SPEEK/PSI半互穿网络共混膜的制备及其CO2分离研究  

Preparation of SPEEK/PSI semi-interpenetrating network blend membrane and its CO2 separation

作　　者：高殷 王永洪[1,2] 张新儒 李晋平[1,2] 凌军 GAO Yin;WANG Yonghong;ZHANG Xinru;LI Jinping;LING Jun(College of Chemistry and Chemical Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China;Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization,Taiyuan 030024,Shanxi,China;Technology Center,China Tobacco Yunnan Industrial Co.Ltd.,Kunming 650231,Yunnan,China)

机构地区：[1]太原理工大学化学化工学院,山西太原030024 [2]气体能源高效清洁利用山西省重点实验室,山西太原030024 [3]云南中烟工业有限责任公司技术中心,云南昆明650231

出　　处：《化工学报》2020年第12期5813-5820,F0002,共9页CIESC Journal

基　　金：国家自然科学基金面上项目(22078216);国家自然科学基金青年基金项目(21506140);山西省煤层气联合基金项目(2015012009)。

摘　　要：为了获得高性能的气体分离膜,实现烟道气中CO2/N2高效分离回收,以磺化聚醚醚酮(SPEEK)和聚琥珀酰亚胺(PSI)为原料,己二胺为交联剂,原位交联反应制备富含氨基的半互穿网络共混膜,在膜内构建CO2传递通道和亲和位点,并采用红外光谱对共混膜的结构进行表征。研究水含量、PSI用量和进料气压力对膜气体分离性能的影响,在混合气条件下考察其气体分离性能和长时间运行稳定性。研究结果表明:SPEEK与PSI两相界面相容性较好,它们之间存在较强的相互作用,且呈半互穿网络微结构;PSI含量为60%(质量)时,纯气和混合气条件下CO2渗透性分别为652和601 Barrer,对应的CO2/N2选择性为67.6和60.3,优于纯SPEEK膜,且超过2008年的Robeson上限;共混膜运行360 h后,CO2渗透性和CO2/N2选择性仍然稳定。这主要是因为SPEEK与PSI形成富含氨基的半互穿网络微结构后,一方面提供了CO2促进传递载体;另一方面,增强了共混膜的保水性能,形成大量CO2传递水通道。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 360h durability test of SPEEK/PSI-60 blend membrane.This is mainly due to the formation of the amino-rich semiinterpenetrating 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.

关 键 词：共混膜 聚琥珀酰亚胺 磺化聚醚醚酮 半互穿网络结构 CO2分离 

分 类 号：TQ028.8[化学工程]