氨基酸离子液体/Pebax膜的制备及CO_(2)分离测试

Preparation of Amino Acid Ionic Liquid/Pebax Blend Membranes and Separation of CO_(2)

为了提高聚醚共聚酰胺(Pebax1657)的CO_(2)分离性能,利用氨基酸离子液体(AAIL)改性Pebax材料制备AAIL/Pebax共混膜,通过红外分析、热重分析、差示扫描量热、X射线衍射对AAIL/Pebax膜进行表征。结果表明,AAIL与Pebax发生物理共混,AAIL的加入提高了膜的热稳定性能。对CO_(2)进行气体分离性能测试,确定了氨基酸离子液体的含量、操作压力和温度对气体渗透性能的影响。结果表明,氨基酸离子液体的加入使得CO_(2)的渗透性和CO_(2)/N_(2)选择性均有所提升,当AAIL的质量分数为0.8%时,CO_(2)的渗透系数为101.03 Barrer、CO_(2)/N_(2)选择性为91.84,达到最优,对比Pebax1657纯膜CO_(2)的渗透系数提高了66.47%,CO_(2)/N_(2)选择性提高了86.14%,突破了2008年Robeson上限。

In order to improve the CO_(2) separation performance of polyether copolyamide(Pebax) membrane,amino acid ionic liquid(AAIL) was synthetized and used to prepare AAIL/Pebax blended membranes.The AAIL/Pebax membranes were characterized by FT-IR,TGA,DSC and XRD.And the CO_(2) gas separation performance test was performed so as to determine the influence of the content of amino acid ionic liquid,operating pressure and temperature on gas permeability.The results show that the permeability of CO_(2) and selectivity of CO_(2)/N_(2) are improved with adding amino acid ionic liquid.The permeability coefficient of CO_(2) is 101.03 Barrer,and the selectivity of CO_(2)/N_(2) is 91.84 when the AAIL mass fraction is 0.8%.Compared with the pristine Pebax1657membrane,the permeability coefficient of CO_(2) is increased by 66.47%,and the selectivity of CO_(2)/N_(2) is increased by86.14%,exceeding the 2008 Robeson’ s upper bound.