Bleaching of cellulose pulp in a first chlorine dioxide bleaching step
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United States of America Patent
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Issued Date -
Jun 8, 2006
app pub date -
Mar 4, 2004
filing date -
Mar 7, 2003
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Abandoned
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Abstract
The method is for bleaching cellulose pulp having an MC consistency in a first step with chlorine dioxide in a bleaching sequence with several bleaching steps. The pulp is bleached in this first chlorine dioxide step in a first phase at a lower temperature of 60.+-.10.degree. C. during a retention time of from 30 seconds to 30 minutes, after which the pulp is heated by at least 10.degree. C. to a reaction temperature of 90.+-.10.degree. C. for a second phase, which has a retention time of 60-200 minutes, With this process modification of a first chlorine dioxide step, an efficient destruction of undesired organic acids is obtained, while at the same time improved viscosity/strength of the pulp can be obtained of the finally bleached pulp with a whiteness of approximately 90% ISO.
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