Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With cleaning – preserving or conditioning of apparatus
Patent
1995-10-25
1998-03-17
Alvo, Steven
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With cleaning, preserving or conditioning of apparatus
162 65, 162 78, 162 89, 162 90, D21C 902
Patent
active
057282641
ABSTRACT:
The use of hot water extraction (pH 7-8, 165.degree. F.) in place of an alkaline extraction in pulp bleaching sequences between an ozone delignification stage alkaline wash and a brightening stage allows higher strength pulp to be achieved at essentially the same brightness levels using reduced overall amounts of bleaching chemicals. In addition, effluents from pulp washing stages following these treatments can be recycled without generating scale in process equipment because the solubility of salts that could form such scale is significantly greater in these effluents.
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Alvo Steven
Union Camp Patent Holding, Inc.
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