Permeation modified gas separation membranes
US4575385A · kind A · utility
39Cited by
16References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 30, 1983 |
| Grant date | Mar 11, 1986 |
| 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 polymeric 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 improved permeation selectivities for the at least one gas when the asymmetric membranes have been contacted on one or both surfaces with an effective amount of a permeation modifier. The permeation modified asymmetric gas separation membrane having an effective amount of permeation modifier added in a non-homogeneous mode and without loss of Tg.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.