PRODUCTION OF CELLULOSED SEMI-FINISHED PRODUCT Russian patent published in 2014 - IPC D21C1/00 

FIELD: process engineering.

SUBSTANCE: invention relates to production of cellulose of wood and can be used in pulp-and-paper industries for production of paper and cardboard. Proposed method comprises impregnation of wood ships with water solution of sodium hydroxide or potassium hydroxide with concentration of 80…180 g/l in units Na₂O, containing hydrazine in amount of 20…25% of dry wood weight at 20…40°C for 6…24 h. Dripping liquid phase is extracted. Isobutyl alcohol is added to said mass, temperature is increased to 120…150°C and boiled thereat for 1…4 h.

EFFECT: higher yield of cellulose, decreased consumption of hydrazine, alkalis, energy, simplified process.

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