Abstract: The RICP technology (Residue Integrated Combination Process) was adopted after revamping of FCC unit of PetroChina Sichuan Petrochemical Co. Ltd. The vacuum residue mixed with heavy cycle oil from FCC unit was used as hydrotreating feed and then the hydrotreated effluent was processed in FCCU. By this technology, the properties of FCC feed are significantly improved: the carbon residue reduces by 0.47 percentage point, the content of hydrogen increases by 0.3 percentage point, the content of saturated hydrocarbon increases by 4.26 percentage points, and the content of resin and asphaltene significantly declines. The improved properties of the FCC feed increase FCC conversion rate and the total liquid yield by 0.67 percentage point and 1.42 percentage points, respectively. While the coke and slurry yield reduced by 0.63 percentage point and 0.85 percentage point, respectively. The cetane number of diesel fraction also improved.

Key words: catalytic cracking, residue hydrotreating, heavy cycle oil, recycle