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用于CO2分离的[bmim][Tf2N]-PAN共混膜制备及性能

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Indexed by:期刊论文

Date of Publication:2014-08-20

Journal:现代化工

Included Journals:Scopus、PKU、ISTIC、CSCD

Volume:34

Issue:8

Page Number:87-90,92

ISSN No.:0253-4320

Key Words:CO2分离;离子液体;聚丙烯腈;共混复合膜

Abstract:咪唑类离子液体对CO2有良好的溶解性,利用其进行气体分离可以同时提高膜对CO2的选择性和渗透性.利用1-丁基-3-甲基咪唑双三氟甲磺酰亚胺([bmim] [Tf2N])离子液体对CO2具有较高的溶解选择性,将[bmim][Tf2N]和聚丙烯腈(PAN)共混制备膜液,涂覆在聚丙烯(PP)支撑层上,利用溶剂蒸发法制备共混复合膜.结果表明,[bmim][Tf2N]的添加对复合膜气体分离性能有明显提高,在离子液体质量分数达到50%后,离子液体逐渐变为连续相,增加了CO2气体的传递通道;气体渗透性能显示其CO2渗透速率可达34.76 GPU,CO2/N2和CO2/CH4理想选择性分别可达49.51和25.14;在随后改变操作压力和测试温度的实验中发现,增大跨膜压差和测试温度均有利于复合膜渗透速率的提升.

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