Fluorine-containing polyimide gas separation membrane and method

Details Fluorine-containing polyimide gas separation membrane and method Fluorine-containing polyimide gas separation membrane and method

1996-06-13

1998-10-06

Spitzer, Robert

Gas separation: apparatus

Apparatus for selective diffusion of gases

96 8, 96 13, 96 14, 55524, 55DIG5, B01D 5322

Patent

active

058171657

ABSTRACT:
A fluorine-containing polyimide gas separation membrane which is pinhole-free, uniform over a large area, and has a high permeability and a high separation factor .alpha. is provided. A polyimide resin is dissolved in at least one solvent selected from the group consisting of an organic solvent (A) or (B). The organic solvent (A) has a dielectric constant of 30 or less and a dipole moment of 3.0 D or less. The organic solvent (B) mainly contains an organic solvent having at least one ether bonding in the molecular unit. In the next step, the polyimide resin is dipped in a solvent (C) in order for desolvation. The solvent (C) does not dissolve the fluorine-containing polyimide resin while it is miscible with the organic solvent (A) or (B). As a result, an asymmetric gas separation membrane is formed. The fluorine-containing polyimide resin layer comprises a skin layer the thickness L.sub.1 thereof is about 40 nm and a sponge like layer the thickness L.sub.2 thereof is about 30 .mu.m. The membrane is formed on a supporter of, for example, a nonwoven cloth.

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