Process for the conversion of lignocellulosic material to...

Details Process for the conversion of lignocellulosic material to... Process for the conversion of lignocellulosic material to...

D - Textiles, Paper

21

C

9/16.5

D21C 3/02 (2006.01) D21C 1/08 (2006.01)

Patent

CA 1129163

16-235 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 a redox additive which is reduced in reaction with the wood and then reoxidized by contacting the preoxidation liquor with oxygen-containing gas, and then continuing the digestion in an alkaline medium at a temperature within the range from about 160 to about 200°C, also in the presence of a redox additive, but without any addition of oxygen.

336240

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