This article studied suitable condition for sulfur removal in high speed diesel by using oxidative desulfurization. Hydrogen peroxide was used to be the oxidant at ratio of oxidant per high speed diesel in the range of 0.02:1 to 0.07:1. Sulfur compound was extracted by solvent such as ethanol, acetic acid and acetone at ratio of solvent per high speed diesel in the range of 0.25:1 to 2:1. The temperature of this study was between 25 to 90℃ and silica-supported vanadium catalysts was used at different mesh sizes. Then, the sulfur contents of high speed diesel were evaluated and compared. High speed diesels before desulfurization unit in this study were taken from Rayong purifier Refinery. The result of this experimental reveals that the suitable condition for oxidation reaction of sulfur compounds was oxidized to sulfone and sulfoxide forms. It had higher polarity and boiling point than sulfur compound and transfer from high speed diesel to solvent layer. Hydrogen peroxide was used to be the oxidant at ratio of high speed diesel to hydrogen peroxide of 0.04 by using acetic acid as solvent at ratio of high speed diesel to acetic acid equal to 1:1 at 70℃. Silica-supported vanadium mesh of 60 mesh was used as the catalyst. Sulfur content in high speed diesel was reduced approximately 60.14 percent by weight in each oxidation reaction. If the oxidation reaction occurs in three times, it will reduce sulfur content in high speed diesel less than 0.005 percent by weight of diesel.
