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将金属有机骨架化合物Cu3(BTC)2填充到聚二甲基硅氧烷中,制备聚二甲基硅氧烷/聚醚酰亚胺改性复合膜,用于气体分离的研究。考察了操作温度和压力对CO2、CH4、O2和N2在改性复合膜中的渗透系数、扩散系数、溶解度系数和分离系数的影响。结果表明,填充Cu3(BTC)2可降低气体的渗透活化能、扩散活化能和膜的压缩效应,进而提高气体的扩散性能和渗透性能;Cu3(BTC)2改性复合膜在低温条件下可得到较高的渗透性能和分离性能,较高压力可在不降低膜分离性能的基础上提高其渗透性能。
The metal-organic framework compound Cu3 (BTC) 2 was filled into polydimethylsiloxane to prepare a polydimethylsiloxane / polyetherimide modified composite membrane for the study of gas separation. The effects of operating temperature and pressure on the permeability, diffusion coefficient, solubility coefficient and separation coefficient of CO2, CH4, O2 and N2 in the modified composite membrane were investigated. The results show that Cu3 (BTC) 2 can reduce the activation energy, diffusion activation energy and the compression effect of the membrane, thus improving the gas diffusion and permeability. Cu3 (BTC) 2 modified composite membrane can be used at low temperature Get higher permeability and separation performance, higher pressure can improve the permeability without increasing the membrane separation performance.