Table 14
The effect of increasing operating variables
Operating variables increased
Yields
Combined
feed temp.
Rx temp. Feed rate
Catalyst
activity
Rx press.
Carbon on
catalyst
Combined
feed ratio
Contact time
in Rx
Coke
select. cat
Conv.
Down
Up
Down
Up
Up
Down
Up
Up
Up
Dry gas
Down slightly
Up
Down
Same
Up
slightly
Down
Up
Up
Down
LPG
Down
Up
Down
Up
Up
Down
Up
Up
Up
Gasoline
Down
Up
slightly
Down
slightly
Up
Up
slightly
Down
Up
Up
Up
LCO
Up
Down
Up
Down
Down
Up
Down
Down
Down
Coke
Down
Up
Down
slightly
Same
Same
Down
Up
Same
Same
RON
Up slightly
Up
Nc
Down
Down
Up
Up
Down
Up
MON
Nc
Up
Nc
Down
Down
slightly
Up
Up
Down
Up
Regen. temp. Up
Up
Slightly
Nc
Up
Up
Down
Up
Up
Down
Catalyst/oil
Down
Up
Nc
Down
Down
Up
Up
Down
Up
Delta coke
Up
Down
Down
slightly
Up
Up
Down
Up
Up
Down
Fluid Catalytic Cracking (FCC) in Petroleum Refining
293