Bleaching of lignocellulosic material with in-situ-generated dioxirane
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United States of America Patent
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Nov 22, 1994
Issued Date -
N/A
app pub date -
Aug 11, 1992
filing date -
Feb 12, 1991
priority date (Note) -
Expired
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Abstract
A chemical pulp which contains reactants capable of generating dioxirane within the pulp is produced in a process which comprises mixing a pulp with reactants comprising a carbonyl compound, preferably acetone, and an oxygen donor, preferably monoperoxysulfate, in proportions which produce a water-soluble dioxirane having a molecular diameter of less than 140 angstrom units. Such a pulp bleaching process which employs dioxirane as a bleaching agent is rendered environmentally and economically acceptable by recycling the reactants employed to produce the dioxirane.
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