Abstract: The hydrotreating catalyst PHF-311 developed by PetroChina Research Institute of Petrochemical Technology for FCC feedstock pretreatment was successfully applied in the 1.0 Mt/a gas oil hydrotreating unit of PetroChina Dushanzi Petrochemical Company in September 2019. The calibration results show that under the process conditions of a reaction temperature of 358.5 ℃ ,a reaction pressure of 10.9 MPa, a volume ratio of hydrogen to oil of 699, a space velocity for main agent of 0.94 h^-1, the gas oil with sulfur mass fraction of 493 μg/g and nitrogen mass fraction of 474.8 μg/g, and carbon residue of 0.15% can be obtained, which is a high-quality catalytic cracking feedstock. The hydrotreated diesel with 6.2 μg/g of sulfur and 30.8 μg/g of nitrogen can be used as diesel blending component. From the operation of the unit, it could be seen that PHF-311 catalyst had higher activities of hydrodesulfurization, hydrodenitrification and residue carbon reduction, which could meet the requirements of enterprises for clean fuel production.

Key words: catalytic cracking, vacuum gas oil, hydrotreating, catalyst