Process for peroxide bleaching of pulp using MgO particles
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United States of America Patent
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May 2, 2000
Grant Date -
N/A
app pub date -
Feb 19, 1998
filing date -
Jun 13, 1996
priority date (Note) -
Expired
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Abstract
A process for peroxide bleaching of pulp using magnesium oxide as sole alkaline source wherein said pulp is bleached in the presence of hydrogen peroxide for a maximum period of 180 minutes and achievement of a maximum target ISO brightness of 65 in regard to freshly prepared pulp characterized in that said magnesium oxide is utilized as MgO particles having a particle size of 5-500 microns and a particle surface area (PSA) of between 20-60 m.sup.2 /g. By using such parameters, a peroxide bleaching process may be carried out most efficiently on a commercial scale.
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