Process for the preparation of delignified and bleached chemical paper pulps
US6019870A · kind A · utility
9Cited by
2References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 17, 1997 |
| Grant date | Feb 1, 2000 |
| Priority date | — |
| Expiry date | Jan 17, 2017 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C9/163
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A process of dignifying lignocellulosic pulp with oxygen followed by treatment of the delignified pulp with a chelating agent, followed by washing, followed by treatment with hydrogen peroxide at an alkaline pH in the presence of an alkali metal silicate at a temperature greater than 100.degree. C. and a pressure greater than 1.5 times the saturated vapor pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.