Composite reverse osmosis membrane having active layer of aromatic polyester or copolymer of aromatic polyester and aromatic polyamide
US5593588A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 8, 1995 |
| Grant date | Jan 14, 1997 |
| Priority date | — |
| Expiry date | Dec 8, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D71/56
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A composite reverse osmosis membrane may advantageously be prepared by the process comprising applying porous support layer onto a nonwoven fabric and then forming an ultrathin active layer of an aromatic polyester superposed thereon, the active layer being prepared by the interfacial polymerization of an aqueous solution of polyhydric phenol and a solution of aromatic acyl halide dissolved in an organic solvent; or applying a porous support layer onto a nonwoven fabric and then forming an ultrathin active layer of a copolymer of aromatic polyester and aromatic polyamide superposed thereon, the active layer being prepared by the interfacial polymerization of a mixed aqueous solution of polyhydric phenol and an aromatic amine with a solution of aromatic acyl halide dissolved in an organic solvent. The composite membrane of the present invention has improvements in properties, such as water-permeability, chlorine-resistance, oxidation stability, salt rejection rate, and durability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.