Method of bleaching a pulp
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United States of America Patent
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Sep 4, 2012
Grant Date -
Feb 17, 2011
app pub date -
Feb 12, 2009
filing date -
Feb 28, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Methods for bleaching oxygen delignified and washed pumps having a consistency of between 8 and 20% are disclosed including a first chlorine dioxide bleaching step, washing the bleached pulp, subjecting the washed pulp to an alkaline extraction step to obtain an alkali-containing pulp, adding chlorine dioxide and adjusting the pH in a second chlorine dioxide bleaching step performed directly after the alkaline extraction step without an intermediate washing step, and subjecting the bleached alkali-containing pulp to a peroxide treatment step directly after the second chlorine dioxide bleaching step or with an intermediate washing step prior to the peroxide treatment step.
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