Abstract: In the process of deep hydrodesulfurization (HDS) of high sulfur residue, the refractory sulfur-containing compounds were most difficult to remove because of side chain substitution and strong spatial position effect, and metal (Ni + V) and carbon deposition on catalysts were accelerated. The research on catalyst grading ratio of hydrodemetallization (HDM) catalyst and HDS&HDCCR catalyst for reducing carbon residue was carried out. The results showed that the HDM rate increased with the increase of the residence time of the reaction stream on the HDM catalyst, and the HDS rate increased with the increase of the residence time of the reaction stream on the HDS&HDCCR catalyst, but after reaching a certain residence time (inflection point value), the increasing trend obviously slowed down. The new HDS&HDCCR catalyst had low initial HDS activity, and the activity increased and remained stable with the extension of operating time. Based on the research results of the gradation and the characteristics of HDM&HDS catalyst, an advanced catalyst gradation technology for high sulfur residue deep HDS was developed and applied in the fixed bed residue hydrotreating unit. The results showed that the new technology had good HDS activity and excellent stability, and the fixed bed residue hydrotreating unit could stably produce blending components of low sulfur heavy marine fuel on the premise of ensuring the supply of FCC feedstocks.

Key words: high sulfur residue, hydrogenation, low sulfur heavy marine fuel, components