D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
9/22
D21C 3/26 (2006.01) D21C 1/08 (2006.01)
Patent
CA 1162703
16-235 CIP PROCESS FOR THE CONVERSION OF LIGNOCELLULOSIC MATERIAL TO CELLULOSE PULP BY ALKALINE PREOXIDATION FOLLOWED BY ALKALINE OXYGEN-FREE DIGESTION, BOTH IN THE PRESENCE OF A REDOX ADDITIVE ABSTRACT OF THE DISCLOSURE A two-stage process is provided for the conversion of ligno- cellulosic material, for instance, wood, to cellulose pulp, first oxidizing the lignocellulosic material to form aldonic acid end groups, preferably bound with 1,4-glycosidic bonds, in the polysaccharides, in an alkaline medium in the presence of the oxidized form of a redox additive which is converted into a reduced form in reaction with the wood and/or products formed from the wood, withdrawing the alkaline medium and then reoxidizing the reduced form of the redox additive in the absence of the lignocellulosic material at a rate to maintain the oxidized form of the redox additive in a major proportion in the alkaline medium during oxidation of the lignocellulosic material by contacting the withdrawn alkaline medium with oxygen-containing gas, and then continuing the digestion in an alkaline medium at a tempera- ture within the range from about 160 to about 200°C, also in the presence of a redox additive, but without any addition of oxygen.
384551
Macrae & Co.
Mo Och Domsjo Aktiebolag
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