Pulp cooking with particular alkali profiles
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United States of America Patent
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app pub date -
Nov 23, 2004
filing date -
Oct 26, 1998
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Abandoned
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Abstract
Yield, particularly when treating hardwood chips, can be improved by at least 1-2% in a kraft cellulose pulping process by keeping the temperature and effective alkali (EA) low during impregnation, and by keeping the EA low in at least a first cook stage. After cooking, the pulp is subjected to cooling low EA liquor, e.g. to reduce its temperature to below 120.degree. C. (preferably below 100.degree. C.) with an EA below about 5 g/L (expressed as NaOH). Continuous treatment in a continuous digester system is preferred, with the EA below about 20 g/L during impregnation and the first cook.
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