Model Development for Industrial FCC Units

Many models for fluid catalytic cracking have been studied. We introduce a model that seems to have an optimal degree of sophistication and that succeeds to describe many industrial units accurately. 

The most simple version of our model considers the two-phase nature of the fluidized beds in the reactor and in the regenerator in a simplified way. The kinetic model that we use considers three pseudocomponents in modeling type IV FCC units. This model is a consecutive-parallel model formed of three lumped components and coke as follows  

The rates of reactions, measured in g(converted)/(g(catalyst) s) for the consecutive-parallel network model are as follows  

For the coke that burns in the regenerator, the continuous reaction model for solids of unchanging size is used because of its simplicity. 

In our simple coke burning model, the gaseous reactant (oxygen) is assumed to be present uniformly throughout the catalyst particle at a constant concentration without diffusional resistance. The oxygen reacts with the solid reactant B, consisting of coke deposited on the catalyst according to the rate equation 

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