The invention relates to the chemical processing of cellulose-containing raw materials, namely to the production of microcrystalline cellulose for use as a filler and binder in the chemical, chemical-pharmaceutical and food industries and medicine. The claimed method of obtaining microcrystalline cellulose from flax fibers includes organosolvent delignification of crushed flax fibers, acid treatment and hydrolysis of cellulose. Organosolvent delignification is carried out by a mixture of acetic acid and hydrogen peroxide with a concentration of 35% in the ratio of reagents 70:30, at a temperature of 95 ± 2 °C for 60-120 minutes, acid treatment of the resulting pulp is carried out with a mixture of hydrochloric and hydrofluoric acids with a concentration of 2 % at a temperature of 60 °C for 240 minutes, the hydrolysis process is carried out with a solution of hydrochloric acid with a concentration of 1 % at a hydro-module of 15:1 at a temperature of 95 ± 2 °C for 90 minutes. Technical result: reduction of chemical reagents consumption and reduction of production stages.

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