FLUID CATALYTIC CRACKING (FCC)

The figure provided here illustrates a block diagram for a fluid catalytic cracking system.

The most common process (among catalytic cracking systems) is FCC. In this process oil is cracked in presence of a finely divided catalyst which is maintained in an aerated or fluidized state by the oil vapors.

The fluid cracker consists of a catalyst section and a fractionating section that operate together as an integrated processing unit. The catalyst section contains the reactor and the regenerator, which, with the standpipe and riser, forms the catalyst circulation unit. The fluid catalyst is continuously circulated between the reactor and the regenerator using air, oil vapors, and steam as the conveying media.