Title:
BIOBLEACHING PROCESS
Document Type and Number:
WIPO Patent Application WO/1992/021813
Kind Code:
A1
Abstract:
A process for the production of a bleached lignocellulosic material is provided which comprises the biological treatment of a chemical pulp with xylanase, followed by a chlorination stage conducted with chlorine and chlorine dioxide. The chlorination stage is characterized by the timing of addition of the chlorine prior to the addition of the chlorine dioxide. A process to produce bleached pulp at a lower chemical consumption and cost results.
Inventors:
HAMILTON JANICE (CA)
DU MANOIR JOHN R (CA)
SENIOR DAVID J (CA)
DU MANOIR JOHN R (CA)
SENIOR DAVID J (CA)
Application Number:
PCT/CA1992/000236
Publication Date:
December 10, 1992
Filing Date:
June 05, 1992
Export Citation:
Assignee:
ICI CANADA (CA)
International Classes:
D21C5/00; D21C9/14; (IPC1-7): D21C5/00; D21C9/14
Foreign References:
| EP0386888A2 | 1990-09-12 | |||
| FR2416297A1 | 1979-08-31 | |||
| EP0383999A2 | 1990-08-29 |
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