Photochemical Oxidation−Ionic Liquid Extraction Coupling Technique in Deep Desulphurization of Light Oil

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A photochemical oxidation and ionic liquid ([Bmim]PF 6 ) extraction coupling technique was employed in deep desulphurization of light oil with the presence of photo oxidant H 2 O 2 . In this process, [Bmim]PF 6 was utilized to be the extractant and photochemical reaction medium to promote the oxidation of dibenzothiophene (DBT). The deep oxidative desulfurization, 99.5% removal rate of DBT from n -octane and 90.6% sulfur removal rate of actual light oil, was achieved under mild conditions of room temperature and atmospheric pressure. The ionic liquid [Bmim]PF 6 was recycled eight times with a slight decrease in desulfurization efficiency.