Method of reutilizing kraft spent liquor
US4334956A · kind A · utility
2Cited by
3References
6Claims
0Family size
Assignee
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Key dates
| Filing date | Nov 20, 1980 |
| Grant date | Jun 15, 1982 |
| Priority date | — |
| Expiry date | Nov 20, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S423/03
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method of utilizing kraft black liquor by converting the black liquor to "green liquor" and then oxidizing the green liquor with air in the presence of a quinone compound or spent liquor from the kraft process, the soda semi-chemical process or the neutral sulfite semi-chemical process as a catalyst. A marked improvement in the rate of oxidation is obtained. The thus oxidized green liquor is then able to be used as part at least of the digestion liquor in the NSSC process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.