Patent ID: 9079138
Filing Date: 2015-07-14
Classification: B01D

Abstract:
1. A selectively permeable membrane formed by the process comprising the steps of: (A) providing a polymeric composition comprising repeating units of a polymerized perfluorinated monomer, (B) dissolving the polymeric composition in a liquid medium, thereby forming a membrane casting solution, (C) depositing the casting solution onto a support structure to form thereon a membrane precursor that comprises a residual amount of the liquid medium within the membrane precursor, (D) optionally draining free-flowing membrane casting solution from the membrane precursor, and (E) removing from the membrane precursor a fraction of the residual amount of the liquid medium effective to produce a nonporous selectively permeable membrane which has a pressure normalized solvent flux (PNSF) for N-hexane of at least 23 Lm