Hydrodesulfurization reactions group kinetics of 'vacuum gas oil-deasphalted vacuum residues-heavy coker gasoil' feedstock in the presence of a Ni-6-PMonW12-n/gamma-Al2O3 catalysts

摘要

The organosulfur compounds of mixed raw materials-vacuum gas oil in a mixture with heavy coking gas oil reactions group kinetic were investigated during hydrotreating at a hydrogen pressure of 5 MPa at various temperatures (360, 390, 420 degrees C) and LHSV of 0.5, 1.0, 2.0 and 4.0 h(-1) in the presence of Ni-6-MonW12-n/gamma-Al2O3 sulfide catalysts, prepared on the base of phosphoromolybdenum and phosphorotungstenheteropolyacids. The total sulfur content was determined in feed and hydrogenates. A kinetic model describes the process of hydrodesulfurization of vacuum gas oil in hydrotreating on Ni-6-MonW12-n/gamma-Al2O3 catalysts based on phosphomolybdenum and phosphotungsten heteropolyacides (HPAs) has been selected. The adequacy of the kinetic model of the 2nd order was verified by means of the coefficient of determination and based on the values of the Fisher criterion. The optimal modes of the vacuum distillate hydrotreating process may be selected on the base of obtained data on the kinetics of hydrodesulfurization (HDS) reactions. The kinetic characteristics of the HDS and hydrodearomatization (HDA) reactions of the mixed feed compounds on Ni-6-MonW12-n/gamma-Al2O3 catalysts based on phosphor-molybdenum and phosphotungsten HPA were determined with the usage of chosen model. The Ni6PMo12/gamma-Al2O3 catalyst was most active one in the HDS reaction. The activity of catalyst samples in hydrogenation reactions was investigated. It was shown that the most active sample is Ni6PMo4W8/gamma-Al2O3.