This work investigated the ultrasonic assisted oxidative desulfurization of bunker-C oil with TBHP/MoO 3
system. The operation al parameters for the desulfurization procedure such as ultrasonic irradiation time,
ultrasonic wave amplitude,catalyst initial concentration and oxidation agent initial concentration were
studied. The experimental results show that the present oxidation system was very efficientfor the
desulfurization of bunker-C oil and 35% sulfur was removed which was dependent on operational
parameters . The application of ultrasonic irradiation allowed sulfur removal in ashorter time.The stron-
ger the solvent polarity is, the higher the sulfur removal rate,but the recovery rate of oil is lower.The
sulfur comp ounds in bunker-C oil reacted with TBHP to produce corresponding sulfoxide,and further
oxidatio n produced the corresponding sulfone.