METHODS AND SYSTEMS FOR SEPARATION OF STYRENE FROM STYRENE-CONTAINING RAW MATERIAL Russian patent published in 2015 - IPC C07C15/46 C07C7/08 B01D3/40 

FIELD: chemistry.

SUBSTANCE: invention relates to versions of a method for the extraction of styrene and support of an extraction solvent efficiency in a system for styrene extraction from a styrene-enriched raw material. One of the versions includes the following stages: (a) supply of the styrene-enriched raw material into an extraction distillation column, (b) discharge of the styrene-enriched flow from the extraction distillation column, with the styrene-enriched flow containing styrene and an extraction solvent; (c) supply of the styrene-enriched raw material into the column for the solvent separation, d) discharge of the styrene-depleted flow from the column for the solvent separation, with the quantity of styrene in the styrene-depleted flow being lower than in the styrene-enriched flow; e) separation of a part of the styrene-depleted flow, f) bringing a part of the styrene-depleted flow in contact with an organic solvent in an equilibrium liquid-liquid system, which has several equilibrium stages, with the formation of a washed extraction solvent, containing the light organic phase and the heavy organic phase, with the light organic phase passing to the following equilibrium stage and the heavy organic phase returning to the first equilibrium stage; and g) recycling the washed extraction solvent back to the extraction distillation column.

EFFECT: method makes it possible to use solvents in a rational way.

17 cl, 4 dwg