, China |
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| Abstract: | To obtain high-performance gas separation membranes and realize high-efficiency separation and recovery of CO2/N2 in flue gas, the amino-rich semi-interpenetrating network blend membranes were prepared by in-situ crosslinking reaction, which provided CO2 transport channels and affinity sites. Sulfonated poly(ether ether ketone) (SPEEK) and polysuccinimide (PSI) were used as raw materials, and hexamethylenediamine was crosslinking agent. The structure of the blend membranes was characterized by Fourier-transform infrared spectroscopy. The effects of water content, PSI dosage and feed gas pressure on the gas separation performance were studied, and its gas separation performance and the long-time stability were investigated under mixed gas conditions. The results showed that SPEEK and PSI have a good compatibility, and there is a strong interaction between them, which exhibited the semi-interpenetrating network microstructure in the membranes. When the PSI loading is 60%(mass), the CO2 permeability of pure gas and mixed gas are 652 and 601 Barrer, respectively, and the corresponding CO2/N2 selectivity is 67.6 and 60.3, which is better than that in pristine SPEEK membrane, surpassing 2008 Robeson upper bound. The CO2 permeability and CO2/N2 selectivity are still stable after 360 h durability test of SPEEK/PSI-60 blend membrane. This is mainly due to the formation of the amino-rich semi-interpenetrating network microstructure between SPEEK and PSI, which not only provides CO2 facilitated transport carriers, but also enhances the water retention performance of the blend membranes and forms a large number of CO2 transport water channels. |
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| Keywords: | blend membrane polysuccinimide sulfonated poly(ether ether ketone) semi-interpenetrating network structure CO2 separation |
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