咪唑鎓化聚醚砜CO2固定载体分离膜的初探

摘要

Imidazolium-functionalized polyethersulfone (ImPES), a material for CO2 separation, was successfully synthesized. Subsequently, a fixed-carrier composite membrane was prepared with ImPES as the active layer and Polypropylene (PP) micro-filtration membrane as the support layer. The effects of degree of Imidazolium (DIm), ImPES concentration, test temperature and pressure on the performance of the membrane were investigated. Measurements carried out with humid feed revealed the performance of ImPES/PP membrane was improved with the increase of DIm. ImPES/PP membrane sample of 64%DIm and 20%ImPES concentration showed a CO2 permeation rate of 23.92 GPU and a CO2/N2 ideal separation factor of 65.34 in the test conditions of 30℃ and 0.4MPa.%通过化学改性的方法以氯甲基辛基醚（CMOE）、1-甲基咪唑（MIm）和聚醚砜（PES）为材料制备了咪唑鎓化聚醚砜（ImPES），并以其为分离层，聚丙烯（PP）为支撑层制备了用于CO2分离的固定载体复合膜。考察了咪唑鎓化程度、聚合物浓度、操作温度和压力对ImPES/PP复合膜性能的影响。结果表明，咪唑鎓化程度（DIm）对复合膜的性能影响最大，随着咪唑鎓化程度的提高，特别是当DIm大于50%后，复合膜对CO2的分离性能有很大提高。当取代度DIm为64%、聚合物质量分数为20%、测试温度为30℃、压力为0.4MPa时，ImPES/PP复合膜的纯CO2渗透速率为23.92GPU，CO2/N2理想分离因子为65.34。