Abstract: The desulphurization of straight-run diesel fraction was studied in laboratory by catalytic oxidation-extraction method, including the selection of catalyst and extractant, the effect of catalytic oxidation conditions on the sulfur removal rate. Test results showed that using cobalt acetate as catalyst, air as oxidant and furfural as extractant, when treating 30 mL straight-run diesel under the conditions of a catalyst dosage of 0.4 g, a reaction temperature of 50℃, a reaction time of 60 min, a stirring speed of 600 r/min, an extractant to oxidized diesel volume ratio of 0.2 and using 3-stage extraction, the sulfur content of the refined diesel dropped from 215 μg/g to about 30 μg/g (a sulfur removal rate of 86%), which well met the requirement of Europe IV Emission Standard.

Key words: straight-run diesel, catalytic oxidation , extraction, desulfurization