Abstract
Permeability and selectivity of CO 2 , O 2 , N 2 , and CH 4 were determined for the asymmetric membrane of aromatic polyimide derived from 2,2'-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) and 3,3'-diaminodiphenylsulfone (m-DDS) at 35°C and at pressure up to 76 cmHg. The average apparent skin layer thickness of all asymmetric membranes measured was 2.6 μm. The selectivities for (O 2 /N 2 ) and (CO 2 /CH 4 ) in the membranes were 11.5 at O 2 permeance of 3.2 X 10 -7 and 153 at CO 2 of 6.3 X 10 -7 [cm 3 (STP)/cm 2 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.
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