Process for bleaching kraft pulp

Details Process for bleaching kraft pulp Process for bleaching kraft pulp

1995-07-20

1997-11-04

Jordan, Charles T.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Treatment with particular chemical

D21C 320

Patent

active

H00016900

ABSTRACT:
A method for bleaching lignocellulose containing pulp which has been chemically pulped is described wherein the method comprises the steps of sequentially treating the pulp with a reducing agent, a chelating agent and an oxidative agent.

REFERENCES:
patent: 4578149 (1986-03-01), Fagerlund
patent: 4804440 (1989-02-01), Liebergott et al.
patent: 5211809 (1993-05-01), Naddeo et al.
McDonough, T. J., "The Chemistry of Organosolv Delignification", Tappi Journal, vol. 76, No. 8: 186(1993).
Liebergott, N. et al., "Bleaching a Softwood Kraft Pulp without Chlorine Compounds", Tappi Journal, vol. 67, No. 8: 76 (1984).
Liebergott, N. et al., "Bleaching a Softwood Kraft Pulp without Chlorine Compounds", 1983 Pulping Conference Proceedings, Tappi Press, Atlanta, pp. 323-332.
Leduc, C., Gagne, C., Barbe, M., Daneault, C., "Bleaching of Chemimechanical Pulps: A Comparison of Oxidizing and Reducing Multistage Sequences", 1989 Pulping Conference Proceedings, Tappi Press, Atlanta, pp. 627-640.
Ducharme, N. et al., "Optimum Conditions for the Bleaching of Totally Chlorine Free Kraft Pulps with a Sodium Hydrosulfite Bleach Solution", 1993 Pulping Conference Proceedings, Tappi Press, Atlanta, p. 777.

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