Abstract: In order to adjust the product structure economically and efficiently, experimental study on reducing diesel/gasoline ratio by blending residue hydrotreater diesel into FCC feed was carried out. The results showed that, compared with the RFCC residue feed, the residue hydrotreater diesel has better cracking performance and gasoline selectivity. The conversion rate was as high as 79.46%, and the gasoline yield was up to 62.72%. When blended with 5.34% of residue hydrotreater diesel, diesel production could be reduced by 198.4 t/d, and the high octane number gasoline production increased by 154.1 t/d, resulting in a significant reduction of diesel/gasoline ratio, meanwhile the octane number of gasoline increased by 0.2 unit.

Key words: catalytic cracking, residue hydrotreater diesel, diesel/gasoline ratio, octane number, gasoline