Integrated heavy oil cracking process utilizing catalyst separated from cracking in pretreating zone
AssigneePullman Incorporated
InventorJames R. Murphy
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Abstract
An integrated process is described wherein a heavy oil catalytic cracking unit is integrated with a pretreating zone. In the pretreating zone, petroleum feedstock is contacted, in the presence of hydrogen, with used equilibrium catalyst purged from the cracking zone to reduce the metals, carbon residue, and sulfur content of the petroleum feedstock prior to charging the feedstock to the cracking zone of the heavy oil catalytic cracking unit.
Claims17
An integrated heavy oil cracking process for catalytically cracking a petroleum feedstock containing at least about 5 ppm metals and having a Ramsbottom carbon residue of from about 2 weight percent to about 25 weight percent comprising the steps of:
- a. contacting the feedstock in a pretreating zone in the presence of 700 to 3000 psig partial pressure of hydrogen at a temperature from about 750.degree. F. to about 850.degree. F. with equilibrium catalyst withdrawn from a heavy oil cracking unit;
- b. separating the treated feedstock from the equilibrium catalyst;
- c. feeding the separated, treated feedstock of step (b) to a fluid catalytic cracking zone of a heavy oil cracking unit in the presence of a fluid cracking catalyst to produce a cracked effluent;
- and p1 d. withdrawing equilibrium catalyst from the heavy oil cracking unit for use in the pretreating zone of step (a).
Dependencies are inferred from the claim text.