CONVERSION AND REACTOR SIZING

One can approximate a PFR by a large # of CSTRs in series:
F A0
1 2 3 4
PFRs in Series
X 2
-r A1
F A1
X 1 =0.4
X1
X 2
∫ ∫ ∫ −
⋅ +
FA0
⋅ = FA0
⋅ FA0
− r − r
0
dX
A
0
-r A2
dX
F A2
X 1 = 0.8
A
dX
r
X1 A
Reactors in Series: CSTR – PFR – CSTR
-F A0/r A
V
PFR
=
n
∑
i=
1
V
CSTR , i
V TOTAL = V PFR,1 + V PFR,2
The overall conversion of
two PFRs in series is the
same as one PFR with the
same total volume
Using the data in the table, calculate the reactor volumes V 1, V 2 and V 3
for the CSTR/PFR/CSTR reactors in series sequence along with the
corresponding conversion.
X
16