Method and apparatus for delignifying chemical pulp

Details Method and apparatus for delignifying chemical pulp Method and apparatus for delignifying chemical pulp

D - Textiles, Paper

21

C

D21C 9/147 (2006.01) D21C 9/10 (2006.01)

Patent

CA 2190573

The present invention relates to a method of delignifying chemical pulp. In particular, the invention relates to delignification of pulp with oxygen under alkaline conditions in such a way that white liquor is preferably used as the source of alkali. Especially preferably, the method according to the invention is applicable to delignification of so called Kraft pulp. It is characteristic of the method according to the invention that the pulp is led in the same delignification stage through more than one delignification steps, and that oxygen and alkali are added into the pulp between at least two steps, said alkali being unoxidized white or green liquor.

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