Separation performance of polyimide composite membrane prepared by dip coating process

被引:54
作者
Yanagishita, H
Kitamoto, D
Haraya, K
Nakane, T
Okada, T
Matsuda, H
Idemoto, Y
Koura, N
机构
[1] Natl Inst Mat & Chem Res, Tsukuba, Ibaraki 3058565, Japan
[2] Sci Univ Tokyo, Dept Ind Chem, Chiba 2788510, Japan
关键词
dip coating; composite membrane; polyimide; poly(amic acid)tri-ethylamine salt; preparation;
D O I
10.1016/S0376-7388(01)00337-4
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The effects of the preparation conditions in a dip coating process on polyimide composite membranes have been investigated. Polyimide precursor obtained from pyromellitic dianhidride (PMDA) and 4,4'-oxydianiline (ODA) was mixed with triethylamine and poly(amic acid)tri-ethylamine salt (PAA salt) was made. An asymmetric polyimide membrane (PI-2080) as a supporting membrane was dipped in a PAA salt (concentration 0-5 wt.%) methanol solution. The coating layers of PAA salt were converted to these of polyimide by annealing at 200 degreesC for 3 h in an ordinary vacuum oven. The performance of the polyimide composite membrane was evaluated by gas permeation (N-2, O-2, CO2, at 1 kg/cm(2)) and pervaporation (feed: a 95 vol.% ethanol aqueous solution at 30-60 degreesC). The composite membranes prepared using a coating solution of 5 wt.% PAA salt showed the CO2/N-2 selectivity of over 25 on gas permeation, and separation factor alpha (H-2 O/EtOH) of over 800 with a total flux of 0.21 kg/m(2) h on pervaporation. (C) 2001 Elsevier Science B.V. All nights reserved.
引用
收藏
页码:165 / 172
页数:8
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