Reactor for bleaching high consistency pulp with ozone
US5181989A · kind A · utility
14Cited by
50References
29Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 26, 1990 |
| Grant date | Jan 26, 1993 |
| Priority date | — |
| Expiry date | Oct 26, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01F27/1145
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An apparatus for delignifying and bleaching a lignocellulosic pulp without the use of elemental chlorine. The bleaching reactor is a horizontal vessel having a central rotatable shaft which preferably contains paddles, cut and folded screw flights or a ribbon flight, to disperse and advance the pulp particles in a plug flow manner while contacting and mixing the pulp particles with a gaseous bleaching agent such as ozone for substantially uniform bleaching thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.