METHOD OF PRODUCING A PLASTICIZER Russian patent published in 2019 - IPC C10G21/20 C10G21/16 

FIELD: technological processes.

SUBSTANCE: invention relates to a method of producing a plasticizer, comprising mixing a deasphaltizate extract and a heavy vacuum gas oil with a straight-run gasoline fraction in a weight ratio of 1:0.3–0.4 with subsequent countercurrent multistep extraction of carcinogenic polycycloarenes at temperature of 40–45 °C with a polar extractant. Method is characterized by that the polar extractant used is mixtures of N-methylpyrrolidone with alkylene glycol (C₂-C₄) of 80–90 wt% composition and 20–10 wt% respectively, with weight ratio of polar extractant to raw material 0.5–2:1.

EFFECT: high efficiency and selectivity of the process owing to reducing the overall ratio of extractant: raw material to obtain a plasticizer meeting the requirements of Directive 2005/69/EC.

1 cl, 8 ex, 6 tbl