Abstract: Experiments for the selective hydrogenation of FCC gasoline were carried out in a lab catalytic distillation unit using a NiMo/Al2O3 catalyst for selective hydrogenation and diene thioetherfication. The effects of H2/oil volume ratio, LHSV, reaction pressure and reflux ratio on the properties of light fraction obtained from the tower top were investigated. Under the optimum conditions of a reaction pressure of 0.70 MPa, a reaction temperature of about 140 ℃, a reflux ratio of 2, LHSV of 3 h-1 and H2/oil volume ratio of 10, the obtained light fraction had a total sulfur content of less than 20 μg/g, a mercaptan sulfur content of less than 2 μg/g and the removal rate of diolefins was more than 60%.

Key words: operation condition , catalytic distillation, FCC gasoline, selective hydrogenation, diolefins removal