Process for enhanced oxygen delignification using high consistency and a split alkali addition
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United States of America Patent
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Dec 22, 1992
Grant Date -
N/A
app pub date -
Jan 3, 1991
filing date -
Jan 3, 1991
priority date (Note) -
Expired
status (Latency Note)
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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 20%. Additional alkali is applied onto the high consistency pulp to provide a total amount of between 0.8 and 7% by weight of oven dry pulp. The high consistency alkali containing pulp is then treated with oxygen to effect delignification. High strength, low lignin pulps are formed which may be further bleached to high brightness with reduced amounts of chemicals by following the methods of the invention.
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