Method for removing sulfur from fiber using halide salt ion exchange
US9284665B2 · kind B2 · utility
0Cited by
6References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 11, 2012 |
| Grant date | Mar 15, 2016 |
| Priority date | — |
| Expiry date | Feb 6, 2032 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD10B2331/021
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The present invention concerns methods for removing sulfur from a fiber made from a polymer comprising imidazole groups, said method comprising: a) contacting never-dried sulfate anion containing polymeric-fiber with an aqueous salt solution comprising halide anions to displace at least a portion of the sulfate anions with halide anions; and b) rinsing the fiber to remove displaced sulfate anions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.