Post digestion treatment of cellulosic pulp to minimize formation of dioxin
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United States of America Patent
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Mar 2, 1999
Grant Date -
N/A
app pub date -
Feb 28, 1992
filing date -
Feb 28, 1992
priority date (Note) -
Expired
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Abstract
A post-digestion treatment method for cellulosic pulps which reduces the generation of dioxins and other chlorinated organics in the pulp, treatment effluent and/or the paper product produced from the pulp. In the treatment, the pulp, following digestion, is washed with a liquid that is essentially free of dioxins or dioxin precursors and simultaneously adjusted in consistency to at least a medium, and preferably a high consistency. Thereafter, the pulp is contacted with a chlorination agent selected from the group consisting of gaseous chlorine dioxide, gaseous chlorine, and gaseous chlorine dioxide which contains a minor amount of gaseous chlorine.
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