Matrimid5218/PSf双层非对称中空纤维膜的制备及其气体分离性能研究

Fabrication of Dual-layer Matrimid~/PSf Hollow Fiber Membrane and Its Gas Separation Performance

以商业化聚酰亚胺Matrimid5218作为功能层材料,聚砜作为支撑层材料,采用共挤出法制备双层非对称中空纤维气体分离膜.所制备的双层非对称中空纤维膜具有致密无缺陷的超薄皮层,致密皮层厚度约为0.21μm.在25℃,0.5 MPa下,CO2/CH4的选择性系数达51.39,CO2的渗透系数为46.29 GPU,O2/N2的选择性系数达到7.13,O2的渗透速率为6.38 GPU.考察了温度和压力对膜的渗透系数和选择性系数的影响,并考察了物理老化对膜性能的影响.

Dual-layer Matrimid /PSf hollow fiber membranes for gas separation were fabricated via co-extrusion technology. The hollow fiber membranes have an ultrathin dense-selective layer of 0.21 μm. The hollow fiber membranes have a CO2 permeance of 46.29 GPU with a CO2/CH4 selectivity coefficient of 51.39 at 25 ℃ and 0.5 MPa. And the hollow fiber membranes have an O2 permeance rate of 6.38 GPU with an O2/N2 selectivity coefficient of 7.13 at 25 ℃ and 0. 5 MPa. The effects of the test temperature and the feed pressure on the gas separation performance were investigated. Finally, the aging phenomena were investigated.