Gas permeation and separation properties of sulfonated polyimide membranes
Gas permeation and separation properties of sulfonated polyimide membranes
复制标题
DOI：
10.1016/j.polymer.2006.04.001
复制
发表时间：
2006-05
期刊：
影响因子：
4.6
通讯作者：
Kazuhiro Tanaka;M. Islam;Masayoshi Kido;H. Kita;K. Okamoto
中科院分区：
文献类型：
--
作者：
Kazuhiro Tanaka;M. Islam;Masayoshi Kido;H. Kita;K. Okamoto
Permeability and selectivity of pure gas H2, CO2, O2, N2and CH4as well as a mixture of CO2/N2for sulfonated homopolyimides prepared from 1,4,5,8-naphthalene tetracarboxylic dianhydride (NTDA) and 2,2-bis[4-(4-aminophenoxy)phenyl] hexafluoro propane disulfonic acid (BAPHFDS) were measured and compared to those of the non-sulfonated homopolyimide having the same polymer backbone. The polyimide in a proton form (NTDA–BAPHFDS(H)) displayed higher selectivity of H2over CH4without loss of H2permeability. Strong intermolecular interaction induced by sulfonic acid groups decreased diffusivity of the larger molecules. The CO2/N2(19/81) mixed gas permeation was investigated as a function of humidity. With increasing relative humidity from 0% RH to 90% RH, the CO2permeability for NTDA–BAPHFDS(H) polyimide increased by more than one order of magnitude, and the selectivity of CO2/N2also increased twice or more. On the other hand, the gas permeability for the non-sulfonated polyimide slightly decreased with increasing humidity. NTDA–BAPHFDS(H) polyimide displayed a CO2permeability of 290×10−10cm3(STP) cm/(cm2scmHg) and a separation factor of CO2/N2of 51 at 96% RH, 50°C and total pressure of 1atm.
