Page 215 - Elements of Chemical Reaction Engineering 3rd Edition

Sec. 4.7 Unsteady-State Operatlon of Reactors 187
programs, and Figure E4-10.2 shows the results of the numerical solut~on of
the initial (entering) conditions.

A=O FA=FAo F,=O Fc=O

TABLE E4-10.1. POLYMATH PROGRAM
-
Equal iotis Initial Values
-
d(Fb)/d(V)=-ra-kc*Cto*(?b/Ft) 0
IdiFa) /d(V) =ra 13
d(Fc) /d(V)=-ra 0
ICC=.O 2
Cto=0. 2
I’t=?a+Fb+Fc
k=O. 7
Kc=O. 05
ra=-k*CtO*((Fa/Ft)-Cto/KC*(Fb/?t)*(FC/Ft))
TIo = 0, Vf = 503

__
KEY:
-Fa
-Fb
-Fc
6. on0

4.000

2. on0

0.000 100.000 200.000 :300.000 400.000 500.00
U
Figure E4-10.2 POLYMATH solution.

4.7 Unsteady-State Operation of Reactors
In this chapter we have already discussed the unsteady Operation of one type
of reactor, the batch reactor. In this section we discuss two other aspects of
unsteady operation. First, the startup of a CSTR is examined to determine the