FIELD: organic chemistry. SUBSTANCE: preparation of an extractive agent of aromatic hydrocarbons from mixtures thereof with normal hydrocarbons by triomethylation of acetone with a mixture of formaldehyde and sulfide-alkali waste comprising 0.2-3 wt sulfide sulfur and 0.2-3 wt mercaptan sulfur at an acetone to formaldehyde to total sulfur weight ration of 1.875-2.375: 0.975-1.1: 1 at a temperature of 55-65 C. EFFECT: more efficient preparation process. 3 tbl
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