用于CO_2分离的[bmim][Tf_2N]-PAN共混膜制备及性能  

Preparation and property of [bmim][Tf_2N]-PAN composite membrane for CO_2 separation

作　　者：曾庆瑞[1] 贺高红[1] 李祥村[1] 代岩[1] 黄湛[1] 郭慧敏[1] 

机构地区：[1]大连理工大学精细化工国家重点实验室膜科学与技术研发中心,辽宁大连116024

出　　处：《现代化工》2014年第8期87-90,92,共5页Modern Chemical Industry

摘　　要：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。Imidazolium-based ionic liquids have good CO2 solubility.The utilization of this kind of ionic liquids can enhance gas separation performance by improving both permeability and selectivity of CO2.In this study,1-butyl-3-methylimidazoliumbis （trifluoro-methylsulfonyl） imide （[bmim] [Tf2 N]） and polyacrylonitrile （PAN） are dissolved in N,N-dimethylformamide （DMF）.Then the homogeneous solution is casted and dried on the supported layer of polypropylene （PP） membrane.With the addition of [bmim] [Tf2N],the performance of the membrane is improved.When the content of [bmim] [Tf2N] is over 50％,ionic liquid becomes continuous phase gradually and CO2 permeation can reach 34.76 GPU.The ideal separation factor of CO2/N2 and CO2/CH4 are 49.51 and 25.14,respectively.With the increase of trans-membrane pressure and test temperature,the permeability of [bmim] [Tf2N]-PAN/PP composite membrane increases.

关 键 词：CO2分离 离子液体 聚丙烯腈 共混复合膜 

分 类 号：TQ028.8[化学工程]