Process for ozone bleaching of low consistency pulp

  • US 6,579,412 B2
  • Filed: 07/24/2002
  • Issued: 06/17/2003
  • Est. Priority Date: 05/08/1998
  • Status: Expired due to Term
First Claim
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1. A process for bleaching pulp with ozone, which comprises:

  • preparing a slurry of cellulosic pulp having a consistency in fibers of from 1 to less than 5 weight %;

    adding ozone to the cellulosic pulp under high shear mixing conditions; and

    maintaining the ozone in contact with the cellulosic fibers under the high shear mixing conditions for a period of time ranging from 0.01-4 seconds thereby consuming 87-99% of the ozone.

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