一步法制备含氨基化合物的非对称CO2分离膜  

One-step fabrication of asymmetric membranes containing amino compound for CO_2 separation

作　　者：曹晓畅 王志[1] 乔志华[1] 王纪孝[1] 许振良[2] CAO Xiaochang;WANG Zhi;QIAO Zhihua;WANG Jixiao;XU Zhenliang(State Key Laboratory of Chemical Engineering,Tianjin Key Laboratory of Membrane Science and Desalination Technology,Collaborative Innovation Center of Chemical Science and Engineering(Tianjin),Chemical Engineering Research Center,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China;State Key Laboratory of Chemical Engineering,Membrane Science and Engineering R&D Lab oratory,Chemical Engineering Research Center,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]化学工程联合国家重点实验室,天津大学化工学院化学工程研究所,天津化学化工协同创新中心,天津市膜科学与海水淡化技术重点实验室,天津300072 [2]化学工程联合国家重点实验室,华东理工大学化学工程研究所膜科学与工程研发中心,上海200237

出　　处：《化工学报》2018年第11期4778-4787,共10页CIESC Journal

基　　金：国家科技支撑计划项目(2017YFB0603400);国家自然科学基金项目(21436009)。

摘　　要：采用一步相分离法,制备以聚醚砜(PES)为主体材料,二乙醇胺(DEA)为添加剂和氨基载体的膜,用于CO_2分离。考察了PES浓度、DEA浓度、膜厚度对CO_2/N_2分离性能的影响,同时考察了膜性能的长时间稳定性。当涂膜液中DEA/PES的质量比为12/26、刮刀与无纺布的距离为300μm、进料气压力为0.11 MPa(表压)时,膜的CO_2渗透速率可达274 GPU,CO_2/N_2分离因子可达50。测试温度低于40℃时,DEA/PES膜的CO_2渗透速率和CO_2/N_2分离因子保持稳定。另外,对CO_2/N_2分离性能较好的DEA/PES膜(质量比为12/27)进行CO_2/CH_4分离性能测试,在1 MPa(表压)下性能优于商品膜。上述结果表明,本文研制的DEA/PES膜制备步骤简单,易于规模化制备,性能较优,在CO_2分离领域具有良好的应用前景。A one-step phase separation method was used to prepare a membrane base on polyethersulfone(PES)and diethanolamine(DEA)as an additive and an amino carrier for CO2 separation.CO2 separation membranes show promising applications in energy gas purification and flue gas CO2 capture.However,the separation performance of commercial membranes can hardly meet the practical requirement.To easily fabricate membrane with enhanced CO2 separation performance,diethanol amine(DEA)was filled into polyether sulfone(PES)to fabricate asymmetric membranes in one-step by non-solvent induce phase separation(NIPs).The effects of the PES content,DEA content,coating thickness and the heat treatment on the separation performance of DEA/PES membrane were investigated by using CO2/N2 mixed gas(15/85 by volume).When the PES content was 26%and the DEA content was 12%in the coating solution and the feed gas pressure was 0.11 MPa,the DEA/PES membrane exhibited a CO2 permeance of 274 GPU and a CO2/N2 selectivity of 50.The stability results indicate that the CO2/N2 separation performance of DEA/PES membrane remained stable at 40℃.Moreover,the CO2/N2 best-performing DEA/PES membrane was used to separate CO2/CH4 mixed gas(10/90 by volume).The CO2/CH4 separation performance at 1.0 MPa was better than commercial membranes.These results shows promising applications of DEA/PES membranes in CO2 separation.

关 键 词：CO2分离 一步法 相分离 非对称膜 规模化 聚醚砜 

分 类 号：TQ028.8[化学工程]