Process for the bleaching of a pulp suspension by separating calcium from lignin
US6679972B1 · kind B1 · utility
2Cited by
4References
24Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 15, 2002 |
| Grant date | Jan 20, 2004 |
| Priority date | — |
| Expiry date | Feb 15, 2022 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H23/04
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A process for the bleaching of lignin present in pulp fibers in an aqueous environment such as a pulp suspension. The invention also relates to a process for producing paper or board from pulp containing bleached lignin. According to the invention carbon dioxide is used for the bleaching of lignin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.