Treatment of cellulosic material with a chelating agent prior to alkaline delignification
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United States of America Patent
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Jul 2, 2002
Grant Date -
N/A
app pub date -
Aug 3, 2001
filing date -
Nov 6, 1998
priority date (Note) -
In Force
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Abstract
A process for the production of pulp using alkaline delignification is disclosed, wherein cellulosic material is initially treated with steam, and a chelating agent is added in connection with the steam treatment. The end pH of the steam treatment stage is below 5. Liquors containing chelated, so-called non-process compounds are not recycled in the pulping process, but expelled therefrom for further processing where non-process compounds are eliminated.
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