FIELD: wood industry. SUBSTANCE: softwood tall pitch is hydrolyzed with alkali and hydrolyzate is extracted with alcohol-gasoline mixture at ratio from 1:12 to 1:20, respectively, at 25-35 C. Product is obtained by crystallization from ethylacetate solution containing 5-8% water at 5- 15 C. EFFECT: simplified process and essentially improved quality of product. 1 tbl, 8 ex
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Authors
Dates
1999-04-10—Published
1998-03-17—Filed