Semipermeable membranes
US4828708A · kind A · utility
21Cited by
1References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 28, 1987 |
| Grant date | May 9, 1989 |
| Priority date | — |
| Expiry date | Sep 28, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D71/56
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A reverse osmosis membrane with excellent nitrate rejection that is particularly suitable for point-of-use drinking water purposes. The reverse osmosis membrane is a composite material comprising a porous support layer and an ultrathin polyamide desalinizing layer which is the interfacial condensation reaction product of (a) meta-phenylenediamine and (b) a mixture of a major portion of isophthaloyl chloride and a minor proportion of trimesoyl chloride.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.