METHOD OF CLEANING DIESEL FUEL FROM SULPHUR COMPOUNDS Russian patent published in 2016 - IPC C10G21/16 C10G27/12 C10G31/00 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil processing industry and can be used for cleaning diesel fuel with high content of different organic sulphur compounds, including thiophenes, benzo-dibenzothiophenes and substituted analogues. Method of cleaning diesel fuel from sulphur compounds includes a step for oxidising sulphur compounds in diesel fuel in presence of oxidation catalyst at high temperature, step for liquid-liquid counterflow extraction removing oxidized sulphur compounds, separation of cleaned diesel fuel, method is characterised by that fuel oxidation step is carried out in reaction mixture containing catalytically effective amount of catalyst - molybdenum in hydrogen peroxide and protonated phase-transfer agent, reaction mixture is subjected to ultrasound then in oxygenated reaction mixture is added effective amount of flocculant with subsequent separation into water phase containing catalyst, and oxidised diesel fraction is extracted, extraction stage is carried out by extraction agent containing a mixture of isopropyl alcohol and glycerine in volume ratio of oxidised diesel fraction: extractant, equal to 1:1-3, respectively, with subsequent separation of cleaned diesel fuel from extract and step for regeneration of extractant from extract.

EFFECT: method provides high depth of extracting sulphur compounds, at that is cheap, since it enables to return into process both catalyst and extractant.

10 cl, 4 tbl, 1 dwg, 3 ex