Nitric oxide treatment for ozone bleaching
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United States of America Patent
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Nov 15, 1994
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N/A
app pub date -
Feb 20, 1992
filing date -
Feb 20, 1992
priority date (Note) -
Expired
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Abstract
A method of bleaching a chemical pulp by adjusting the pH of the pulp to 1.5-3.5, chelating the pulp and then treating the pulp in an N stage with nitric oxide (NO) in the amount of at least 1.5% by weight of the oven dried pulp at a consistency of between 30 and 55% and further treating the pulp in a Z stage with ozone to produce a bleach pulp having a higher viscosity for a given permanganate number compared with a similar pulp bleached without using the N stage.
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