FIELD: organic chemistry, chemical technology. SUBSTANCE: invention relates to method for treatment of isoquinoline. Isoquinoline fraction obtained by treatment of bitumen coal tar and comprising about up to 1 wt.-% of quinoline and about up to 8 wt.-% of quinaldine is cooled to temperature 4-18 C and suspension crystallization is carried out by centrifugation of mother liquor. EFFECT: improved treatment method. 2 cl, 5 tbl, 5 ex
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