Method and apparatus for treating pulp

Details Method and apparatus for treating pulp Method and apparatus for treating pulp

D - Textiles, Paper

21

C

D21C 9/16 (2006.01) D21C 9/14 (2006.01) D21C 9/153 (2006.01)

Patent

CA 2179700

The present invention relates to a method and apparatus for treating pulp. Especially, the invention is related to a peroxide treatment of chemical pulp, i.e., both sulphite pulp and so-called kraft pulp, and to a method and apparatusfor effecting such treatment in a novel and efficient manner. The method according to the invention is related to treating of a chemical pulp with at least hydrogen peroxide or equivalent, the kappa number of which chemical pulp has been brought to a level below 20 by either at least cooking or cooking and delignifying, so that the pulp is treated in a fast alkaline or neutral peroxidestage (Pk) for reducing the kappa number by 1 - 10, preferably 3 - 7, kappa units, the reaction time being less than 10 minutes, preferably less than 5 minutes.

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