Chemical treatments in bleaching stages which increase pulp brig

Details Chemical treatments in bleaching stages which increase pulp brig Chemical treatments in bleaching stages which increase pulp brig

1979-07-23

1980-12-09

Smith, William F.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Treatment with particular chemical

162 79, 162 80, 162 89, D21C 912

Patent

active

042382823

ABSTRACT:
A method for increasing the final brightness of pulp contaminated with iron or manganese in a chlorine bleaching process of the type comprising one or more alkaline stages which comprises treating the pulp with at least 0.1 lbs. per ton of a water-soluble chelating agent.

REFERENCES:
patent: 2988514 (1961-06-01), Robson et al.
patent: 3539445 (1970-11-01), Crossland
patent: 3652385 (1972-03-01), Noreus et al.

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