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Development of high-performance membranes for CO_2

CO_2高性能膜的开发

基本信息

批准号：
05555212
负责人：
OKAMOTO Kenichi
金额：
$ 5.7万
依托单位：
Yamaguchi University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

项目摘要

Poly(ether impede)segmented copolymers were prepared from polyether diamine and comonomer diamine with acid anhydride. They have microphase-separated structure consisting of microdomaims of rubbery polyether segments and of glassy polyimide segments. The gas permeation occurs through polyether segment microdomains and polyimide segment microdomains contributes to mechanical properties and film-forming ability. The polyethlene oxide(PEO)-based copolymers displayd very high performance for CO_2/N_2 separation, permeability coefficient to CO_2, P_<CO2>=1.4x10^<-8> cm^3(STP)cm^2/(cm scmHg) and permeability ratio of CO_2 over N_2, P_<CO2>/P_<N2>=70 at 298K.Composite hollow fiber membranes, which were composed of surface layr of PEO-based polyimide and supporting sponge layr of BPDA-based polyimide, were prepared by using a double-layred injection nozzle. The outer diameter of the hollow fibers was 300 mum and the thickness of the surface layr was 2mum. Laboratory-scale modules of the hollow fiber membranes displayd high performance for CO_2/N_2 separation, permeation rate to CO2, R_<CO2>=2.9x10^<-5> cm^3(STP)/(cm2 s cmHg) and permeation ratio, RCO_2/RN_2=42 at 323K.BPDA-TrMPD polyimide with high permeability and low permselectivity was brominated and then reacted with aliphatic amine. The chemically modified polyimides thus prepared displayd, P_<CO2>=1x10^<-8> cm^3 (STP) cm^2/(cm s cmHg) and separation factor alpha=35for dry CO_2/N_2 mixtures, and P_<CO2>=0.7x10^<-8> cm^3 (STP) cm^2/(cm s cmHg) and separation factor alpha=50-60 for wet CO_2/N_2 mixtures at 308K.Assymmetric hollow fiber membranes of the chemically modified polyimide are expected to display very excellent performace for wet CO_2/N_2 mixtures.

以聚醚二胺和共聚二胺为原料，采用酸酐法合成了聚醚嵌段共聚物。它们具有由橡胶状聚醚链段和玻璃状聚酰亚胺链段的微区组成的微相分离结构。气体通过聚醚链段微区和聚酰亚胺链段微区渗透，有助于力学性能和成膜能力。聚氧化乙烯（PEO）基共聚物具有很高的CO_2/N_2分离性能，在298 K下，CO_2渗透系数P_<CO2>= 1.4 × 10 ~<-8>（-3）cm ~ 2/（cm scmHg），CO_2/N_2渗透比P_<CO2>/P_<N2>=70。中空纤维的外径为300 μ m，表面层的厚度为2 μ m。在323 K时，对CO_2的渗透速率R_<CO2><-5>（STP）/（cm ~ 2·s·cm ~（Hg））为2.9 × 10 ~（-3）cm ~ 3，渗透比RCO_2/RN_2为42。在<CO2>308 K下，对<-8>干CO_2/N_2混合气，P_（STP）= 1 × 10 ~（^cm ~ 2）/（cm s cm Hg），分离因子α = 35;对湿CO_2/N_2混合气，P_（STP）<CO2>= 0.7 × 10 ~<-8>（^cm ~ 2）/（cm s cm Hg），分离因子α =50-60。