Process for oxygen delignifying high consistency pulp by removing and recycling pressate from alkaline pulp
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United States of America Patent
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Jun 8, 1993
Issued Date -
N/A
app pub date -
Apr 16, 1991
filing date -
Feb 15, 1989
priority date (Note) -
Expired
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Abstract
Unbleached pulp is combined with an aqueous alkaline solution while in a state of low consistency to distribute a first amount of alkaline material substantially uniformly throughout the pulp. The consistency of the pulp is then increased to above about 18%, and the high consistency alkali containing pulp is then treated with oxygen to effect delignification. The total amount of alkaline material applied to the pulp is between 0.8 and 7% by weight of oven dry pulp. High strength, low lignin pulps are subsequently formed which may be further bleached to high brightness with reduced amounts of chemicals.
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