Influence of diesel fraction feed rate on silicon removal by the protective layer catalyst

The influence of diesel fuel feed rate on silicon adsorption on NiMo/AlO-protecting layer catalyst during hydrotreating was studied. Straight-run diesel fraction containing decamethylcyclopentasiloxane additive in the amount of 200 million as an additional source of silicon was used as a feedstock Three series of experiments of 60 hours duration each were carried out at specific feed rates equal to 0.75, 1.5 and 3.0 h. It was found that as the specific feed rate increases, the silicon content in the protective layer catalyst increases. To evaluate the efficiency of the adsorption process, the silicon recovery factor was used, which is equal to the ratio of the amount of adsorbed (extracted from the feedstock) silicon to the supplied during the time of the experiment. In the rate range of 0.75-3.0 h, the silicon recovery factor decreased from 0.93 to 0.61 due to more intensive filling of active centers on the catalyst surface. The influence of external mass transfer on the silicon adsorption process was evaluated.