Method for ozone bleaching of high consistency pulp in two stages
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United States of America Patent
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-
Nov 23, 1999
Issued Date -
N/A
app pub date -
Mar 8, 1994
filing date -
May 24, 1991
priority date (Note) -
Expired
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Abstract
A two stage ozone-pulp bleaching method and apparatus are disclosed. In the first stage, high consistency pulp particles are turbulently mixed and contacted with a gaseous mixture containing ozone to mix and contact substantially all of the pulp particles with ozone to react at least a portion of the pulp particles with the ozone. Pulp particles and gaseous bleaching mixture are then directed to a second stage including a quiescent pulp bed. Pulp particles may complete their reaction in the bed, which also serves to strip ozone which was not contacted with pulp particles in the first stage from the gaseous bleaching mixture.
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