METHOD OF OBTAINING OIL PLASTICISER Russian patent published in 2014 - IPC C10G21/06 C10G21/16 C10G21/20 C10G21/22 C10G19/02 

FIELD: chemistry.

SUBSTANCE: invention relates to the chemical and oil-processing industry. The invention deals with a method of obtaining an oil plasticiser, which includes purification of oil fractions with selective solvents. An extract is preliminarily diluted with a ketone-aromatic solvent or the ketone-aromatic solvent with a mixture with n-methylpyrrolidone or dimethylsulphoxide with a weight ratio extract:solvent of 1:0.1-0.5. Extraction is carried out at a temperature of 25-55°C by the ketone-aromatic solvent or a mixture of polar solvents: acetone, which contains 5-30% of n-methylpyrrolidone or dimethylsulphoxide with a weight ratio extract:mixture of polar solvents of 1:3.5-4.0 in the presence of an anti-solvent, reducing the diluting ability and increasing the selectivity of the solvent, and as such applied is a water solution of 10-25% concentration of sodium hydroxide or iron sulphate in a quantity of 10-50% to a raw material, obtained raffinate is applied as the target product.

EFFECT: obtaining an ecologically safe plasticiser with low content of polycyclic arenes (PCA) and general sulphur.

2 cl, 1 tbl, 7 ex