Page 267 - Modeling of Chemical Kinetics and Reactor Design

Industrial and Laboratory Reactors 237

Figure 4-11. Deep catalytic cracking process flow diagram. (Courtesy of Stone
& Webster Engineering Corporation, © 1977 Stone & Webster Engineer-
ing Corporation.)

Table 4-1
Operating parameters
Deep Fluidized
Catalytic Catalytic Steam
Cracking Cracking Cracking
Item (DCC) (FCC) (SC)
Typical Residence Time (sec) 10–60 1–30 0.1–0.2
Catalyst/Oil 9–15 5–10
Steam, wt% of feed 10–30 1–10 30–80
Reactor Temperature, °F 950–1,070 950–1,020 1,400–1,600
Pressure, psig 10–20 15–30 15

the bulk fluid and the catalyst surface. The developing rate expression
is used to account for the intrinsic kinetics at the catalyst surface and
the mass transfer process. The coupling of the intrinsic kinetics and
mass transfer is due to the heterogeneous nature of the system.
In contrast to reactors involving the use of solid catalyst phases,
there are reactors that use two liquid phases. An example is the