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I would like to know the proper actions to be done when there is a loss of PCE injection in the catalyst regenerator of UOP CycleMax CCR Unit. If for instance, the loss of PCE injection (both injection in feed and in catalyst regenerator) would not be addressed immediately and PCE injection would not be available for an 8-hour duration or more, to avoid platinum agglomeration or other cases, will it be better to run the unit in hot shutdown/cold shutdown, or can the catalyst endure the loss of PCE injection, and be able to normalize once injection is resumed upon availability.

 
Answers
04/11/2016 A: Mohan Shyam Pathak, UOP A Honeywell Company, mohanspathak@gmail.com
Stop the catalyst circulation and maintain the regenerator in hot condition if you aim to bring back PCE injection online the same day.
12/05/2015 A: Farid Q Q, Indian oil corporation Ltd, faridulqadar@gmail.com
CCR catalyst is robust enough that it can handle loss of PCE but to get desired metal and acidic function of the catalyst it is of utmost importance that PCE injection is restored as early as possible (you will experience substantial octane loss due to PCE failure). It has been proved experimentally and seen practically as well that once PCE injection is restored the agglomeration of Pt can be addressed and Pt can again be re-dispersed on the catalyst surface (although you will require slightly high dosing of PCE initially post PCE injection resumption).