Process for increasing the selectivity of asymmetric membranes
US5007944A · kind A · utility
6Cited by
13References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 11, 1987 |
| Grant date | Apr 16, 1991 |
| Priority date | — |
| Expiry date | May 11, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D71/643
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for producing an improved membrane for separating gases in mixtures including forming an integral, asymmetric polyether imide membrane, treating the membrane with at least one organic fluid which is a solvent or swelling agent for polyether imide, and removing the organic fluid from the membrane by evaporation to obtain a tubular, flat or hollow fiber membrane exhibiting significantly higher selectivity than an untreated membrane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.