化工新型材料

化工新型材料 ›› 2023, Vol. 51 ›› Issue (10) : 102-107. DOI: 10.19817/j.cnki.issn1006-3536.2023.10.045

新材料与新技术

聚酰亚胺/离子液体共混膜的制备及其CO₂/N₂分离性能研究

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Preparation of polyimide/ionic liquid hybrid membrane and its CO₂/N₂ separation performance

Zhao Shijun, Jia Hongge, Xu Shuangping, Zhang Mingyu, Qu Yanqing, Zha Yuxin

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文章历史 +

Received		Published
2022-06-07		2023-10-20
Issue Date	Revised Date
2023-10-27	2022-06-07

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摘要

咪唑类离子液体(IL_s)对CO₂具有良好的亲和性和溶解性。离子液体与聚酰亚胺膜材料相结合,可以解决目前CO₂难以分离和回收的问题。选用3种烷基链长度不同的离子液体与聚酰胺酸进行共混,通过高速搅拌器制备出一系列聚酰亚胺/离子液体共混膜,IL_n含量为5%、10%、15%、20%。采用薄膜拉伸强度测试仪和气体透过仪对膜进行了测试。结果表明:离子液体共混的聚酰亚胺薄膜的力学性能相对于纯膜来说均有所提高。当离子液体为IL₂,共混含量为20%时,膜对CO₂的渗透性能最好,为1.5033Barrer,是纯膜的3倍;当离子液体为IL₂,共混含量为15%时,膜对CO₂/CH₄的分离性能最好,为21.7859,约为纯膜的7倍。

Abstract

Imidazole-based ionic liquids (IL_s) have good affinity and solubility for carbon dioxide (CO₂).The combination of ionic liquid and polyimide membrane material can solve the problem that CO₂ is difficult to separate and recover at present.Three ionic liquids with different alkyl chain lengths were selected and blended with polyamide acid to prepare a series of polyimide/ionic liquid blend membranes with IL_n contents of 5%,10%,15%,20% by a high-speed stirrer.The membranes were tested using a membrane tensile strength tester and a gas permeation meter.The results showed that the mechanical properties of polyimide membranes blended with ionic liquids were improved compared with pure membrane.When the ionic liquid was IL₂ and the blending content was 20%,the permeability of the membrane to CO₂ was the best,reaching 1.5033Barrer,which was three times that of the pure membrane;when the ionic liquid was IL₂ and the blending content was 15%,the membrane had the best separation performance for CO₂/N₂,which reaching 21.7859,which was approximately seven times that of pure membrane.

关键词

聚酰亚胺 / 离子液体 / 气体分离膜 / 分离渗透性能

Key words

polyimide / ionic liquid / gas separation membrane / separation permeability

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聚酰亚胺/离子液体共混膜的制备及其CO₂/N₂分离性能研究[J]. 化工新型材料, 2023, 51(10): 102-107 DOI:10.19817/j.cnki.issn1006-3536.2023.10.045

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