FCC severity control

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Comments:
: Does anyone have experience of implementing severity control in MBPC of FCC plants?
: This means to use a severity model and use it instead of just maximizing riser temperature against constraints. Could you come up with arguments for a severity model?
: Severity maximization against constraints is dynamically more accurate than riser temp. maximization?
: FCC MBPC with severity model is stable and robust?
: What about the cases where frequent FCC feed quality swings occur?
: Thanks in advance 
: John Alef


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