Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Gas – vapor or mist contact
Patent
1995-04-28
1997-08-12
Corbin, Arthur L.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Gas, vapor or mist contact
162 78, D21C 9147, D21C 9153, D21C 916
Patent
active
056561300
ABSTRACT:
The present invention relates to a Kraft pulp bleaching stage which is to be carried out after conventional bleaching stages to high brightness. It has been discovered that ambient-temperature bleaching with inorganic peroxy acid salts, such as peroxymonosulfates, at this point can provide substantial increases in pulp brightness without significant decreases in pulp viscosity. Peroxy acid bleaching according to the present invention is carried out at ambient temperature and no greater than about 40.degree. C. and at an initial pH that is slightly alkaline and preferably about 7.25.
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Corbin Arthur L.
Union Camp Holding, Inc.
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