Method of bleaching high consistency pulp with ozone
US5174861A · kind A · utility
13Cited by
49References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 28, 1991 |
| Grant date | Dec 29, 1992 |
| Priority date | — |
| Expiry date | Aug 28, 2011 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C9/10
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method for delignifying and bleaching a lignocellulosic pulp with a gaseous bleaching agent in a reactor 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.