Process of producing composite semipermeable membrane
US5051178A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 7, 1989 |
| Grant date | Sep 24, 1991 |
| Priority date | — |
| Expiry date | Sep 7, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D69/125
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Alkyldiamine, 1,3,5-trihydroxybenzene or 1,3-dihydroxybenzene is added as a copolymerization component to a polyfunctional aromatic amine component in the amount of 1-20% by weight with respect to the polyfunctional aromatic amine in producing a composite semipermeable membrane by laminating on a microporous substrate a polyamide formed by interfacial polycondensation between a polyfunctional aromatic amine and a polyfunctional acid halide. The composite semipermeable membrane has improved oxidation resistance while retaining excellent separation selectivity and high permeability of the crosslinked polyamide-based composite semipermeable membrane. The composite semipermeable membrane is used for desalination of brackish and sea water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.