METHOD OF BIRCH BARK PROCESSING Russian patent published in 2009 - IPC A61K36/00 C08H5/04 C07J9/00 

FIELD: production processes.

SUBSTANCE: invention refers to wood working and wood chemical industries. Birch bark is broken down, mixed with liquid, the mixture is held at temperature higher than mixture freezing temperature, then triterpene compounds are separated from lingo-adipic residue with the following filtration and drying. Birch bark is additionally broken down by method of impact-abrasing and/or abrasing effect till obtaining birch bark flour. Birch bark flour is mixed with liquid with density of 0.999-0.958 kg/m³. Mixture is held for 0.1-10 hours and then separated by flotation to hydrophobic and hydrophilous fraction. Solution remaining after separation is condensed and dried. Obtained hydrophobic fraction - mixture of triterpene compounds - is exposed to recrystallisation in ethanol with activated charcoal and then betuline, solution of triterpene compounds in ethanol and mixture of triterpene and polyphenol compounds at carbon matrix is obtained. Or triterpene compounds mixture is separated to fractions in carbon-dioxide extractor and betuline, dry mixture of triterpene and polyphenol compounds are obtained. Hydrophilous fraction - lingo-adipic flour - is separated from liquid and dried out.

EFFECT: increase of environmental safety and method effectiveness.

6 cl, 4 ex, 3 dwg