Method for rapidly determining a pulp kappa number using spectrophotometry
US6475339B1 · kind B1 · utility
4Cited by
1References
13Claims
0Family size
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Key dates
| Filing date | Jun 2, 2000 |
| Grant date | Nov 5, 2002 |
| Priority date | — |
| Expiry date | Jun 2, 2020 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C3/228
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A system and method for rapidly determining the pulp kappa number through direct measurement of the potassium permanganate concentration in a pulp-permanganate solution using spectrophotometry. Specifically, the present invention uses strong acidification to carry out the pulp-permanganate oxidation reaction in the pulp-permanganate solution to prevent the precipitation of manganese dioxide (MnO2). Consequently, spectral interference from the precipitated MnO2 is eliminated and the oxidation reaction becomes dominant. The spectral intensity of the oxidation reaction is then analyzed to determine the pulp kappa number.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.