Separation method and device with semi-permeable membranes comprising sulphonated polyimides
US6596838B1 · kind B1 · utility
5Cited by
12References
25Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Aug 17, 2001 |
| Grant date | Jul 22, 2003 |
| Priority date | — |
| Expiry date | Aug 17, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2379/08
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention relates to a semi-permeable membrane separation process and device in which the said membranes comprise sulphonated polyimides.The present invention also relates to the use of sulphonated polyimide membranes in separation processes and devices using semi-permeable membranes. The said sulphonated polyimide comprises recurrent structures with the formula (In): and recurrent structures with the formula (Im):
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.