METHOD OF OBTAINING ALKYL-AROMATIC COMPOUNDS Russian patent published in 2014 - IPC C07C2/66 C07C6/12 C07C15/73 C07C15/85 

FIELD: chemistry.

SUBSTANCE: invention relates to method of alkylating of aromatic compound to be alkylated with obtaining monoalkylated aromatic compound. method includes the following stages: A) supply of the first flow of raw material, including fresh aromatic compound to be alkylated, into the first reaction zone, which includes trans-alkylation catalyst; B) supply of the second flow of raw material, which includes polyalkylated aromatic compounds, into the first reaction zone; C) contact of said first and second flows of raw material with said trans-alkylation catalyst in said first reaction zone under conditions, suitable for realisation of reaction of trans-alkylation between said polyalkylated aromatic compounds and said aromatic compound to be alkylated, in fact, in liquid phase, with obtaining said monoalkylated aromatic compound; D) removal of the first output flow, which includes aromatic compound to be alkylated which did not react and said monoalkylated aromatic compound, from said first reaction zone; E) supply of said first output flow into fractioning system for division of said first output flow into the first light fraction, which includes said aromatic compound to be alkylated which did not react, and the first heavy fraction, including said monoalkylated aromatic compound; F) separation of monoalkylated aromatic compound from said first heavy fraction; G) supply of said first light fraction, which includes said aromatic compound to be alkylated, and third raw material flow, including alkylating agent, into the second reaction zone, which includes catalyst of alkylation; H) contact of said fist light fraction and the third flow of raw material with said catalyst of alkylation in said second reaction zone under conditions, suitable for alkylation of said aromatic compound to be alkylated by means of said alkylating agent, and obtaining the second output flow, which includes said monoalkylated aromatic compound, aromatic compounds to be alkylated which did not react and polyalkylated aromatic compounds; and I) separation of monoalkylated aromatic compound from said second output flow. In the first reaction zone, at least, part of one or more admixtures, contained in fresh flow of raw material, are removed.

EFFECT: obtaining monoalkylated aromatic compound.

15 cl, 2 dwg