Method of delignification of cellulosic fiber material

Details Method of delignification of cellulosic fiber material Method of delignification of cellulosic fiber material

D - Textiles, Paper

21

C

9/16.5

D21C 9/10 (2006.01) D21C 3/02 (2006.01)

Patent

CA 1322828

A METHOD OF DELIGNIFICATION OF CELLULOSIC FIBER MATERIAL Abstract of the Disclosure A method of delignification of cellulosic fiber material is described. The pulp containing said cellulosic fiber material is fed in a main line containing a main reactor in which the pulp is treated with oxygen. The pulp is screened at at least one point in the main line, and the screen reject obtained is fed in a branch line containing at least one secondary reactor for separate treat- ment with oxygen. According to the invention the separate treat- ment with oxygen is carried out without previous refining, and the screen reject thus separately treated in said branch line is returned to the main line at a point upstream of said main reactor.

593974

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