Process of producing kraft pulping liquor by the oxidation of white liquor in the presence of lime mud
US5082526A · kind A · utility
32Cited by
4References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 5, 1990 |
| Grant date | Jan 21, 1992 |
| Priority date | — |
| Expiry date | Apr 5, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P40/40
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Sodium sulfide or hydrosulfide is oxidized to produce sodium polysulfide and sodium hydroxide. Under appropriate conditions, the oxidation may be pursued further to convert all the sodium sulfide into sodium thiosulfate. The oxidation is carried out at or above atmospheric pressure in a mixed reactor or in a pipeline reactor, by sparging oxygen or air, in a mixture of white liquor and lime mud particles produced in the recausticizing plant of a kraft mill.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.