Solid catalyst is very finely powdered (fluidized) so that it behaves almost like a fluid and can be circulated in the gas stream.
Vapours of heavy and fluidized catalyst are forced into the reactor where cracking occurs.
Top of the reactor has a cyclone which does not allow the catalyst to pass on to the fractionating column.
The spent catalyst is then sent into catalyst regenerator along with a stream of air where carbon coating over the catalyst burns off and the catalyst is regenerated.
Cracked vapours are sent to the fractionating column where untracked heavy oil condenses and the uncondensed light fraction is sent to the cooler.
In the coolers the most of the lighter fraction condense gasoline along with the dissolved gases is sent to tanks and uncondensed gases move on.
Gasoline containing dissolved gases is then sent through stabilizer where dissolved gases are removed and pure gasoline is obtained.
