Method of bleaching pulp without using chlorine chemicals in a (QP)Z bleaching sequence
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United States of America Patent
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Dec 4, 2001
Grant Date -
N/A
app pub date -
Nov 20, 1995
filing date -
Jun 8, 1993
priority date (Note) -
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Abstract
Provided is a method of treating chemical paper pulp having the steps of: adjusting the pH of the pulp to be between 1 and 6; treating the pulp with ozone to reduce the kappa number of the pulp; treating the pulp with a chelating agent after the ozone treating step without any intervening washing step between the ozone treating step and the chelating agent treating step; adjusting the pH of the pulp by adding alkali together with or after the addition of chelating agent to a pH exceeding 3; washing the pulp; and bleaching the pulp with peroxide.
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