Composite polyamide membrane post-treated with nitrous acid
US9943810B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 5, 2015 |
| Grant date | Apr 17, 2018 |
| Priority date | — |
| Expiry date | May 5, 2035 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2323/40
- 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 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 polyamide layer; and ii) exposing the thin film polyamide layer to nitrous acid; wherein the method is characterized by at least one of: conducting the interfacial polymerization of step i) in the presence of a subject amine compound, or applying a subject amine compound to the interfacially polymerized polyamide layer prior to step ii), wherein the subject amine compound is different from the polyfunctional acyl halide and polyfunctional amine monomers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.