用PVP水解物制备CO_2固载膜及膜的性能

PREPARATION OF CO_2 FIXED CARRIER MEMBRANE BY PVP HYDROLYSATE AND ITS PERFORMANCE

以自由基聚合合成了聚乙烯基吡咯烷酮 (PVP) ,并用其水解产物聚N 乙烯基 γ 氨基丁酸钠 (PVSA)和聚砜 (PS)超滤膜制备了PVSA/PS复合膜 ;用红外光谱、X射线衍射等方法研究了PVP及其水解产物PVSA的结构 ,证实了PVSA含有可作为CO2 载体的仲胺基与羧基 ;测试了复合膜的透气性能及对CO2 /CH4的选择性 .结果表明 ,在 2 6℃ ,压力为 1333Pa时 ,CO2 渗透速率可达 5 4 6× 10 -7cm3 (STP)·cm-2 ·s-1·Pa-1,CO2 /CH4的理想分离因子达到 2 12 1.随着进料气压力的增大 ,CO2 /CH4的分离因子及CO2 的渗透速率均呈下降趋势 .依据膜的渗透通量随压力的变化特性以及不同状态下膜的红外光谱 ,分析了膜对CO2

Polyvinylpyrrolidone(PVP)was synthesized by the usual radical polymerization, and the composite membrane was prepared with PVP hydrolysate poly{N-vinyl-γ-sodium aminobutyrate}(PVSA) and polysulfone ultrafiltration membrane as its support. The structures of PVP and PVSA were investigated by infrared spectrum (IR) and X-ray diffraction (XRD).The permselectivities of the composite membrane for CO 2/CH 4 system were measured.The results show that at 26℃,1333Pa of gas pressure, the membrane displays a CO 2 permeation rate of 5.46×10 -7 cm 3(STP)·cm -2·s -1·Pa -1 and CO 2/CH 4 ideal selectivity of 212.1. With increasing pressure in feed gas, both CO 2 permeation rate and selectivity of CO 2/CH 4 decrease. The facilitated transport mechanism of CO 2 in membrane was analyzed according to the characteristics of permeation flux vs pressure and the infrared spectra of the membranes in different states.