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AssigneeTotal Raffinage Distribution S.A.
InventorsPedro Da Silva, Raphaël Le Gall
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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. The method includes 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 oxidased organosulphur compounds. The invention also concerns oil products obtained by said method which can be used either for the formation of fuel for internal combustion engine with compression ignition (of the diesel type) or as fuel.
Method for obtaining oil products of the gas oil type with improved quality, from a gas oil fraction containing organosulfur compounds of the dibenzenethiophene type and/or their derivatives, with initial and final boiling points generally ranging between approximately 170 and 480° C., characterized by the fact that it consists of at least two steps, one, a), liquid-liquid extraction in which the gas oil fraction is put in contact with a solvent, so as to obtain a raffinate of the gas oil type with a low content of sulfur and aromatic compounds and an extract rich in solvent and with a high content of sulfur and aromatic compounds, and the other b) oxidation of extract sulfur compounds, so as to obtain, after separation, a heavy gas oil type hydrocarbon effluent with a low sulfur content, and a residue that comprises oxidized organosulfur compounds.
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