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
Synthesis of metal-organic framework based ion hydrogel membranes for C3H6/C3H8 separation
高云硕 1孙玉绣 1刘丽娟 2耿晨旭 1张政清 1乔志华1
作者信息
- 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
- 折叠
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(10～40℃,0.15～0.3 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.
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-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.
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Key words
metal-organic frameworks/mixed matrix membranes/ion gel/high doping content/C3H6/C3H8 separation引用本文复制引用
出版年
2024
NETL
NSTL
万方数据