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(11) | EP 1 043 384 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Improved residual oil fluid catalytic cracking process with catalyst having increased metals tolerance |
| (57) An improved residual oil fluid catalytic cracking process for reducing catalyst deactivation
caused by vanadium and/or sodium deposited on circulating catalyst used in the process
from a residual oil feed, which process includes the steps of; contacting a residual
oil feed in a fluid catalytic cracking reactor with hot regenerated cracking catalyst
under hydrocarbon cracking conditions to convert the residual oil feed into lower
molecular weight hydrocarbon product vapors and form a spent catalyst containing carbonaceous
deposits including vanadium and/or sodium; separating a majority of the lower molecular
weight hydrocarbon product vapors from the spent cracking catalyst to form separated
product vapors and separated spent catalyst containing entrained hydrocarbon vapors;
processing the separated product vapors into desired product fractions; subjecting
the separated spent catalyst to stripping to remove therefrom a majority of the entrained
hydrocarbon vapors; contacting the resulting stripped spent catalyst in a regenerator
with an oxygen-containing regeneration gas under catalyst regeneration conditions
which include a combination of a regeneration temperature and an oxygen level in the
regeneration gas which is effective to burn off the spent catalyst a majority of the
carbonaceous deposits, while leaving a majority of the vanadium and/or sodium on the
catalyst in less than completely oxidized form, and thereby produce a regenerated
catalyst having a carbon level reduced from that of the spent catalyst and containing
vanadium and/or sodium, a majority of which is in less than the completely oxidized
form, and; returning the regenerated catalyst to the reactor. |