MIL-101(Cr)/共聚酰亚胺混合基质CO2/CH4分离膜的性能表征  

Characterization of MIL-101(Cr)/copolyimide mixed matrix membrane for CO2/CH4 separation

作　　者：韩悦 吴婷婷 王岩 任广杰 刘艳 贡洁 王重庆 蒋金龙 潘宜昌 HAN Yue;WU Tingting;WANG Yan;REN Guangjie;LIU Yan;GONG Jie;WANG Chongqing;JIANG Jinlong;PAN Yichang(State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211800, China;CNOOC Tianjin Chemical Research and Design Institute Co. Ltd., Tianjin 300131, China;College of Chemical and Environmental Engineering, Jiangsu University of Technology, Changzhou 213001, China;Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province, Faculty of Chemical Engineering, Huaiyin Institute of Technology, Huaian 223003, China)

机构地区：[1]南京工业大学化工学院材料化学工程国家重点实验室,江苏南京211800 [2]中海油天津化学研究设计院有限公司,天津300131 [3]江苏理工学院化学与环境工程学院,江苏常州213001 [4]淮阴工学院化学工程学院江苏省凹土资源利用重点实验室,江苏淮安223003

出　　处：《南京工业大学学报（自然科学版）》2021年第1期32-39,共8页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家自然科学基金(21776124);江苏省自然科学基金(BK20171459);江苏省高等学校自然科学研究计划(17KJA530004)。

摘　　要：为了有效提高膜分离技术对CO2/CH4混合气的分离效果,以2-双(3,4-二羧基苯基)六氟丙烷二酐(6FDA)为二酐单体、2,4,6-三甲基-1,3-苯二胺(TMPDA)和2,6-二氨基甲苯(2,6-DAT)为二胺单体,制备新型6FDA型聚酰亚胺共聚物6FDA-TMPDA/2,6-DAT。将金属有机骨架(MOF)材料MIL-101(Cr)纳米晶体掺杂到6FDATMPDA/2,6DAT中制备混合基质膜(MMMs)。考察MIL-101(Cr)纳米晶体掺杂量和操作压力对混合基质膜分离CO2/CH4混合气的分离性能和抗塑化性能的影响。此外,还研究了进料总逸度对混合基质膜塑化性能的影响。结果表明:在35℃、0.2 MPa下进料时,掺杂20%MIL-101(Cr)纳米晶体的混合基质膜CO2的渗透通量和CO2/CH4的分离系数分别为1.29×10^-8 cm^3·cm/(cm^2·s·kPa)和49。该混合基质膜对CO2/CH4的气体分离性能和抗塑化性能相比于纯6FDA-TMPDA/2,6-DAT膜有所提高,说明MIL-101(Cr)/共聚酰亚胺混合基质膜在CO2/CH4气体分离方面具有广泛的应用前景。To improve the separation performance of CO2/CH4 gas mixture by membrane technology,a new 6FDA-type polyimide copolymer 6FDA-TMPDA/2,6-DAT was prepared by using 2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride(6FDA)as the dianhydride monomer,and 2,4,6-trimethyl-1,3-phenylenediamine(TMPDA)and 2,6-diaminotoluene(2,6-DAT)as diamine monomers.A metal-organic framework(MOF)material of MIL-101(Cr)nanocrystals were doped into 6FDA-TMPDA/2,6-DAT to prepare mixed matrix membranes(MMMs).The doping amount of MIL-101(Cr)nanocrystals was investigated,and the effect of operating pressure on the separation performance and anti-plasticization of CO2/CH4 gas mixture on MMMs was studied.The effect of the total fugacity of the feed on the plasticization properties of MMMs was also studied.Results showed that under the conditions of 35℃and 0.2 MPa,the CO2 permeation flux and CO2/CH4 separation coefficient of 20%(mass fraction)MIL-101(Cr)/copolyimide membrane were 1.29×10^-8 cm^3·cm/(cm^2·s·kPa)and 49,respectively.The gas separation performance and anti-plasticization performance of the MMMs for CO2/CH4 were both improved compared to pure polymer membranes,indicating that the MIL-101(Cr)/copolyimide MMMs had promising application in CO2/CH4 gas separation.

关 键 词：混合基质膜 气体分离 MIL-101(Cr) CO2 共聚物膜 

分 类 号：O647.32[理学—物理化学] TQ028.2[理学—化学]