Process for acid sulfite digestion of wood
US4295929A · kind A · utility
8Cited by
2References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 19, 1980 |
| Grant date | Oct 20, 1981 |
| Priority date | — |
| Expiry date | Mar 19, 2000 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C3/06
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The production of chemical pulp by the acid sulfite digestion process is improved by increasing the ratio by weight of combined SO.sub.2 to wood to a range of from 4 to 12 (based on one part of combined SO.sub.2 to 100 parts of dry wood) and by increasing the minimum average rate of heating to the substantially maximum cooking temperature to 40.degree. C. per hour.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.