Process for delignification and bleaching of chemical wood pulps

Details Process for delignification and bleaching of chemical wood pulps Process for delignification and bleaching of chemical wood pulps

1997-02-25

1998-06-16

Alvo, Steven

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Gas, vapor or mist contact

162 72, 162 78, D21C 916

Patent

active

057664153

ABSTRACT:
A process of delignifying and bleaching a chemical wood pulp with hydrogen peroxide and dicyandiamide as an activator provides a higher degree of delignification and brightness of the pulp and overcomes problems of fibre degradation. The process comprises adding hydrogen peroxide and dicyandiamide as a bleaching activator to a chemical wood pulp slurry under alkaline conditions.

REFERENCES:
patent: 3756774 (1973-09-01), Kirner
patent: 4740212 (1988-04-01), Yant et al.
patent: 5034096 (1991-07-01), Hammer et al.
patent: 5620563 (1997-04-01), Chen

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