Abstract: A process to substantially reduce the sulfur content of a liquid hydrocarbon stream by contacting the hydrocarbon stream with an aqueous stream containing a mixture of one or more extraction agents selected from hypochlorites, cyanurates and alkali metal and alkaline earth metal hydroxides, optionally in the presence of a catalyst, to remove sulfur compounds.

Abstract: The process for the desulfurization of a sulfur-containing hydrocarbon mixture, such as a full-range, hydrotreated diesel oil, is accomplished with an aqueous oxidizing agent in the presence of a catalyst and a co-catalyst, and thereafter selectively removing the oxidized compounds by solvent extraction. Optionally, the foregoing steps are followed by solvent stripping and recovery, and a final polishing step.

Abstract: The reduction in the sulfur-containing content of diesel fuel is achieved by oxidation in the presence of a catalyst followed by a liquid-liquid countercurrent extraction.

Abstract: 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)6W12O40.H2O, Na2WO4, Li2WO4, K2WO4, MgWO4, (NH4)2MoO4, (NH4)6Mo7O24.4H2O, 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.