Oxidase process for pulp
US6660128B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Oct 10, 2000 |
| Grant date | Dec 9, 2003 |
| Priority date | — |
| Expiry date | Dec 30, 2020 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C5/005
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method for selectively delignifying lignocellulosic materials and bleaching of pulp and dyes using a combination of an oxidative enzyme and a metal complex. More specifically, the process involves the oxidation of a transition metal redox complex by a phenol oxidizing enzyme such as laccase or peroxidase to mediate the catalytic delignification of chemical pulp and bleaching of textile dye. This process is unique in that only a catalytic amount of metal complex mediator is required on softwood or hardwood kraft pulp, and that recycling or regeneration of the mediator for further pulp delignification is possible. The redox mediator is characterized in that it contains a transition metal ion coordinated with molecules or ions in such a way that the complexes have a formal redox potential between 0.5 and 1.2 volt measured against a normal hydrogen electrode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.