Preparation of poly(phenylene oxide) asymmetric gas separation membranes
First Claim
1. A process for preparing an integrally-skinned asymmetric poly(phenylene oxide) gas separation membrane comprising, forming a solution of from 5 to 50 weight percent of film forming molecular weight poly(2,6-dimethylphenylene-1,4-oxide) in a solvent mixture comprising a main constituent of an aprotic solvent at from 50°
- C. to 200°
C.,forming said solution into a nascent membrane,partially drying said nascent membrane for 0.005 to 10 minutes at 20°
C. to 200°
C., andprecipitating said nascent membrane in a coagulation bath at 0°
C. to 80°
C., said coagulation bath being a non-solvent for the poly(phenylene oxide) while being miscible with the main constituent of the solvent mixture.
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Abstract
A process for producing integrally-skinned asymmetric poly(phenylene oxide) gas separation membranes is disclosed. The process involves forming a solution of the poly(phenylene oxide) in an aprotic solvent at an elevated temperature, forming a nascent membrane from the solution, partially drying the nascent membrane, followed by coagulating the partially dried nascent membrane in a coagulation bath formed from a non-solvent for the poly(phenylene oxide) which non-solvent is miscible with the aprotic solvent.
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Citations
27 Claims
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1. A process for preparing an integrally-skinned asymmetric poly(phenylene oxide) gas separation membrane comprising, forming a solution of from 5 to 50 weight percent of film forming molecular weight poly(2,6-dimethylphenylene-1,4-oxide) in a solvent mixture comprising a main constituent of an aprotic solvent at from 50°
- C. to 200°
C.,forming said solution into a nascent membrane, partially drying said nascent membrane for 0.005 to 10 minutes at 20°
C. to 200°
C., andprecipitating said nascent membrane in a coagulation bath at 0°
C. to 80°
C., said coagulation bath being a non-solvent for the poly(phenylene oxide) while being miscible with the main constituent of the solvent mixture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
- C. to 200°
Specification