Composite polyamide membrane post-treated with nitrous acid

• Main Authors: STEVENS DEREK M, TOMLINSON IAN A, ROY ABHISHEK, PAUL MOU
• Format: Patent
• Language: Chinese; English
• Published: 22.02.2017
• Subjects: PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING

A method for making a composite polyamide membrane including a porous support and a thin film polyamide layer, wherein the method includes: 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; and exposing the thin film polyamide layer to nitrous acid; and wherein the method is characterized by treating the thin film polyamide layer with a halogenated benzene compound represented by formula (a) wherein: X is selected from a halogen; Y is selected from hydrogen, carboxylic acid, sulfonic acid; and A, A', A" and A'" are independently selected from: halogen, hydrogen, hydroxyl, alkoxy, ester, amino, keto-amide, and an alkyl group with the proviso that at least one of A, A', A" and A'" is selected from: hydroxyl, amino, keto-amide, and wherein the substituent in the ortho or para to at least one of A, A', A" and A'