Countercurrently bleaching high consistency cellulose pulp with

Details Countercurrently bleaching high consistency cellulose pulp with Countercurrently bleaching high consistency cellulose pulp with

1975-04-09

1977-05-10

Corbin, Arthur L.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Continuous chemical treatment or continuous charging or...

8111, 162;65, D21C 910

Patent

active

040226549

ABSTRACT:
Finely disintegrated and fluffed cellulose pulp, at a consistency of 25-35%, is introduced into the top of a reaction tower and countercurrently bleached with oxygen gas, introduced into the lower portion of the tower, at a temperature of 80.degree.-120.degree. C. The pulp is maintained in the tower as a gas permeable column having a maximum height, in meters, equal to five tenths of the pulp consistency.

REFERENCES:
patent: 3024158 (1962-03-01), Grangaard et al.
patent: 3668063 (1972-06-01), Engstrom
patent: 3703435 (1972-11-01), Schleinkofer

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