FIELD: woodworking industry.
SUBSTANCE: invention refers to chemical milling. Birch bark not pre-divided into silver bark and inner bark is grinded that is followed with extraction with nonpolar solvent. Prepared extract is processed with 20-25% water alkali during 1.5-2.0 h to produce betulin. Then bark is extracted at 75-80°C during 1-1.5 h with aqueous-alcoholic-alkaline solution of 1.5% sodium hydroxide and 15-20% ethanol to produce bark extract. Residual bark is carbonised in water boiler reactor to produce carbonic sorbent.
EFFECT: invention enables to implement the specified object matter.
1 tbl, 1 dwg
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