Gas separating composite membrane and process for producing the

Details Gas separating composite membrane and process for producing the Gas separating composite membrane and process for producing the

1995-06-07

1997-07-15

Spitzer, Robert

Gas separation: apparatus

Apparatus for selective diffusion of gases

Plural layers

96 11, 96 14, 55DIG5, B01D 5322

Patent

active

056478941

ABSTRACT:
A gas separating composite membrane comprising two types of polyimide resin layers having different molecular structures and each having solubility in an organic solvent different from each other, the two layers being laminated being substantially independent or via a mixed layer, the first polyimide resin layer comprising a porous polyimide supporting membrane having a nitrogen gas permeation flux density at 25.degree. C. of at least 2 Nm.sup.3 /m.sup.2 /h/atm., and the second polyimide resin layer, which contributes to a gas separating performance comprising a fluorine-containing polyimide thin film containing at least three fluorine atoms in a repeating molecular structure unit which constructs the second polyimide resin layer has a very high gas permeation flux density while maintaining a high gas permeability, excels in heat resistance and chemical resistance, and satisfies a practical use in terms of cost.

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