FIELD: organic chemistry. SUBSTANCE: bottom residues is treated with aqueous solution of sodium hydroxide in mixing ratio of 3-4 % by weight in presence of ethylene glycol at temperature of 101-105 C, with weight ratio of melted bottom residue, sodium hydroxide and ethylene glycol being 1: (3.3-4.5): (0.8-0.12). The end product is separated at pH ranging from 11.0 to 11.3, yield: 20-26% , m. p. 130 C. EFFECT: increased purity.
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