METHOD OF PRODUCING ALKYL ARYL SULPHONIC ACIDS AND ALKYL ARYL SULPHONATES Russian patent published in 2012 - IPC C07C309/31 C07C303/06 C07C2/66 C07C15/107 C11D1/22 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing a product containing alkyl aryl sulphonate, involving the following steps: (a) contacting an alkyl aromatic hydrocarbon with sulphur trioxide at 25-120°C and pressure of up to 50 kPa to obtain a first liquid product containing alkyl aryl sulphonic acid and a gaseous effluent stream containing sulphur oxides, sulphuric acid and alkyl aryl sulphonic acid; (b) separating the first liquid product from the gaseous effluent stream; (c) purifying the gaseous effluent stream to obtain a cleaned gaseous stream and a second liquid product; (d) returning the second liquid product to the first liquid product obtained after the separation step (b) to obtain a third liquid product containing alkyl aryl sulphonic acid, followed by neutralisation thereof; wherein the alkyl aromatic hydrocarbon is obtained by contacting an aromatic hydrocarbon with an olefin under alkylating conditions, and said olefin is obtained by dehydrogenation of a Fischer-Tropsch derived paraffin material.

EFFECT: efficient and environmentally acceptable method of obtaining a product containing alkyl aryl sulphonic acids, which does not have significant negative effect on properties of the end alkyl aryl sulphonates.

7 cl, 4 ex