Asymmetric gas separation membranes having graded density skins
US4880441A · kind A · utility
55Cited by
23References
32Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 12, 1989 |
| Grant date | Nov 14, 1989 |
| Priority date | — |
| Expiry date | Jan 12, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02C20/40
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Asymmetric gas separation membranes having graded density skins and macrovoid-free morphology comprised of glassy, hydrophobic polymers are disclosed which are effective for separation gases with significante increases in permeation while maintaining equal or greater separation electivity. The membranes have increased free volume and the graded density skin exhibits a density gradient which becomes more dense with increasing proximity to the surface, the membrane effectively decouples the interdependency between permeability and separation selectivity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.