Solvent resistant polyamide nanofiltration membranes
US10357746B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 18, 2016 |
| Grant date | Jul 23, 2019 |
| Priority date | — |
| Expiry date | Nov 18, 2036 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D71/64
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention relates to a composite membrane for nanofiltration of a feed stream solution comprising a solvent and dissolved solutes and showing preferential rejection of the solutes. The composite membrane comprises a thin polymeric film formed by interfacial polymerization on a support membrane. The support membrane is further impregnated with a conditioning agent and is stable in polar aprotic solvents. The composite membrane is optionally treated in a quenching medium, where the interfacial polymerization reaction can be quenched and, in certain embodiments, membrane chemistry can be modified. Finally the composite membrane is treated with an activating solvent prior to nanofiltration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.