Kraft pulp yield by heat treatment of polysulphide liquors generated by oxidation
US7371307B2 · kind B2 · utility
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2References
13Claims
0Family size
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Key dates
| Filing date | Nov 19, 2004 |
| Grant date | May 13, 2008 |
| Priority date | — |
| Expiry date | Nov 2, 2025 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C11/0057
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Oxidized white liquor is heat treated to increase the concentration of polysulphide measured at 285 or 286 nm (PSUV) or measured at 416 nm (PSVIS) and the PSUV/PSGR or PSVIS/PSGR ratio, whereby the content of active polysulphide in the total polysulphide is increased which active polysulphide can be exploited to increase pulp yield in Kraft pulping.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.