FIELD: chemistry of natural compounds.
SUBSTANCE: processing comprises isolation of betulin from ground bark via extraction with organic solvent within closed extraction technological complex. Extraction is effected in flow-type extractor at solvent boiling temperature while continuously withdrawing extract to evaporation still and solvent vapors from extractor and from evaporation still to condenser. Solvent vapors are condensed and condensate is recycled. Betulin, if necessary, is purified. Extracted bark is treated, at heating and stirring, with water-alcohol alkali solution, which is not being removed from extractor. Hot reaction mass is then filtered to obtain non-dissolved cellolignin and filtrate containing suberic acid sodium salts. Filtrate is evaporated and simultaneously clarified with hydrogen peroxide.
EFFECT: enabled easily obtaining betulin and sodium suberate on the same installation and in the same cycle.
7 cl, 1 dwg, 1 tbl, 18 ex
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