Separating aromatics from non-aromatics by polyimide-polyester membrane
US5670052A · kind A · utility
22Cited by
8References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 30, 1996 |
| Grant date | Sep 23, 1997 |
| Priority date | — |
| Expiry date | Jul 30, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L79/08
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A copolymer composition comprising the hard segment of a polyimide, the soft segment of an oligomeric aliphatic polyester, and a diepoxide for crosslinking and esterification. The diepoxide polyimide copolymer membranes have exhibited high selectivity and flux for separation of an aromatic/saturate mixture. These membranes have shown much better stability in soaking with an aromatic/saturate feed than the copolymer membranes without a diepoxide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.