Method and arrangement for oxygen delignification of cellulose pulp
US7156952B2 · kind B2 · utility
9Cited by
6References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 13, 2004 |
| Grant date | Jan 2, 2007 |
| Priority date | — |
| Expiry date | Nov 25, 2024 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C9/147
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The invention relates to a method and arrangement for alkaline oxygen delignification of cellulose pulp. By adding alkali in the final phase of the oxygen delignification one can ensure that an optimal predetermined end-pH is obtained. This provides advantages in the subsequent bleaching since the bleachability is substantially improved in the form of reduced need for bleaching chemicals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.