Abstract:

The product distributions of simulative slurry-bed hydrocracking and coking with Venezuelan atmospheric residue (VAR) were studied in an autoclave and a coking still pilot plant, respectively. The physical and chemical properties and average structural parameters of hydrocracking bottom oil were investigated. The results of single coking process and slurry-bed hydrocracking-coking combined process were compared. The results show that though the quality of the unconverted bottom oil is poor and the residue carbon is high, the alkyl carbon rate and content of saturates and aromatics can reach 39%-50% and 0.14-0.24, respectively, indicating a certain cracking ability of hydrocracking bottom oil. Compared with the single coking process, the slurry-bed hydrocracking-coking combined process has much higher liquid yield and diesel/gasoline ratio, and lower coke. It is concluded that the slurry-bed hydrocracking-coking combined process for processing Venezuela atmospheric residue is feasible.

Key words: slurry-bed hydrocracking, hydrocracking bottom oil, coking, liquid yield