| US 7,585,803 B1 | ||
| Catalyst regeneration method | ||
| Scott J. Price, Chicago, Ill. (US); and Paul R. Cottrell, Arlington Heights, Ill. (US) | ||
| Assigned to UOP LLC, Des Plaines, Ill. (US) | ||
| Filed on Oct. 19, 2005, as Appl. No. 11/254,100. | ||
| Int. Cl. B01J 23/90 (2006.01); B01J 23/96 (2006.01); B01J 20/34 (2006.01); B01J 21/20 (2006.01); B01J 25/04 (2006.01); B01J 27/28 (2006.01); B01J 29/90 (2006.01); B01J 31/40 (2006.01); B01J 38/00 (2006.01); B01J 38/04 (2006.01); B01J 38/42 (2006.01); B01J 38/44 (2006.01); B01J 39/12 (2006.01); B01J 38/34 (2006.01); B01J 27/13 (2006.01) | ||
| U.S. Cl. 502—43 [502/20; 502/34; 502/35; 502/37; 502/38; 502/230; 208/140] | 18 Claims |
| 1. A method of operating a continuous system for a catalyst regeneration process wherein a regeneration section includes at
least a combustion zone, at least one oxygen boost zone, and a halogenation zone which method comprises:
a) continuously circulating an oxygen-containing recycle gas from a flue gas outlet to a recycle gas inlet in a recycle gas
loop, venting a vent gas comprising combustion products from the recycle gas loop and adding gas to the recycle gas loop;
b) passing catalyst particles containing a platinum group metal and having coke deposited thereon to the combustion zone and
contacting the catalyst particles with a portion of the oxygen-containing recycle gas and added nitrogen gas to combust coke
from the catalyst particles, wherein the oxygen-containing recycle gas and the added nitrogen gas together comprises from
about 0.5 to about 1.5 volume percent oxygen;
c) passing the catalyst particles from the combustion zone to the oxygen boost zone and contacting the catalyst particles
with a portion of the oxygen-containing recycle gas enhanced with additional oxygen containing gas to further combust coke
from the catalyst particles, wherein the recycle gas enhanced with additional oxygen containing gas comprises from about 1.5
to about 4 volume percent oxygen and the recycle gas enhanced with additional oxygen containing gas in the oxygen boost zone
has an elevated level of oxygen as compared to the oxygen-containing recycle gas and the added nitrogen gas together in the
combustion zone;
d) passing the catalyst particles from the oxygen boost zone to the halogenation zone and contacting the catalyst particles
with a halogen-containing gas and redispersing the platinum group metal on the catalyst particles; and
e) recovering a regenerated catalyst from the regeneration section.
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