Method for bleaching paper pulp
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United States of America Patent
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Sep 26, 2000
Grant Date -
N/A
app pub date -
Apr 15, 1999
filing date -
Sep 11, 1996
priority date (Note) -
Expired
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Abstract
A process for the delignification and bleaching of chemical pulp utilizes an acid treatment stage aimed at reducing the quantity of hexene uronic acids present in the pulp by at least 30%, and a pH adjustment stage of the pulp aimed at depositing or redepositing ions of alkaline-earth metals on the fibres of the pulp. The process further includes a washing stage of the pulp and a treatment stage of the pulp with an oxidizing agent. A chelating agent is added to the pulp before and/or during the acid treatment stage and/or before or during the pH adjustment stage or between the pH adjustment stage and washing stage.
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