膜科学与技术

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Synthesis of metal-organic framework based ion hydrogel membranes for C3H6/C3H8 separation

Authors： GAO Yunshuo,SUN Yuxiu, LIU Lijuan, GENG Chenxu,ZHANG Zhengqing, QIAO Zhihua

Units： 1 State Key Laboratory of Separation Membranes and Membrane Processes, School of Chemical Engineering and Technology, Tiangong Univerisity, Tianjin 300387, China; 2 PPG Coating (Tianjin) Co., Ltd., Tianjin 300457, China

KeyWords： metal-organic frameworks; mixed matrix membranes; ion gel; high doping content; C3H6/C3H8 separation

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2024,44(2):19-28

Abstract：

Three MOF metal organic frameworks (ZIF-8) with different particle sizes were synthesized by adjusting the reaction time in methanol solution at room temperature. ZIF-8/IL/Pebax ionic gel membranes were prepared by mixing MOFs with ionic liquid 1-propyl-3-methylimidazolium ditrifluoromethyl sulfonate imide salt (Pmim-Tf2N) and polyether copolyamide (Pebax 1657) for the separation of propylene/propane mixed gas system. Through the synergistic effect of ZIF-8 particles and Ionic liquid in Pebax membrane, high doping of metal-organic framework(MOF) fillers in polymer matrix (up to 70 %) was achieved, and the gas separation performance of C3H6/C3H8 system was significantly improved. The results show that the C3H6 permeability of the resulting ZIF-8/IL/Pebax ion gel membrane is increased by 385 % compared with the Pebax pure membrane, reaching 227.1 Barrer at 70 % doping mass fraction. Meanwhile, the selectivity of C3H6/C3H8 was also increased from 3.04 to 25.11. In addition, ZIF-8/IL/Pebax ionic gel membranes exhibit excellent gas separation performance at different temperatures and pressures (10 oC - 40oC, 0.15 MPa - 0.3MPa). This study has important practical potential in the field of C3H6/C3H8 separation and has shown good application prospects.

Funds：

国家自然科学基金项目(22108202).

AuthorIntro：

高云硕(1997-)，男，黑龙江省肇源县人，硕士研究生，主要研究方向为MOF基气体分离膜应用，Email：1014180096@qq.com

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