METHOD OF OBTAINING BETULIN Russian patent published in 2018 - IPC C07J53/00 C07J63/00 

FIELD: chemistry.

SUBSTANCE: method of obtaining betulin from birch bark comprising a preliminary activation of birch bark and betulin extraction of 86% ethanol solution, wherein the activation is carried out by ultrasonic treatment with intensity in the range of 10-15 W/cm² at a frequency of not less than 20-22 kHz at a temperature of 40°C for a period of 5-25 min and subsequent extraction is intensified by the ultrasonic impact reduced to 5 W/cm² of the fluctuation intensity at a temperature not less than 40°C for a time determined by the initial particle size of the birch bark.

EFFECT: reducing the duration of the betulin obtaining process.

1 dwg, 1 tbl, 2 ex