Two-stage oxygen pulping
US4080248A · kind A · utility
0Cited by
5References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 28, 1976 |
| Grant date | Mar 21, 1978 |
| Priority date | — |
| Expiry date | Jun 28, 1996 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C3/263
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The pulping of lignocellulosic material in the presence of oxygen gas and an alkaline liquid is improved by carrying out the process in two stages. In the first stage, the alkaline liquid is trickled over the material as the oxygen is passed up through the material. In the second stage, the material is submerged in oxygenated alkaline liquid which flows through the material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.