Process for the electrochemical reductive bleaching of lignocellulosic pulp
US4596630A · kind A · utility
1Cited by
9References
11Claims
0Family size
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Key dates
| Filing date | Dec 21, 1984 |
| Grant date | Jun 24, 1986 |
| Priority date | — |
| Expiry date | Dec 21, 2004 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C9/1021
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Reductive bleaching of lignin containing pulps employing polydentate ligand complexes of dipositive vanadium, chromium and titanium. High brightness pulps with good reversion stability are obtained. The process is essentially polution free as the reduced complexes can be repeatedly regenerated electrochemically.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.