Supression of hydrodesulfurization by polycyclic aromatic compounds in distillate hydrotreating

摘要

The presence of polycyclic aromatics has been found to suppress the rate of hydrodesulfurization (HDS) in distillate hydrotreating.Hydrodesulfurization reactions do not occur in isolation,but rather compete for the co-reactant hydrogen as well as for catalyst sites with aromatics saturation (HDA) reactions.Both these phenomena were explored as potential causes of the observed suppression of HDS by polycyclic aromatics in a series of pilot plant experiments and mathematical simulations.