Biomedical Engineering Reference
In-Depth Information
5.51. A gaseous mixture of A and B at
T
0
¼
400 K,
P
0
¼
4 atm,
C
A0
¼
100 mol/L and
C
B0
¼
200 mol/L is fed to a flow reactor where the reaction
A
þ
B
/ 2
R
takes place. In the effluent stream,
T
e
¼
300 K,
P
e
¼
3 atm and
C
Ae
¼
20 mol/L.
Find
f
Ae
,
f
Be
, and
C
Be
.
5.52. We wish to convert A to R in a CSTR by the aqueous decomposition reaction:
A
r
1
¼ k
1
C
2
A
/
R
þ
U
0.9 m
3
/(mol
$
min). We realized that A can also turn to S through another
Where
k
1
¼
reaction:
A
þ
A
/
S
r
2
¼ k
2
C
A
1.2 min
1
. The aqueous feed contains A by
C
A0
¼
40 mol/m
3
. Find the
With
k
2
¼
optimum operating conditions (
f
A
,
, and concentrations) if the cost of separation
s
and recycle of the reactant is too high.
5.53. A fast aqueous reaction network:
R
D
r
2
r
6
k
5
C
2
r
6
= 2
r
5
=
r
1
r
1
=
k
C
r
5
1
A
k
1
C
D
r
2
=
½
k
C
r
7
r
3
1
R
B can further react
to form S and T:
B
T
A
r
7
= 80
k
C
C
T
B
r
3
=½
k
C
5
B
1
A
r
8
k
5
C
2
r
8
= 80
r
4
r
4
=
k
C
1
A
S
C
The feed contains 20 mol/L A and there are no other active reactants in the feed. In
a batch experiment, when A is properly mixed with catalyst, the conversion of A is
found to be 99.9% in 1 s. However, the concentration of B varies with time slowly after.
(a) If the desired product is S, what type and size (small, intermediate, or large) of flow
reactor would you choose?
(b) What type and size (small, intermediate, or large) of flow reactor would you choose
if the desired product is T instead?
(c) What are the final concentrations (A, B, C, D, and R) after the batch reactor was left
alone for a long-time together with its contents? Roughly estimate the final
concentrations of S and T.
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