Method for bleaching of high consistency cellulosic pulp

Details Method for bleaching of high consistency cellulosic pulp Method for bleaching of high consistency cellulosic pulp

1975-03-21

1976-11-16

Bashore, S. Leon

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Treatment with particular chemical

8108R, 8108A, 162 89, D21C 912, D21C 914

Patent

active

039922502

ABSTRACT:
A method for bleaching pulp comprising the steps of dewatering or thickening the pulp to a solids concentration of about 30-40 percent, and then treating the pulp with a first treatment liquid, in a vessel, having between 3 and 10 grams of chlorine gas dissolved therein, corresponding to a charge of 20-80 kg of chlorine per ton of pulp resulting in a solids concentration of the treated pulp of 6-15 percent. Treatment with a second liquid in the vessel and other treatment steps may also be performed.

REFERENCES:
patent: 2514503 (1950-07-01), McEwen et al.
patent: 2730426 (1956-01-01), Becker
patent: 3433702 (1969-03-01), Jack et al.
patent: 3455777 (1969-07-01), Goodwald
patent: 3501374 (1970-03-01), Jack et al.
patent: 3536577 (1970-10-01), Rapson
patent: 3579419 (1971-05-01), Yorston et al.

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