Process for the continuous digestion of cellulosic fiber material
US5080755A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 12, 1989 |
| Grant date | Jan 14, 1992 |
| Priority date | — |
| Expiry date | Oct 12, 2009 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C11/0021
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A process for the continuous digestion of cellulosic fiber material is described wherein the material is impregnated with liquid in a closed system comprising a concurrent flow zone and a countercurrent flow zone, the liquid in the concurrent flow zone including black liquor and possibly white liquor and the liquid in the countercurrent flow zone including white liquor. Liquid is withdrawn from the impregnation system at a point located between the concurrent flow zone and the countercurrent flow zone. Besides white liquor a predetermined amount of black liquor is added to the countercurrent flow zone in order to obtain a high liquid to wood ratio in the inlet of the digester.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.