Wood pulp bleaching process

Details Wood pulp bleaching process Wood pulp bleaching process

1986-12-19

1988-06-07

Terapane, John F.

Bleaching and dyeing; fluid treatment and chemical modification

Bleaching

Chemical

162 78, 25218641, D06L 302

Patent

active

H00004790

ABSTRACT:
An improvement upon processes for the bleaching of wood pulp which comprise preparing an aqueous alkaline bleaching medium containing hydrogen peroxide and contacting the pulp with said medium under agitation. The improvement particularly comprises agitating a suspension of the pulp in an aqueous medium containing the hydrogen peroxide and between about 15 and 65 percent by mol of one or more of a limited class of alkenylsuccinic anhydride compounds which are found to promote the bleaching of the wood pulp by the hydrogen peroxide. The improved process of the invention is further found to be necessarily restricted to operation under limited conditions of bleaching mixture temperature and pH.
The invention is usefully applied in the preparation of a wide variety of paper and paperboard products. The invention has particular benefit in accomplishing a high degree of bleaching performance at relatively low bleaching system temperatures.

REFERENCES:
patent: 3462344 (1969-08-01), Kindron

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