Solvent resistant asymmetric integrally skinned membranes
OwnerRichard CRANFORD, Christian ROYinventors
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Abstract
There is provided an asymmetric integrally skinned membrane comprising a polyimide and another polymer selected from the group consisting of polyvinylpyrrolidone, sulfonated polyetheretherketones and mixtures thereof. The membrane which is substantially insoluble in an organic solvent and substantially defect-free can be useful as a separation membrane. Methods for preparing asymmetric integrally skinned polyimide membranes are also disclosed
Claims21
1-36. (canceled)
A method for purifying natural gas, said method comprising contacting the natural gas with at least one substantially defect-free and substantially insoluble in an organic solvent asymmetric integrally skinned membrane comprising a polyimide and another polymer chosen from polyvinylpyrrolidone, sulfonated polyetheretherketones and mixtures thereof.
A method for concentrating a composition comprising an organic compound and water, or a gas and water, said method comprising contacting the composition with at least one substantially defect-free and substantially insoluble in an organic solvent asymmetric integrally skinned membrane comprising a polyimide and another polymer chosen from polyvinylpyrrolidone, sulfonated polyetheretherketones and mixtures thereof, thereby at least partially removing water from said composition.
Dependencies are inferred from the claim text.