METHOD AND DEVICE FOR PRODUCING PURIFIED STYRENE COMPOSITION FROM STYRENE-CONTAINING RAW MATERIAL Russian patent published in 2024 - IPC C07C15/46 C07C7/14 B01D9/00 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing a purified styrene composition, wherein the method involves providing a crude composition containing 70 wt.% or more styrene from total weight of crude composition and treating the crude composition in at least one crystallisation step. At least one crystallisation step includes at least one of the steps: a static crystallisation step and a dynamic crystallisation step. Crude composition contains one or more impurities selected from a group consisting of compounds containing a dye, oxygen-containing compounds, sulphur compounds, alpha-methylstyrene and arbitrary combinations of two or more said compounds. Purified styrene composition contains less than 2 parts by weight per million of all elemental sulphur contained in mercaptans, disulphides and thiophenes, and wherein the purified styrene composition contains less than 40 ppmw of impurities selected from the group consisting of phenylacetylene, a mixture of xylenes, ethylbenzene, cumene, ethyltoluene, n-propylbenzene and alpha-methylstyrene. Invention also relates to a device.

EFFECT: invention enables to obtain a styrene composition with a very high degree of purity.

15 cl, 4 tbl, 6 dwg