FIELD: organic chemistry. SUBSTANCE: the process for preparing an extractive agent from mixtures thereof with normal hydrocarbons is carried out by thiomethylation of methyl ethyl ketone with a mixture of formaldehyde and sodium sulfide, their molar ratio being (1.5-2.5):(1.5-2.5):1, respectively at 15-25 C for 1 to 7 hours. EFFECT: more efficient preparation process. 3 tbl
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