Patent ID: 8529753

Claim:
A combined process for hydrotreating and catalytic cracking of residue, comprising: contacting residue, catalytic cracking recycle oil and optional distillate oil with a residue hydrotreating catalyst to carry out a hydrotreating reaction under hydrotreating reaction conditions in the presence of hydrogen, and separating the reaction products obtained to obtain gas, hydrogenated naphtha, hydrogenated diesel oil and hydrogenated residue; and contacting the hydrogenated residue and optional conventional catalytic cracking feedstock oil with a catalytic cracking catalyst to carry out a cracking reaction under catalytic cracking reaction conditions, and separating the reaction products obtained to obtain dry gas, liquefied gas, catalytic cracking gasoline, catalytic cracking diesel oil and catalytic cracking recycle oil; characterized in that the process further comprises a step for removing acidic solid impurity from the catalytic cracking recycle oil, which step makes the catalytic cracking recycle oil contain less than 30 ppm acidic solid impurity with a particle size of less than 10 μm, before the step of contacting and reacting the residue, catalytic cracking recycle oil and optional distillate oil with the residue hydrotreating catalyst.