| CPC B01J 38/12 (2013.01) [B01J 23/08 (2013.01); B01J 23/92 (2013.01); C07C 5/48 (2013.01); C07C 2523/08 (2013.01)] | 4 Claims |
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1. A process for regenerating a catalyst comprising noble metal and gallium comprising:
feeding a stream of coked catalyst from a reactor to a regenerator vessel;
feeding a stream of oxygen supply gas to said regenerator vessel;
feeding a stream of fuel gas to said regenerator vessel;
combusting coke from said coked catalyst and combusting said fuel gas with said oxygen supply gas to provide a regenerated catalyst and flue gas;
separating said regenerated catalyst from said flue gas and transporting a return portion of the regenerated catalyst back to the reactor;
stripping entrained oxygen on said regenerated catalyst before the regenerated catalyst is returned to the reactor by contacting said regenerated catalyst with an inert stripping gas during periods of startup or shutdown when temperature in said reactor is below 240° C.; and
purging said inert stripping gas from said regenerated catalyst when temperature in said reactor is above 240° C.; wherein at least about 97 wt. % of said entrained oxygen is stripped from said regenerated catalyst by contacting said regenerated catalyst with said inert stripping gas; and
wherein said inert stripping gas is completely purged from said regenerated catalyst after temperature in said reactor is maintained above about 400° C.
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