Process for the delignification and bleaching of chemical paper pulps with hydrogen peroxide and at least one polymer
US6554958B1 · kind B1 · utility
2Cited by
8References
22Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 11, 1997 |
| Grant date | Apr 29, 2003 |
| Priority date | — |
| Expiry date | Apr 11, 2017 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C9/1036
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A process for the delignification and bleaching of chemical paper pulps comprising one or more stage(s) of treatment with hydrogen peroxide, at a temperature greater than 100° C. and under high pressure, in the presence of a polymer and of a compound A chosen from potassium hydroxide, sodium hydroxide and alkali metal or alkaline-earth metal carbonates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.