METHOD OF PRODUCING BETULIN Russian patent published in 2012 - IPC C07J53/00 C07J63/00 

FIELD: chemistry.

SUBSTANCE: method involves preliminary grinding of birch bark to 0.1 mm particles, followed by hydrolysis while boiling in 15-25% aqueous solution of an alkali with hydromodulus of 8-10 for 2-3 hours. The alkaline hydrolysate is then filtered and washed on a filter with water until neutral water is obtained with subsequent recrystallisation from ethanol or isopropanol. The method enables to achieve 95-97% extraction of betulin from birch bark.

EFFECT: simplification of the method by cutting the number of steps of the process, faster extraction of the end product, avoiding use of highly flammable alcohols.

1 cl, 2 tbl, 1 ex