METHOD OF PURIFYING ALKYL AROMATIC COMPOUNDS Russian patent published in 2011 - IPC C07C7/04 C07C7/12 B01D15/00 C11D3/18 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of purifying alkyl aromatic compounds with an alkyl chain comprising 9-25 carbon atoms, involving the following steps: i) separation of a mixture of alkyl aromatic compounds in a fractionation column, which separates 60-85 wt % of the starting material through the top part the column to obtain a light fraction and a heavy fraction, ii) separation of the heavy fraction from step (i) in a fractionation column which works at pressure in the top part between 0 and 0.1 MPa (0-1 bar), at temperature in the bottom part between 175 and 290°C and temperature in the top part between 90 and 200°C, to obtain a light fraction and a heavy fraction, iii) removing chromophore precursors from the light fraction from step (ii) via percolation filtration through a fixed layer used to clean solid substance, iv) removing light by-products obtained at step (iii) using a distillation column which works at temperature between 60 and 250°C, v) mixing the purified alkylate obtained at step (iv) with a light fraction obtained during distillation at step (i).

EFFECT: use of the present method enables to obtain detergents with low colour grade owing to sulphonation.

16 cl, 2 ex, 6 tbl, 6 dwg