Polymide gas separation membranes
US6790263B1 · kind B1 · utility
13Cited by
19References
29Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 14, 2000 |
| Grant date | Sep 14, 2004 |
| Priority date | — |
| Expiry date | Sep 14, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D71/82
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Soluble polyamic acid salt (PAAS) precursors comprised of tertiary and quaternary amines, ammonium cations, sulfonium cations, or phosphonium cations, are prepared and fabricated into membranes that are subsequently imidized and converted into rigid-rod polyimide articles, such as membranes with desirable gas separation properties. A method of enhancing solubility of PAAS polymers in alcohols is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.