Production and use of improved polyimide separation membranes
US6497747B1 · kind B1 · utility
17Cited by
35References
31Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 24, 1999 |
| Grant date | Dec 24, 2002 |
| Priority date | — |
| Expiry date | Sep 24, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D71/82
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for preparing polyimide gas separation membranes is disclosed. The process involves preparing polyamic acid salt membrane precursors that are converted into polyimide membranes by mild thermal or chemical treatments. The gas separation processes that utilize these polyimide membranes are further disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.