Page 571 - Elements of Chemical Reaction Engineering Ebook
P. 571
Sec. 9.2 Unsteady Operation of CSTRs and Ssmibatch Heactors 541
-
630 -
610 -
c
-
-
(“R) -
T
580
1 1 1 1 1 1 1 1
t (seconds)
Figure E9-1.1 Temperature-time curve.
1 .o
0.8
0.6
X
0.4
0.2
0.0
t (sec0nds)
Figure E9-1.2 Conversion-time curve.
It is of interest to compare this residence time with the residence time in
the 175-gal CSTR to attain the same conversion:
This occasion is one when the increase in the reaction rate constant caused by
the increase in temperature more than compensates for the decrease in rate
caused by the decrease in concentration, so the residence time in the CSTR for
this coilversion is less than it would be in a batch or tubular plug-flow reactor.
