Process for the bleaching of cellulose pulp

Details Process for the bleaching of cellulose pulp Process for the bleaching of cellulose pulp

1978-04-17

1979-07-10

Bashore, S. Leon

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Chemical treatment after start or completion of mechanical...

162 25, 162 29, 162 61, 162 65, 162 71, 162 78, 162 83, 162 87, 162 89, D21C 910, D21C 912, D21C 916, D21C 918

Patent

active

041606930

ABSTRACT:
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.degree. C. to about -10.degree. C. of a temperature within the range from about 40.degree. to about 95.degree. 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.degree. 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 temperature during the mixing with bleaching agent.

REFERENCES:
patent: 1642978 (1927-09-01), Thorne
patent: 3186899 (1965-06-01), Madison et al.
patent: 4029543 (1977-06-01), Lindahl

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