A.FLUID CATALYTIC CRACKING/a.PROCESS(Contd.)
Q2.For FCC
units with a closed riser termination device(RTD)/cyclone systems,do you
operate with the primary separator sealed or unsealed in the stripper bed? What
differences in performance do you see between these modes?Which do you prefer?
The choice between sealed
and unsealed operation is often dictated by the hardware design,sincesome units
can only operate in one mode.For those that can operate either way,the choice
is usually dictated by either dry gas make or catalyst losses.One unit starts
up unsealed and switches to sealed mode when the unit operation stabilizes.
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