METHOD FOR OBTAINING OIL PRODUCTS WITH LOW SULPHUR CONTENT BY DESULPHURIZATION OF EXTRACTS

摘要

The invention concerns a method for obtaining oil products such as diesel fuel with improved quality, from a gas oil fraction containing organosulphur compounds such as dibenzenethiophenes and/or their derivatives, with initial and final boiling points generally ranging between about 170 and 480 °C. Said method is characterised in that it comprises at least two steps which consist in: (a) liquid-liquid extraction wherein the diesel fuel fraction is contacted with a solvent so as to obtain a gas oil-type raffinate with low content of sulphur and aromatic compounds and an extract rich in solvent and with high content of sulphur and aromatic compounds; (b) oxidation of the extract sulphur compounds so as to obtain, after separation, a heavy gas oil-type hydrocarbon effluent with low sulphur content, and a residue comprising oxidised organosulphur compounds. The invention also concerns oil products obtained by said method which can be used either for the formulation of fuel for internal combustion engine with compression ignition (of the diesel type) or as fuel.