Catalytic process for deep oxidative desulfurization of...

C - Chemistry – Metallurgy – 10 – G

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C10G 27/12 (2006.01) B01J 23/22 (2006.01) B01J 23/28 (2006.01) B01J 23/30 (2006.01)

Patent

CA 2662627

Sulfur-containing compounds, including specifically thiophenic compounds, in a liquid hydrocarbon feedstream are catalytically oxidized by combining the hydrocarbon feedstream with a catalytic reaction mixture that includes a peroxide that is soluble in water or in a polar organic acid, at least one carboxylic acid, and a catalyst that is a transition metal salt selected from the group consisting of (NH4)2WO4, (NH4)6 W12O40. H2O, Na2WO4, Li2WO4, K2WO4, MgWO4, (NH4)2MoO4, (NH4)6 Mo7O24. 4H2O, MnO0 and NaVO3; the mixture is vigorously agitated for a time that is sufficient to oxidize the sulfur-containing compounds to form sulfoxides and sulfones; the reaction mixture is allowed to stand and separate into a lower aqueous layer containing the catalyst and an upper hydrocarbon layer that is recovered and from which the oxidized sulfur compounds are removed, as by solvent extraction, distillation or selective adsorption. The process can be used to reduce the sulfur content of liquid transportation fuels to 10 ppm, or less.

Les composés soufrés, et spécifiquement les composés thiophéniques, présents dans un flux d'hydrocarbure sont oxydés catalytiquement par combinaison de ce flux d'hydrocarbure avec un mélange de réaction catalytique comprenant un peroxyde soluble dans l'eau ou dans un acide organique polaire, au moins un acide carboxylique et un catalyseur constitué par un sel de métal de transition pris dans le groupe composé de (NH4)2WO4, (NH4)6 W12O40. H2O, Na2WO4, Li2WO4, K2WO4, MgWO4, (NH4)2MoO4, (NH4)6 Mo7O24. 4H2O, MnO0 et NaVO3. On agite vigoureusement ce mélange pendant un laps de temps suffisant pour oxyder les composés soufrés et les transformer en sulfoxydes et en sulfones. On laisse reposer le mélange de réaction pour qu'il se sépare en une couche inférieure aqueuse contenant le catalyseur et une couche supérieure hydrocarbonée qui est récupérée et dont les composés soufrés oxydés sont éliminés par extraction par solvants, distillation ou adsorption sélective. Ce procédé peut s'utiliser pour ramener la teneur en soufre de carburants de transport liquides à 10 ppm ou moins.

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