Process for delignification of cellulosic substances by pretreating with a complexing agent followed by peroxide prior to kraft digestion
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United States of America Patent
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May 2, 1989
Issued Date -
N/A
app pub date -
Mar 2, 1987
filing date -
Aug 5, 1985
priority date (Note) -
Expired
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Abstract
Process for the delignification of cellulosic substances comprising: a first stage of treatment of cellulosic substances with an acid a second stage of treatment with hydrogen peroxide in an alkaline medium a third stage of digestion in the presence of at least one chemical reactant chosen from sulphur-containing compounds and oxygen. The process applies to the treatment of wood fragments.
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