Page 82 - Elements of Chemical Reaction Engineering 3rd Edition
P. 82
54 Conversion and Reactor Sizing Chap. 2
Example 2-7 Comparing the Order of Sequencing Reactors
Calculate the individual reactor volume as well as the total reactor volume for each
scheme in Figure 2-6 for the reaction data given in Table 2-2 when the intermediate
conversion is 50% and FAo = 0.867 mol/s.
Solution
We again use Figure 2- I to arrive at Figure E2-7.1 and evaluate the design integrals.
Scheme A
dX -
-
Plug flow: FAO 8 -rA
Integrating between X = 0 and X = 0.5 yields
4 1
-
-
0.25
=&a- [189+4X211+303]
3
= (O.867)( 11 1)
= 97 dm3 (liters)
x, - XI
CSTR: V, = FAo - 0.867(0.8 - 0.5)(800) = 208 dm3
=
-
V,,, = V, + V, = 305 dm3
Scheme A Scheme B
1000
800
-
ill
600
€E
W
-1 ,Q 400
I
200
0
0
Conversion, X Conversion, X
Figure E2-7.1
