Process for delignification of chemical wood pulp using sodium sulphite or bisulphite prior to oxygen-alkali treatment
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United States of America Patent
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Dec 24, 1985
Grant Date -
N/A
app pub date -
Jun 22, 1984
filing date -
Jun 29, 1983
priority date (Note) -
Expired
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Abstract
In the delignification of chemical wood pulp with oxygen and alkali a larger reduction of the kappa number may be obtained without an increase in the charge of oxygen or alkali, provided the pulp is pretreated with a solution of sulphite or bisulphite in order to introduce hydrophilic groups in the sulphate lignin in the chemical wood pulp.
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