Synthesis of metal-organic framework based ion hydrogel membranes for C3H6/C3H8 separation
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-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(10-40 ℃,0.15-0.3 MPa).This study has important practical potential in the field of C3H6/C3H8 separation and has shown good application prospects.
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