Method of producing oxidized white liquor using dregs containing carbon particles
US5972165A · kind A · utility
8Cited by
6References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 17, 1997 |
| Grant date | Oct 26, 1999 |
| Priority date | — |
| Expiry date | Jan 17, 2017 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C11/0057
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
White liquor produced from black liquor is partially or completed oxidized. The white liquor contains dregs that are utilized as a carbon based catalyst. Dregs are produced by separating the dregs from green liquor an intermediate product between the black liquor and the oxidized white liquor. After formation of the oxidized white liquor, the dregs are separated therefrom to form a waste dreg stream which can be recycled so that part of the dregs present within the dregs containing white liquor stream to be oxidized is contributed by the waste dreg stream.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.