Abstract: In view of the problem that the production of high sulfur petroleum coke from delayed coker may be restricted in market, the feasibility of on-line co-production of high-pressure steam from coke in catalytic cracking of inferior vacuum residue with high carbon residue was studied. Using inferior Middle East mixed vacuum residue with 18.62% of carbon residue as feed and FCC equilibrium catalyst as catalyst, the effects of reaction temperature, mass ratio of catalyst to oil and space velocity on the catalytic cracking of vacuum residue were investigated in a fixed fluidized bed reactor, and the use of the products was discussed according to their properties. The results showed that the process route of inferior vacuum residue with high carbon residue catalytic cracking combined with generating high-pressure steam was feasible. With the increase of reaction depth, the dry gas and coke yields increased, and the total liquid yield decreased. The processing conditions could be flexibly adjusted according to the product demand to produce more distillate oil or more steam. Under different reaction conditions, the total yield of ethylene, propylene and butene was lower than that of typical catalytic cracking, and the content of aromatics in the distillates was relatively high, which could produce light aromatics and also be used as feedstock for the production of graphite-like carbon materials.

Key words: carbon residue, vacuum residue, catalytic cracking, vapor