Production of activated carbon fibers from acid contacted polybenzimidazole fibrous material
US4460708A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 6, 1983 |
| Grant date | Jul 17, 1984 |
| Priority date | — |
| Expiry date | May 6, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B32/382
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An improved process which makes possible the expeditious formation of activated carbon fibers having high absorptivity characteristics is provided. A polybenzimidazole fibrous material is contacted with a solution of an acid (e.g. sulfuric acid) so as to form a polybenzimidazonium salt (as described), and the resulting fibrous material is preoxidized, carbonized, and activated under the conditions defined which have been found to reliably and expeditiously yield the desired product. The resulting activated carbon fiber product exhibits a dynamic weight absorptivity of at least 100 mg. of CCl.sub.4 per gram, and particularly is suited for the formation of protective garments having highly satisfactory sorptive characteristics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.