Abstract: The hydrotreating process conditions of high sulfur residue were investigated. The results show that increasing the reaction temperature and reducing the LHSV are beneficial for increasing the hydrodesulfurization reaction effect; lowering the reaction temperature, reducing the hydrogen partial pressure and increasing the LHSV are beneficial for increasing the hydrodesulfurization selectivity. In the case of achieving the same desulfurization rate, increasing the reaction temperature can greatly increase the LHSV, thereby reducing the processing cost of residue hydrogenation. Research on the combined process of residue hydrogenation and delayed coking shows that as the depth of hydrodesulfurization increases, the remaining sulfur compounds in the hydrogenated residue are more likely to remain in petroleum coke. The combined process can greatly reduce the sulfur mass fraction of petroleum coke to below 3.0%, which can meet the index requirements of low-sulfur coke. Compared with delayed coking process, the combined process can produce more high-value products, and the properties of the coking products are also better.

Key words: residue hydrotreating, delayed coking, low-sulfur coke, combined process