Method of reducing the lignin in wood pulp with oxygen gas recirculation
US4581104A · kind A · utility
7Cited by
3References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 31, 1985 |
| Grant date | Apr 8, 1986 |
| Priority date | — |
| Expiry date | Jan 31, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2219/00164
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An exothermic reaction of a gas with a gas permeable material is performed in a retention vessel. Temperature control of the exothermic reaction is obtained by recirculating the gas from the top of the vessel downwardly through and co-current to the gas permeable material and removing the downwardly flowing gas at a point above the bottom of the reactor and simultaneously recirculating gas which has been cooled into the bottom of the reactor, upwardly through and counter-current to the gas permeable material and removing the gas at a point above the bottom of the reactor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.