FIELD: technological processes.
SUBSTANCE: ground birch bark is extracted by diethyl ether with separation of betulenol. Then birch bark residue is extracted by water with hydraulic module of 1:15-20 at the temperature of 95-100°C for 1.5-2.0 hours. Produced solution of water soluble substances is concentrated down to 1/3 of initial volume, saturated with sodium chloride, and produced residue is separated by filtration, filtrate is thrice extracted by ethyl acetate and concentrated down to 1/12-1/15 of initial volume, dissolved with chloroform, and proanthocyanidins are extracted.
EFFECT: invention makes it possible to achieve the specified purpose.
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