Preparation and characterization of silica-polyimide composite membranes coated on porous tubes for CO2 separation

被引:116
作者
Kusakabe, K [1 ]
Ichiki, K [1 ]
Hayashi, J [1 ]
Maeda, H [1 ]
Morooka, S [1 ]
机构
[1] KYUSHU UNIV,DEPT CHEM SCI & TECHNOL,HIGASHI KU,FUKUOKA 81281,JAPAN
关键词
composite membrane; gas separation; carbon dioxide; silica; polyimide;
D O I
10.1016/0376-7388(95)00290-1
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Silica-polyimide microcomposite membranes were prepared on gamma-alumina-coated alpha-alumina support tubes, and their gas permeation properties were evaluated with He, N-2 and CO2. Smoothing of the substrate surface and hybridization of silica and polyamic acid were both effective to form defect-free thin composite membranes. The CO2 permeance of a membrane with a silica content of 68 wt% was one order of magnitude higher than that of a polyimide membrane having the same thickness. The permselectivity of CO2 to N-2 was 30 at 30 degrees C and 13 at 100 degrees C. Contributions of the silica and polyimide phases to permeance of the composite membrane were analyzed with a two-phase permeation model. The effective thickness of the rate-controlling polyimide phase was less than one-tenth of the total thickness of the silica-polyimide membrane.
引用
收藏
页码:65 / 75
页数:11
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