Page 24 - Fluid Catalytic Cracking Handbook
P. 24
8 Fluid Catalytic Cracking Handbook
To Reactor or Cyclone
Catalyst
From
Regenerator
(Typical for
Multiple Nozzles)
Figure 1-6. Typical riser "Y".
The catalytic reactions occur in the vapor phase. Cracking reactions
begin as soon as the feed is vaporized. The expanding volume of the
vapors that are generated are the main driving force to carry the
catalyst up the riser.
Catalyst and products are quickly separated in the reactor. However,
some thermal and non-selective catalytic reactions continue. A number
