Process for the preparation of asymmetric TPX porous membranes for gas separation
AssigneeNational Science Council
InventorsJuin-Yih Lai, Fung-Ching Lin
Life of this patent
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Abstract
Asymmetric TPX porous membranes for gas separation are prepared by wet, and dry/wet phase inversion methods. A casting polymer solution including TPX, a selected solvent and optionally a selected non-solvent, is casted on a support, and within 100 seconds after the casting step, the casted polymer is immersed in a coagulant to form a membrane. The formed membrane is extracted, dried and optionally heat treated.
Claims19
A process for preparing an asymmetric poly(4-methyl-pentene-1) porous membrane for separation, comprising:
- (a) preparing a casting polymer solution comprising poly(4-methyl-pentene-1) and a solvent selected from the group consisting of cyclohexane, cyclohexene, trichloromethane, tetrachloromethane and mixtures thereof;
- (b) casting said casting polymer solution on a support;
- (c) immersing within 100 seconds after the casting of step (b) the casted polymer together with the support in a nonsolvent coagulant comprising an alcohol to form a membrane;
- (d) extracting the membrane;
- and
- (e) drying the membrane.
The method as claimed in 1, further comprising subjecting the dried membrane to a heat treatment at 25.degree.-150.degree. C. for 1-12 hours.
Dependencies are inferred from the claim text.