Method of producing chemical pulp
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United States of America Patent
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Oct 18, 2022
Grant Date -
Jun 11, 2020
app pub date -
May 15, 2018
filing date -
May 16, 2017
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Abstract
A method of producing chemical pulp including at least the following steps: a) wood chips or other comminuted ligno-cellulosic fibrous material is treated with a polysulfide-containing cooking liquor in an impregnation stage at a temperature of 90-145° C., and b) slurry of fibrous material from step a) is heated into cooking temperature and cooked for producing pulp having a desired kappa number. After step a) mercaptide ions are added into the slurry of fibrous material and the fibrous material is treated at cooking temperature in step b).
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