Method of brown stock washing
US4810328A · kind A · utility
13Cited by
11References
29Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 4, 1987 |
| Grant date | Mar 7, 1989 |
| Priority date | — |
| Expiry date | Nov 4, 2007 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C9/02
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An improved method of brown stock washing is disclosed. A nonionic surfactant in combination with a polyelectrolyte dispersant, and preferably a solvent, are utilized in the washing step in the pulping of virgin cellulosic fiber. The methods of the invention provide for the enhanced removal and recovery of cooking chemicals and organics from the pulp.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.