| 摘要 |
The present invention provides a method for fabricating an asymmetric fluoropolymer membrane comprised of a fluoropolymer material, the membrane having a first surface comprised of a dense layer of the fluoropolymer material, and an opposite second surface comprised of a porous layer of the fluoropolymer material, comprising the steps of: (a) dissolving a fluoropolymer material in a solvent to form a solution; (b) depositing the solution on a casting surface; and (c) removing the solvent from the solution, thereby precipitating the membrane therefrom. The present invention also provides asymmetric fluoropolymer membranes comprised of a fluoropolymer material, wherein the membrane has a first surface comprised of a dense layer of the fluoropolymer material, and an opposite second surface comprised of a porous layer of the fluoropolymer material, and provides compositions for making the same. The present invention further provides a method for separating one or more organic compounds from a mixture of organic compounds or one or more organic compounds from water by pervaporation or vapor permeation, comprising the steps of: (a) placing an asymmetric fluoropolymer membrane comprised of a fluoropolymer material into a suitable pervaporation or vapor permeation apparatus such that the membrane forms a selectively permeable barrier to one or more compounds of the mixture, the membrane having a first surface comprised of a dense layer of the fluoropolymer material, and an opposite second surface comprised of a porous layer of the fluoropolymer material; (b) contacting the first surface of the membrane with the mixture; and (c) transporting permeate through the membrane by creating a difference in the partial pressure of the compounds between the first and second surfaces of the membrane.
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