Abstract: Under the conditions of liquid hour space velocity (LHSV) of 0.30 h^-1, hydrogen partial pressure of 3.0 MPa, hydrogen-oil volume ratio of 100 and temperature of 360 ℃, a mixed feedstock A with mass ratio of FCC slurry to heavy cycle oil (HCO) of 3:1 was used, and a fixed-bed hydrogenation experiment was carried out to obtain the hydrogenated heavy fraction with a yield of 99.78%. Four fixed bed hydrotreating experiments were carried out with Middle East residua (MM) and mixed feedstock B (heavy distillate of hydrotreated A: MM = 7.98:100 by mass ratio) at different depths with constant space velocity of MM, four kinds of hydrotreated residue were obtained, and then MIP and DCC experiments were carried out with four kinds of hydrotreated residue, respectively. The results showed that when residue hydrotreating was combined with MIP, the yield of light oil (gasoline+diesel) increased by 2.20 percentage points compared with that of non-combined process using the slightly hydrotreated residue based on 100% MM feed, and the yield of light oil (gasoline+diesel) increased by 2.52 percentage points compared with that of non-combined process using the deep-hydrotreated residue. When residue hydrotreating was combined with DCC, the yield of propylene was 1.22 percentage points lower than that of non-combined process.

Key words: FCC slurry, fixed-bed residue hydrotreating, MIP process, DCC process, combined process