New method describes FCC catalyst selection for diffusion limited units

Recent advances in FCC short contact time operations coupled with heavier feedstocks have resulted in more catalytic crackers operating in a mass transfer limited regime. The rate of mass transfer-not catalytic activity-determines the reaction rate in these units.These operations do not typically respond to independent variable manipulation for improved conversion and selectivity. For example, in many of these operations, bottoms conversion shows little response to increased riser outlet temperature or increased catalyst activity but often shows a large response to improved catalyst accessibility.1Units operating with diffusion limitations will not respond to a classic catalyst selection ...

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