METHOD OF PRODUCING CELLULOSE Russian patent published in 2016 - IPC D21C3/04 

FIELD: pulp and paper industry.

SUBSTANCE: invention relates to processing wastes, particularly to method of producing cellulose, which can be used in pulp and paper and chemical-pharmaceutical industries as sorbent and filtration material in equipment, as well as raw material for producing biofuels. Boiling of birch wood chips is carried out in a solution containing 15.0 wt%. of formic acid, 1.0-3.0 wt%. of hydrogen peroxide in presence of titanium dioxide as catalyst in amount of 1.0 % of absolutely dry wood weight, while stirring continuously, water duty equal to 6, temperature of 80-90°C for 2 hours with subsequent bleaching with solution containing 2.0-4.0 wt% of sodium hydroxide and 1.0-2.0 wt% of hydrogen peroxide, water duty equal to 8 at 90°C for 1-2 hours and separation of end product.

EFFECT: technical result is increased efficiency of procedure, improved environmental friendliness of process and increased yield of cellulose product with high content of cellulose due to usage of non-toxic solid catalyst, titanium dioxide.

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