Process for bleaching cellulose pulp, a plant for preforming sai

Details Process for bleaching cellulose pulp, a plant for preforming sai Process for bleaching cellulose pulp, a plant for preforming sai

1987-01-28

1989-06-13

Chin, Peter

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Continuous chemical treatment or continuous charging or...

162 24, 162 45, 162 56, 162 57, 162 59, 162234, 162243, 162246, 162248, 162251, 210209, 210211, 210523, 2412001, D21C 900

Patent

active

048389951

ABSTRACT:
For bleaching cellulose pulp or a fraction thereof, e.g. reject pulp, the cellulose pulp or fraction, having a concentration of 0.5-10%, preferably 3-6%, is introduced into a screw press comprising at least a first (47) and a second (48) dewatering zone, is dewatered in the first zone to a concentration of 20-40%, whereupon a liquor of bleach chemicals is introduced centrally into the pulp which, during continued treatment, is dewatered in the second zone to a discharge pulp concentration of 15-50, preferably 15-30%, the liquid pressed out of the second zone, together with fresh bleach chemicals, being returned to the pulp in the screw press as liquor of bleach chemicals.

REFERENCES:
patent: 2355091 (1944-08-01), McDonald

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