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US 10,513,824 B2Granted
Method for reducing pulp viscosity in production of dissolving pulp
AssigneeKemira Oyj
InventorsLeif Robertson, Veli-Matti Vuorenpalo, Jonas Konn, Kaisa Kaski
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Abstract
The invention relates to a method for reducing pulp viscosity in production of dissolving pulp. The method comprises producing cellulose pulp, whereby the obtained cellulose pulp has a cellulose content of at least 90%, and bleaching the obtained cellulose pulp. The cellulose pulp is treated after bleaching with performic acid.
Claims13
A method for reducing pulp viscosity in production of dissolving pulp, the method comprising:
- producing a cellulose pulp having a cellulose content of at least 90%;
- bleaching the obtained cellulose pulp;
- and
- decreasing
- the viscosity of the bleached pulp by treating the bleached pulp with performic acid, while at the same time, keeping a brightness change of the pulp to less than 1% ISO,
- wherein the brightness change is a difference between a brightness of the pulp measured before a treatment with the performic acid and a brightness of the pulp measured after a treatment with the performic acid, and
- wherein the pH during treatment with the performic acid is in a range between 6-8.
4 more elements
Dependencies are inferred from the claim text.