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Green Chemical Engineering
book

Green Chemical Engineering

by S. Suresh, S. Sundaramoorthy
December 2014
Intermediate to advanced content levelIntermediate to advanced
541 pages
17h 38m
English
CRC Press
Content preview from Green Chemical Engineering
165Homogeneous Reactors
that is, 0
2
=−
qC Vk C
Cf Bf
CkC
Cf Bf
=
2
τ
(3.72)
Overall selectivity of B (desired product) Φ
B
is
Φ
B
Bf
Cf
C
Ck
=
=
1
2
τ
(3.73)
As space time τ increases, selectivity
Φ
B
decreases and conversion of A
xC
C
Af Af AO
=−
1(
)
/
increases
x
k
k
Af
=
+
1
1
1
τ
τ
(3.74)
Combining Equations 3.73 and 3.74, we can write overall selectivity
Φ
B
in terms of total
conversion x
Af
as
Φ
B
Af
Af
k
k
x
x
=
1
2
1
(3.75)
Thus, selectivity
Φ
decreases with an increase in conversion x
Af
.
For the series reaction
ABC
kk
12
→→
carried out in a PFR, the equation for overall
selectivity derived for the batch reactor (Section 2.1.8) can be used for PFR after replacing
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Publisher Resources

ISBN: 9781466558830