咪唑类离子液体(ILs)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,ILn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。
Imidazole-based ionic liquids (ILs) 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 ILn 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.
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