用PVP水解物制备CO2固载膜及膜的性能

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26℃，压力为1333Pa时，CO₂渗透速率可达5.46×10^-7 cm³(STP)•cm^-2•s^-1•Pa^-1，CO₂/CH₄的理想分离因子达到212.1.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的促进传递机理.

PREPARATION OF CO2 FIXED CARRIER MEMBRANE BY PVP HYDROLYSATE AND ITS PERFORMANCE

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 CO₂/CH₄ system were measured.The results show that at 26℃，1333Pa of gas pressure, the membrane displays a CO₂ permeation rate of 5.46×10^-7 cm³(STP)•cm^-2•s^-1•Pa^-1 and CO₂/CH₄ ideal selectivity of 212.1. With increasing pressure in feed gas, both CO₂ permeation rate and selectivity of CO₂/CH₄ decrease. The facilitated transport mechanism of CO₂ in membrane was analyzed according to the characteristics of permeation flux vs pressure and the infrared spectra of the membranes in different states.