High performance composite membrane
US6132804A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 5, 1998 |
| Grant date | Oct 17, 2000 |
| Priority date | — |
| Expiry date | Jun 5, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05D1/36
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for producing high quality reverse osmosis, nanofiltration, and ultrafiltration membranes in a high speed process provides membranes which have excellent rejection characteristics coupled with high flux capabilities. The process employs tandem coating techniques to coat a microporous substrate with a thin membrane on the order of 25 .ANG. to 1.0 microns. The tandem coating process comprises tandem offset gravure and subsequent slot die coating applicators, or alternatively comprises tandem slot die coating applicators. For reverse osmosis and nanfiltration membranes, a wet-on-wet coating process is used to coat a porous substrate first with an aqueous solution, and then with an organic solution to produce a cross-linked, interfacially polymerized composite membrane. Single slot coating applicators are utilized to produce ultrafiltration membranes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.