Sequential bleaching of de-inked paper pulp with sodium bisulfit

Details Sequential bleaching of de-inked paper pulp with sodium bisulfit Sequential bleaching of de-inked paper pulp with sodium bisulfit

1994-11-18

1996-10-08

Alvo, Steven

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Waste paper or textile waste

162 7, 162 8, 162 76, 162 80, 162 83, 162 84, D21C 502, D21C 910

Patent

active

055628036

ABSTRACT:
Paper pulp, especially recycled paper pulp which has been deinked, is bleached in a synergistic two-stage process first with sodium bisulfite and then with sodium borohydride. The borohydride is preferably added in an aqueous mixture with sodium hydroxide. A weak acid such as acetic acid may be added to the pulp to advance further the brightness gain.

REFERENCES:
patent: 3284283 (1966-11-01), Kindron et al.
patent: 4198266 (1980-04-01), Kirk et al.
patent: 4804440 (1989-02-01), Liebergott et al.
patent: 5429716 (1995-07-01), Hache et al.
patent: 5449436 (1995-09-01), Bourson et al.
Munroe et al, "The SRP Process For High Brightness Mechanical Pulp"; pp. 1-6.
Singh, The Bleaching of Pulp, TAPPI Press; Atlanta, Ga. p. 149, 1979.
Database WPI, Section Ch, Week 7739, Derwent Publications Ltd., London, GB; Class E17, AN 77-70158Y & SU-A-536 271 (Perm Pulp Paper Ind) 4 Mar. 1977.

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