Eop & Ep process for bleaching of chemical pulp
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United States of America Patent
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Issued Date -
Feb 6, 2003
app pub date -
Feb 27, 2002
filing date -
Feb 27, 2001
priority date (Note) -
Abandoned
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Abstract
The subject process comprises providing chemical pulp and an E.sub.op and/or E.sub.p aqueous bleaching solution. The E.sub.op aqueous bleaching solution comprises a peroxide compound, an oxygen-containing material, sodium hydroxide and magnesium hydroxide, in the absence of magnesium sulfate. Alternatively, the E.sub.op aqueous chemical solution for bleaching chemical pulp comprises an E.sub.op aqueous bleaching solution consisting essentially of a peroxide compound, an oxygen-containing material, sodium hydroxide and magnesium hydroxide. In any case, the chemical pulp is bleached with the E.sub.op aqueous bleaching solution to form a bleached chemical pulp. The E.sub.p aqueous bleaching solution comprises a peroxide compound, sodium hydroxide and magnesium hydroxide, in the absence of magnesium sulfate. Alternatively, the E.sub.p aqueous bleaching solution consists essentially of a peroxide compound, sodium hydroxide and magnesium hydroxide. In any case, the chemical pulp is bleached with the E.sub.op and/or E.sub.p aqueous bleaching solution to form a bleached chemical pulp as part of an overall chemical pulp bleaching sequence.
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