INTEGRATED METHODS FOR MERCAPTAN EXTRACTION AND/OR DESULPHURISATION, COMBINED WITH THERMAL OXIDATION AND FLUE GAS TREATMENT Russian patent published in 2022 - IPC C10G21/10 B01D53/00 B01D47/00 

FIELD: treatment of gases.

SUBSTANCE: invention relates to integrated methods for extracting mercaptans and/or for desulphurisation, combined with thermal oxidation and flue gas treatment. Described is an integrated method for extracting mercaptans and/or for desulphurisation, combined with thermal oxidation and flue gas treatment, for reducing the content of sulphur in hydrocarbon raw materials, including the following stages: directing the flow of spent liquid into a surge tank for spent alkali, wherein the spent liquid contains at least one of: a mixed flow of amines and alkali from the mercaptan removal unit; a flow of spent alkali from the mercaptan removal unit; a flow of spent naphthene-containing alkali from the kerosene desulphurisation unit; a flow of spent sulphide-, phenol-/cresol-containing alkali from the benzene desulphurisation unit, the kerosene desulphurisation unit, or both units; or a flow of spent alkali from another process unit; passing the mixed flow of spent alkali from the surge tank for spent alkali to the thermal oxidation and quenching section of the thermal oxidation system, wherein the mixed flow of spent alkali contains at least one sulphur compound, and the thermal oxidation system comprises a thermal oxidation and quenching section, a solid particle removal section, and a sulphur dioxide removal section; oxidating at least one sulphur compound in the thermal oxidation and quenching section, ensuring the formation of solid particles of oxidised sulphur and carbonate in flue gas; separating part of solid particles of oxidised sulphur or carbonate from the flue gas in the solid particle removal section; converting part of solid particles of oxidised sulphur in the sulphur dioxide removal section by bringing the flue gas into contact with the alkali, ensuring the formation of sodium sulphate or sulphite solid particles; and removing part of one or more of: solid particles of oxidised sulphur or solid particles of carbonate.

EFFECT: reduced amount of sulphur in hydrocarbon raw materials.

10 cl, 3 dwg, 1 ex