用于CO/CH分离的聚酰亚胺/离子液体混合膜的制备

Preparation of Polyimide/Ionic Liquid Hybrid Membrane for CO/CH Separation.

作者信息

Du Xiaoyu, Zhao Shijun, Qu Yanqing, Jia Hongge, Xu Shuangping, Zhang Mingyu, Geng Guoliang

机构信息

College of Materials Science and Engineering, Qiqihar University, Qiqihar 161006, China.

出版信息

Polymers (Basel). 2024 Jan 31;16(3):393. doi: 10.3390/polym16030393.

DOI:10.3390/polym16030393

PMID:38337282

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10856979/

Abstract

Imidazole ionic liquids (IL) have good affinity and good solubility for carbon dioxide (CO). Such ionic liquids, combined with polyimide membrane materials, can solve the problem that, today, CO is difficult to separate and recover. In this study, the ionic liquid (IL) of 1-ethyl-3-methylimidazolium tetrafluoroborate (IL), 1-pentyl-3-methylimidazolium tetrafluoroborate (IL), 1-octyl-3-methylimidazolium tetrafluoroborate (IL), and 1-dodecylimidazolium tetrafluoroborate (IL) with different contents were added to a polyimide matrix, and a series of polyimide membranes blended with ionic liquid were prepared using a high-speed mixer. The mechanical properties and gas separation permeability of the membranes were investigated. Among them, the selectivity of the PI/IL membrane for CO/CH was 180.55, which was 2.5 times higher than the PI membrane, and its CO permeability was 16.25 Barrer, which exceeded the Robeson curve in 2008; the separation performance of the membrane was the best in this work.

摘要

咪唑离子液体（IL）对二氧化碳（CO₂）具有良好的亲和性和溶解性。这类离子液体与聚酰亚胺膜材料相结合，能够解决如今CO₂难以分离回收的问题。在本研究中，将不同含量的1-乙基-3-甲基咪唑四氟硼酸盐离子液体（IL₁）、1-戊基-3-甲基咪唑四氟硼酸盐离子液体（IL₂）、1-辛基-3-甲基咪唑四氟硼酸盐离子液体（IL₃）和1-十二烷基咪唑四氟硼酸盐离子液体（IL₄）添加到聚酰亚胺基体中，使用高速混合器制备了一系列与离子液体共混的聚酰亚胺膜。研究了这些膜的力学性能和气体分离渗透性。其中，PI/IL膜对CO₂/CH₄的选择性为180.55，比PI膜高2.5倍，其CO₂渗透率为16.25 Barrer，超过了2008年的罗伯逊曲线；该膜在本研究中的分离性能最佳。