首页|芳烃官能化有机硅膜的制备及丙烯/丙烷分离性能

芳烃官能化有机硅膜的制备及丙烯/丙烷分离性能

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利用具有单苯和联苯桥联结构的有机硅前体1,4-二(三乙氧基硅基)苯(BTESB)和4,4'-二(三乙氧基硅基)联苯(BTESBPh),通过溶胶-凝胶法制备成有机硅膜并应用于丙烯/丙烷分离.在25℃时,BTESB膜的C3H6渗透速率为3.4×10-9mol/(m2·s·Pa),C3H6/C3H8选择性为9.6;BTESBPh膜的C3H6渗透速率为1.7×10-8mol/(m2·s·Pa),C3H6/C3H8选择性为10.5.具有联苯桥联结构的BTESBPh膜网络结构更为疏松,可获得更高的气体渗透速率.苯环中大π键与待分离组分C3H6中的碳碳双键产生π-π相互作用,有利于C3H6组分的优先吸附和渗透.而BTESBPh中联苯结构增强了这一过程,表现为低温测试条件下,BTESBPh膜的C3H6/C3H8选择性略高于BTESB膜.本研究可为高性能丙烯/丙烷气体分离膜的开发提供参考.
Fabrication of aromatic functionalized organosilica membranes and gas separation performance
Two organosilica presursors,1,4-bis(triethoxysilyl)benzene(BTESB)with benzene bridges and 4,4'-bis(triethoxysilyl)biphenyl(BTESBPh)with biphenyl bridges were utilized for the fabrication of organosilica membranes via the sol-gel strategy.The two membranes were applied to the gas separation.At 25℃,BTESB membrane displayed a C3H6 permeance of 3.4×10-9mol/(m2·s·Pa)and C3H6/C3H8 selectivity of 9.6.Nevertheless,BTESBPh membrane showed a C3H6 permeance of 1.7×10-8mol/(m2·s·Pa)and a comparable C3H6/C3H8 selectivity of 10.5.BTESBPh membrane networks with biphenyl bridged structures were much looser and could achieve higher gas permeance.The π-π interactions occurred between the big π bond in the benzene ring and the C== C bond in the C3H6 molecules,which was beneficial for the preferential adsorption and permeation of the C3H6 molecules.The biphenyl bridges in BTESBPh membranes enhanced the adsorption and permeation process,as evidenced by the increased C3H6/C3H8 selectivity of the BTESBPh membrane under low testing temperatures.This study could provide a reference for the development of high-performance propylene/propane separation membranes.

organosilica membranespore sizeC3H6/C3H8 separationsol-gel methodmolecular sieving

钱俊明、郭猛、任秀秀、余亮、钟璟、徐荣

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常州大学石油化工学院,常州大学精细石油化工江苏省重点实验室,江苏常州 213164

北京理工大学前沿交叉科学研究院,北京 100081

有机硅膜 孔径 丙烯/丙烷分离 溶胶-凝胶法 分子筛分

江苏省自然科学基金青年基金江苏省自然科学基金青年基金江苏省高等学校自然科学研究重大项目江苏省精细石油化工重点实验室开放基金常州市科技计划常州市科技计划常州市科技计划

BK20210855BK2020098222KJA530001KF2105CJ20220140CE20225057CZ20220033

2024

10.16085/j.issn.1000-6613.2023-0443

化工进展
中国化工学会,化学工业出版社

化工进展

CSTPCD北大核心
影响因子：1.062
ISSN：1000-6613
年,卷(期)：2024.43(3)
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