Abstract: The slurry from No. 2 catalytic cracking unit of SINOPEC Maoming Company was used as the research object, the process of slurry-bed hydrogenation was simulated by autoclave reaction with dispersed Co-Mo catalyst, and the effects of initial hydrogen pressure, reaction time, catalyst addition amount and reaction temperature on the product were investigated. The results showed that under the conditions of initial hydrogen pressure of 3 MPa, reaction time of 120 min, catalyst mass fraction of 5 000 μg/g and reaction temperature of 400 ℃, the content of sulfur and nitrogen in the product was 0.44% and 0.14%, respectively, which could meet the requirement of needle coke raw materials; the yield of heavy fraction and aromatics (tricyclic + tetracyclic) were 73.8% and 48.9%, respectively, which were 3.8 percentage points and 12.9 percentage points higher than that of the existing industrial pretreatment technology, respectively, indicating that the slurry-bed hydropretreatment process of FCC slurry could produce the high-quality needle coke raw material. At the same time, it had the technical advantages of high yield of heavy fraction and low loss rate of tricyclic and tetracyclic aromatic hydrocarbons.

Key words: FCC slurry, slurry bed hydrogenation, needle coke