Totally chlorine free bleaching process using recovered filtrate
US6336994B1 · kind B1 · utility
1Cited by
18References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 2, 1995 |
| Grant date | Jan 8, 2002 |
| Priority date | — |
| Expiry date | May 2, 2015 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C11/0028
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a process for producing pulp which is cooked under alkaline conditions and which is bleached without using chlorine-containing bleaching chemicals, in which process used cooking chemicals are recovered in a first recovery installation and used bleaching chemicals are recovered in a second recovery installation. The used cooking and bleaching chemicals can be regenerated and reused.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.