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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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Patent Number

US5366593A

Assignee

The Curators of the University of Missouri, Columbia, MO

Assignee

Pulp and Paper Research Institute of Canada

Application Number

927164

Date Filed

8-11-1992

Issue Date

11-22-1994

Comments

5366593

Bleaching of lignocellulosic material with in-situ-generated dioxirane

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