Bleaching of lignocellulosic material with in-situ-generated dioxirane
US5366593A · kind A · utility
9Cited by
2References
35Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Aug 11, 1992 |
| Grant date | Nov 22, 1994 |
| Priority date | — |
| Expiry date | Aug 11, 2012 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C9/166
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.