KRAFT COOKING METHOD USING POLYSULFIDE COOKING LIQUOR
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United States of America Patent
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Issued Date -
Oct 9, 2014
app pub date -
Aug 30, 2011
filing date -
Aug 30, 2011
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Abandoned
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Abstract
The method is for the preparation of kraft pulp with increased pulping yield from lignin-containing cellulosic material using polysulfide cooking liquor. In order to increase carbohydrate stabilization and hence the yield from a kraft cooking process a first impregnation stage is using polysulfide cooking liquor implemented at high alkali and polysulfide concentration and at a low temperature.
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