Process and apparatus for the deresination and brightness...

Details Process and apparatus for the deresination and brightness... Process and apparatus for the deresination and brightness...

D - Textiles, Paper

21

C

8/78, 92/60.1

D21C 9/10 (2006.01) D21C 9/08 (2006.01)

Patent

CA 1162358

PROCESS AND APPARATUS FOR THE DERESINATION AND BRIGHTNESS IMPROVEMENT OF CELLULOSE PULP ABSTRACT OF THE DISCLOSURE A process and apparatus are provided for the deresination and brightness improvement of cellulose pulp, by adjusting the pulp concentration to within the range from about 15 to about 35%; adding sufficient alkali to the pulp to bring the amount of alkali, calculated as NaOH, within the range from amount 0.5 to about 17 g/kg of water accompanying the pulp; adding sufficient oxidizing bleaching agent to the pulp to bring the amount of oxidizing bleaching agent to within the range from about 0. 2 to about 22 g/kg of water, subjecting the pulp to a mild, mechanical working in the bite of twin interdigitated rotating screws at an energy input of from 8 to 100 kWh per ton of pulp; removing and reacting the pulp with the added alkali and bleaching agent for from about 0.1 to about 5 hours; and then washing out dissolved resin from the pulp.

391674

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