FORFARANDE FOR HARTSHALTSMINSKNING VID FRAMSTELLNING AV CELLULOSAMASSOR UR LIGNOCELLULOSAMATERIAL

FORFARANDE FOR HARTSHALTSMINSKNING VID FRAMSTELLNING AV CELLULOSAMASSOR UR LIGNOCELLULOSAMATERIAL

16-242 PROCESS AND APPARATUS FOR THE DERESINATION OF CELLULOSE PULP A process and apparatus are provided for the deresination 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, cal...

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Bibliographische Detailangaben
1. Verfasser: J A I LINDAHL
Format: Patent
Sprache:swe
Schlagworte:
APPARATUS THEREFOR
PAPER-MAKING
PRODUCTION OF CELLULOSE
PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS
REGENERATION OF PULPING LIQUORS
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Zusammenfassung:16-242 PROCESS AND APPARATUS FOR THE DERESINATION OF CELLULOSE PULP A process and apparatus are provided for the deresination 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 NaON, within the range from about 2 to about 17 g/kg of water accompanying the pulp; 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 for from about 0.1 to about 5 hours, and then washing out dissolved resin from the pulp.