Composite polyamide membrane made via interfacial polymerization using a blend of non-polar solvents

摘要

A method for making a composite polyamide membrane comprising a porous support and a thin film polyamide layer, wherein the method includes: i) applying a polar solution comprising a polyfunctional amine monomer, and a non-polar solution comprising a polyfunctional acyl halide monomer to a surface of a porous support and interfacially polymerizing the monomers to form a thin film polyamide layer, wherein the non-polar solution further comprises at least 50 vol % of a C₅ to C₂₀ aliphatic hydrocarbon and from 2 to 25 vol % of benzene or benzene substituted with one or more C₁ to C₆ alkyl groups; and ii) applying an aqueous solution of nitrous acid to the thin film polyamide layer.