Process for the bleaching of low consistency pulp using high partial pressure ozone
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United States of America Patent
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Aug 10, 2004
Grant Date -
Jul 11, 2002
app pub date -
May 11, 2001
filing date -
May 8, 1998
priority date (Note) -
Expired
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Abstract
Provided is a process for bleaching pulp with ozone. The process involves preparing a slurry of cellulosic pulp having a consistency in fibers of from 1 up to 5 weight %. Such a low consistency slurry is then mixed with high partial pressure ozone under high shear conditions. The ozone is then maintained in contact with the cellulosic fibers to effect bleaching of the fibers. The present process offers the advantages of bleaching using a low consistency slurry, with the added advantages of employing ozone.
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