Abstract: Hydrogenation pilot tests are carried out using the Middle East high sulfur residue mixed with FCC light cycle oil (LCO) as feedstock. The results show that LCO mixture with residue for hydrogenation has better hydrogenation performance and the amount of coke deposited on the residue hydrogenation catalyst is reduced. The commercial application results of RICP-Ⅱ process in three companies show that compared with RUN-2, both metal and carbon content on spent catalyst of RUN-4 are lower in the residue hydrotreating (RHT) unit in company A; the total pressure drop, radial temperature difference and temperature rise of reactors are significantly reduced after adding LCO in the RHT unit in company B; HDS, HDN and HDCCR are all promoted, but the effect on HDM is not obvious; high proportion of LCO is introduced in the RHT unit in company C; the mass fraction of LCO account is 26.33% of the total amount of processing, the highest mass ratio of LCO account is for more than 45% of the total reaction feed, the total pressure drop of the reaction system is lower than 2.0 MPa, the temperature rise is less than 70 ℃, and the maximum radial temperature difference is below 9 ℃ in the whole operation cycle for 1 261 days.

Key words: RICP, residue Hydrogenation, Light cycle oil