초록 ▼

The separation factor with respect to a gas binary of a selectively gas permeable membrane of a fluoropolymer can be increased by fabricating the membrane from a composition of a blend of the fluoropolymer with a nonfugitive, nonpolymeric fluorinated adjuvant. The composition can be made by dissolvi

The separation factor with respect to a gas binary of a selectively gas permeable membrane of a fluoropolymer can be increased by fabricating the membrane from a composition of a blend of the fluoropolymer with a nonfugitive, nonpolymeric fluorinated adjuvant. The composition can be made by dissolving the adjuvant and the polymer in a suitably compatible solvent then forming the membrane from the solution for example by casting, dipping, or spraying the solution on a substrate and devolatilizing the solvent. The extent of the selectivity increase varies widely with the combination of fluoropolymer and adjuvant and largely increases in direct relation with the proportion of adjuvant in the membrane composition. Novel membranes of fluoropolymers adapted for separation of chemically aggressive gases can be made to have higher selectivity than previously available from the adjuvant free fluoropolymers

대표청구항 ▼

1. A process for separating gases present in a gas mixture comprising contacting the gas mixture with one side of a selectively gas permeable membrane having a membrane separation factor with respect to two gases in the mixture, the membrane comprising a blend of a major fraction of a fluoropolymer

1. A process for separating gases present in a gas mixture comprising contacting the gas mixture with one side of a selectively gas permeable membrane having a membrane separation factor with respect to two gases in the mixture, the membrane comprising a blend of a major fraction of a fluoropolymer of which a nonporous membrane exhibits a fluoropolymer separation factor with respect to the two gases, and an amount of a nonfugitive, nonpolymeric fluorinated adjuvant having an atmospheric boiling point at least about 200.degree. C., the amount being effective to make the membrane separation factor greater than the fluoropolymer separation factor.