Method of bleaching high consistency pulp with ozone
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United States of America Patent
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Dec 29, 1992
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N/A
app pub date -
Aug 28, 1991
filing date -
Oct 26, 1990
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Abstract
A method for delignifying and bleaching a lignocellulosic pulp with a gaseous bleaching agent in a reactor without the use of elemental chlorine. The bleaching reactor is a horizontal vessel having a central rotatable shaft which preferably contains paddles, cut and folded screw flights or a ribbon flight, to disperse and advance the pulp particles in a plug flow manner while contacting and mixing the pulp particles with a gaseous bleaching agent such as ozone for substantially uniform bleaching thereof.
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