FIELD: wood working industry.
SUBSTANCE: invention relates to wood chemical industry. Waste wood of aspen is chopped till particle size is less than 1 mm, is dried on air till moisture content is not more than 18%, raw material is watered at a temperature of 18-25°C with the following ratio of the raw material: extractant = 1:1.5-2.5, within 10-24 hours, further mechanical pressing of extractant and concentrating it in a vacuum at a temperature of not higher than 40°C till content of total solids is from 3.5 to 100%.
EFFECT: invention allows fulfilling the specified purpose.
10 ex, 3 tbl
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