D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
8/78
D21C 9/10 (2006.01) D21C 9/16 (2006.01)
Patent
CA 1084207
PROCESS FOR THE BLEACHING OF CELLULOSE PULP ABSTRACT OF THE DISCLOSURE A process is provided for the bleaching of cellulose pulp, particularly for the peroxide bleaching of high yield pulp, which comprises forming a suspension of lignocellulosic pulp material; mixing the suspension in a mixing zone with a bleaching agent while adjusting the temperature of the pulp suspension to within the range from about + 10°C to about -10°C of a temperature within the range from about 40° to about 95°C at which bleaching is to be carried out; quickly dewatering the pulp suspension to a pulp consistency within the range from about 18 to about 50% equal to or at most 5% less than the pulp consistency of the pulp suspension charged to the mixing zone; passing the dewatered pulp suspension to the bleaching zone before its temperature can change substantially from the adjusted temperature; carrying out the bleaching with a bleaching agent at the selected bleaching temperature within the range from about 40 to about 95°C; and recycling the bleaching liquor recovered from the dewatering to the mixing zone while maintaining a temperature in the recycled liquor to bring the pulp suspension to within said range of the bleaching tempera- ture during the mixing with bleaching agent.
301281
Haggstrom Sten L.
Lindahl Jonas A.i.
Tiberg Ernst B.
Macrae & Co.
Mo Och Domsjo Aktiebolag
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