METHOD FOR PRODUCTION OF CELLULOSE FOR CHEMICAL PROCESSING Russian patent published in 1994 - IPC

FIELD: production of cellulose for chemical processing. SUBSTANCE: alkali digestion of cellulose-containing raw material of hardwood is carried out on spent solution from stage of cold pulp purification with content of hemicelluloses amounting to 0.13-5.2 %. Cold purification is carried out with alkali reagent based on sodium-hydroxide. Used as alkali reagent is spent solution from mercerization stage with content of hemicelluloses of 0.1-3.2 % . Mercerization is accomplished directly after bleaching with dryness of bleached cellulose mass of 25-55 %. Mercerization is carried out with use of sodium hydroxide, white kraft liquor or their mixture or oxidized white kraft liquor. EFFECT: higher efficiency. 2 cl, 1 tbl