The desulfurization of aromatic sulfur containing compounds in catalytic diesel oil was carried out using formic acid/hydroperoxide (30% in content) oxidation system, and later the oxidized organic sulfur compounds (sulfones) were separated by solvent extraction. The results show that different extracts have different abilities to extract sulfones from the diesel. Among the selected extracts, DMF and DMSO are the best. The total sulfur concentration can be reduced from 0.8% to 0.3% when the ratio of extr...