Composite polyamide membrane treated with dihyroxyaryl compounds and nitrous acid
US9452391B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 29, 2014 |
| Grant date | Sep 27, 2016 |
| Priority date | — |
| Expiry date | Oct 29, 2034 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2325/20
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for making a composite polyamide membrane comprising a porous support and a polyamide layer, including the steps of: i) applying a polar solution including a polyfunctional amine monomer and a non-polar solution including a polyfunctional acyl halide monomer to a surface of a porous support and interfacially polymerizing the monomers to form a polyamide layer; ii) applying a dihydroxyaryl compound to the polyamide layer, wherein the dihydroxyaryl compound is represented by: formula wherein D, D′, D″ and D′″ are independently selected from: alkyl, alkoxy, hydrogen, halogen, hydroxyl and amine, and L is a linking group; and iii) exposing the thin film polyamide layer to nitrous acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.