METHOD OF PRODUCING CELLULOSE Russian patent published in 2024 - IPC D21C3/00 

FIELD: pulp and paper industry.

SUBSTANCE: invention relates to pulp and paper industry, namely to methods of producing cellulose when processing hardwood by sulphate method and softwood by sulphite method. Method involves cooking wood with a cooking solution in the presence of a mixture of surfactants as an additive: a nonionic pentaoxyethylated tridecanoic acid monoethanolamide ester of formula C₁₂H₂₅CONCH₂CH₂O(C₂H₄O)₅H (non-ionic surfactant 1), cationic surfactant of dodecyldimethylbenzylammonium chloride of formula {C₁₂H₂₅(CH₃)₂(CH₂C₆H₅)]N}Cl and a nonionic surfactant of oxyethylated monoalkylphenol based on propylene trimers of formula C₉H₁₉C₆H₄O(C₂H₄O)₆H (non-ionic surfactant 2). Ratio of nonionic surfactants 1 : cationic surfactant : nonionic surfactant 2 is 1:1:9 – 2:2:8 at consumption of 0.005-0.05% of the weight of absolutely dry wood.

EFFECT: invention enables to obtain cellulose with low content of lignin, resins and fats, increased reactivity to viscose formation and increased content of α-cellulose with reduced consumption of surfactants.

3 cl, 1 tbl