Three-Lump Kinetics Model of Diesel Hydrodesulfurization

The kinetics of ultra-deep hydrodesulfuration(HDS) was investigated in a fixed-bed reactor with hydrofining catalysts. The influences of reaction temperature, hydrogen partial pressure and liquid hourly space velocity on HDS were studied respectively. By analyzing the desulfurization performances of sulfides in diesel, sulfides were divided into three types, and a three-lump HDS models was established. Apparent activation energy E, pre-frequency factor A and the grade value of hydrogen pressure at different temperatures were obtained. By assuming that apparent activation energies of three types of sulfides were constant, a three-lump kinetics model with first order was obtained by associating the pre-exponential factor of sulfides in diesel with density and boiling range. According to the numbers of distillates separated by boiling range, the relationship between pre-exponential factor and mean average boiling point was acquired. The results of the correlation coefficient(R2) and residual error of the equation indicate that the obtained kinetics model coincided well with the experiments, and the model is helpful for developing new ultra-deep hydrodesulfuration catalysts and processes. © 2018, Editorial Office of Acta Petrolei Sinica(Petroleum Processing Section). All right reserved.