Composite membrane and method for making the same
US6723241B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 2, 2001 |
| Grant date | Apr 20, 2004 |
| Priority date | — |
| Expiry date | Nov 2, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D71/56
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A composite membrane and method for making the same, comprising a porous support and a crosslinked polyamide surface. The subject membrane provides improved flux and/or rejection rates. The subject membrane is further capable of operating at lower operating pressures. The subject method includes reacting a polyfunctional amine with a polyfunctional acyl halide to form a polyamide. The method includes the step of contacting a phosphorous containing compound with the polyfunctional acyl halide prior to and/or during the reaction between the polyfunctional acyl halide and a polyfunctional amine. The subject process is easily adapted to commercial scale manufacturing processes and is particularly suited for making nanofiltration and reverse osmosis composite membranes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.