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Gas permeability and selectivity through asymmetric polyimide membranes

✍ Scribed by Hiroyoshi Kawakami; Masato Mikawa; Shoji Nagaoka

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
659 KB
Volume
62
Category
Article
ISSN
0021-8995

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✦ Synopsis

Permeability and selectivity of CO,, O,, N,, and CH4 were determined for the asymmetric membrane of aromatic polyimide derived from 2,2'-bis(3,4-dicarboxyphenyl) hexafluoropropane dianhydride (6FDA) and 3,3'-diaminodiphenyIsuIfone (m-DDS) at 35Β°C and at pressure up to 76 cmHg. The average apparent skin layer thickness of all asymmetric membranes measured was 2.6 pm. The selectivities for (O,/N,) and (CO,/CH,) in the membranes were 11.5 at 0, permeance of 3.2 X [cm3(STP)/ cm2 s cmHg], respectively, without the necessity of an additional coating process. The average gas selectivities of the asymmetric membranes were much larger than those determined for the dense membranes. The effect of the microstructure of polyimide on the gas selectivity is discussed. 0

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