FIELD: chemistry.
SUBSTANCE: extract of plant material containing betulin is dissolved in a hydrocarbon solvent or mixtures thereof with boiling point in the range of 120…250°C, heated to boiling and boiled while stirring until complete dissolution of betulin. The insoluble fraction of polyolefins and phytosterols is separated by hot filtration of the obtained solution and dried in a vacuum at temperature 80°C. The filtrate is then cooled to temperature 0…5°C, wherein the precipitated betulin is filtered and also dried in a vacuum at temperature 80°C. Also, the mixture of hydrocarbons of the solvent can contain up to 20% aromatic hydrocarbons.
EFFECT: method achieves more complete extraction and separation of products of processing plant maerial.
2 cl, 2 ex, 1 tbl
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