Asymmetric gas separation membranes
US4472175A · kind A · utility
37Cited by
12References
28Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 30, 1983 |
| Grant date | Sep 18, 1984 |
| Priority date | — |
| Expiry date | Jun 30, 2003 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D67/0088
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Asymmetric gas separation membranes of materials having selective permeation of at least one gas of a gaseous mixture over that of one or more remaining gases of the gaseous mixture, exhibit significantly improved permeation selectivities for the at least one gas when the asymmetric membrane is contacted on one or both surfaces with an effective amount of a Br nsted-Lowry acid. The improved asymmetric gas separation membranes, process for producing the improved membrane, and processes utilizing such membranes for selectively separating at least one gas from a gaseous mixture by permeation are disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.