Method of delignification of cellulosic fiber material

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

1989-01-30

1990-01-23

Chin, Peter

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With classifying, separating or screening of pulp

162 60, 162 65, D21C 910

Patent

active

048956198

ABSTRACT:
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 lest 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 treatment with oxygen. According to the invention the separate treatment 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.

REFERENCES:
patent: 3830688 (1974-08-01), Mannbro
patent: 4220498 (1980-09-01), Prough
patent: 4230524 (1980-10-01), Hasvold
patent: 4595455 (1986-06-01), Mannbro

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