FIELD: chemistry.
SUBSTANCE: birch bark from which bast fibre has been removed is crushed. Alkali and a mixture of isobutyl alcohol and water are then added. The reaction mass is then heated at boiling point for 2 hours. Use of isobutyl alcohol in the azeotropic mixture enables to obtain a hot reaction solution in form of a two-phase system. The reaction solution is separated by settling or separation on an organic alcohol-water and water-alcohol layer. Betulin is extracted from the alcohol-water layer through two-step crystallisation with intermediate evaporation. Suberin is obtained from the water-alcohol layer by distilling alcohol and evaporating the aqueous solution.
EFFECT: method simplifies the technique of extracting betulin and suberin from birch bark with high quality of the end products.
1 tbl, 1 ex
| Title | Year | Author | Number |
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