膜科学与技术

金属-有机骨架离子凝胶膜的制备及其在C3H6/C3H8分离中的应用

作者：高云硕，孙玉绣，刘丽娟，耿晨旭，张政清，乔志华

单位： 1天津工业大学省部共建分离膜与膜过程国家重点实验室，化学工程与技术学院，天津 300387; 2 PPG涂料（天津）有限公司，天津 300457

关键词：金属-有机骨架；混合基质膜；离子凝胶；高掺杂量；C3H6/C3H8分离

出版年,卷(期):页码： 2024,44(2):19-28

摘要：

通过调节反应时间合成出3种不同颗粒大小金属-有机骨架(ZIF-8)，并将其与离子液体1-丙基-3-甲基咪唑双三氟甲磺酰亚胺盐(PmimTf2N)和聚醚共聚酰胺(Pebax 1657)混合制得ZIF-8/IL/Pebax离子凝胶膜用于对丙烯/丙烷混气体系的分离。通过ZIF-8颗粒与离子液体在Pebax膜中的协同作用，实现了金属有机骨架(MOF)填料在聚合物基质中高达70 %的质量掺杂量， C3H6/C3H8体系的气体分离性能也得到明显提升。研究表明，ZIF-8/IL/Pebax离子凝胶膜相比于Pebax纯膜，C3H6渗透通量提高了385 %，达到了227.1 Barrer；同时，C3H6/C3H8的选择性也从3.04提高到了25.11。此外，在不同温度和压力条件下(10 oC ~ 40 oC, 0.15 MPa ~ 0.3 MPa)，ZIF-8/IL/Pebax离子凝胶膜均表现出优异的气体分离性能，并表现出了良好的应用前景。

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.

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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