Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Simultaneous mechanical defibration and chemical treatment
Patent
1981-12-03
1984-04-24
Chin, Peter
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Simultaneous mechanical defibration and chemical treatment
162 28, 162 56, 162 72, 162 78, 162 87, 162 90, D21B 104
Patent
active
044446217
ABSTRACT:
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 about 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.
REFERENCES:
patent: 4294653 (1981-10-01), Lindahl et al.
Chin Peter
Mo och Domsjo Aktiebolag
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