Process and composition for bleaching wood pulp

Details Process and composition for bleaching wood pulp Process and composition for bleaching wood pulp

1986-07-21

1988-06-21

Chin, Peter

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Treatment with particular chemical

162 76, 162 78, 162 80, 162 84, D21C 320

Patent

active

047523549

ABSTRACT:
A process for the oxidative or reductive bleaching of wood pulp, especially in the presence of heavy metal salts, in which a complex former combination containing at least one phosphonic acid, at least one polyhydroxycarboxylic acid and at least one phosphate or salts thereof is added to a wood pulp slurry in an amount of from 0.5 to 50%, based on the dry mass of the wood pulp, and subsequent bleaching is carried out in the presence of a reducing agent. Also provided is a complex former combination for use in the oxidative or reductive bleaching of wood pulp, comprising at least one phosphonic acid, at least one polyhydroxycarboxylic acid and at least one phosphate or salts thereof.

REFERENCES:
patent: 4599138 (1986-07-01), Lindahl
Chem. Abst., CA 103(14):106550q; Abstract of EP 141355, 5-15-85.
H. U. Suess, "Zur Bleiche von Holzstoffen auf hohe und hoechste Weissgehalte", Wochenblatt for Papierfabrikation, vol. 6, pp. 179-180, 1982.

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