Lecture 10
1
Block 1: Mole Balances
Block 2: Rate Laws
Block 3: Stoichiometry
Block 4: Combine
Definition of Selectivity
Semibatch Reactors
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Selectivity - Chemical Reaction Engineering - Lecture Slides, Slides of Engineering Chemistry
Chemical Reaction Engineering covers Heat Effects, Isothermal Design, Stoichiometry, Rate Laws, Mole Balance and many other topics. This lecture includes: Selectivity, Semibatch Reactors, Stoichiometry, Rate Laws, Mole Balances, Mass Balance, Mole Balance, Equilibrium Conversion, Polymath Equations
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2012/2013
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Lecture 10
Block 1:
Mole Balances
Block 2:
Rate Laws
Block 3:
Stoichiometry
Block 4:
Combine
Definition of Selectivity
Semibatch Reactors
Selectivity in Multiple Reactions
(Desired)(Undesired
2
2
B
A
U
U
k
B
A
D
D
k
C C k r U B A C C k r D B A
D U
Selectivity
Yield
Instantaneous
S
D/U
= r
D
/r
U
Overall
Ŝ
D/U
= F
D
/F
U^ B
U
A
D
B
A
u
B
A
D
D U
U
D
C
k
C
k
C
C
k
C
C
k
r r
S
2
2
/
)
/(
ˆ
0
A
A
D
D
F
F
F
Y
A
D
D
r
r
Y
/
Keep
C
A
high and
C
B
low.
Semibatch reactors
A + B
→
C + D
A
B, v
0
Initial V
m
Liquid level and volume increase
Semibatch Reactors
1) Mass Balance:
m
dt dm
and
m
0
0
0
V
m
0
0
0
dt dV
dt dm
0
dt dV
0
V
V
t
t
V
V
0
0
Semibatch Reactors
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1) Mole Balance
on Species B:
Semibatch Reactors
V
C
C
r
dt
dC
B
B
B
B
0
0
0
0
0
B
B
C
F
dt
dN
V
r
F
B
B
B
0
[
]
B
B
B
B
dN
d C V
dC
dV
V
C
dt
dt
dt
dt
0
dt
dV
t
V
V
V
C
r
dt
dC
V
C
r
dt
dC
V
C
C
r
dt
dC
V
C
r
dt
dC
D
D
D
C
C
C
B
B
B
B
A
A
A
0
0
0 0
0
0 0
3 4 5
)
(
1 2
Semibatch Reactors^ 1) Mass and Mole Balance
Summary
Semibatch Reactors
Semibatch Reactors
Equilibrium Conversion in SemibatchReactors with Reversible ReactionsWhere:
V
X
N
t
F
C
A
B
B
0
0
V
X
N
C
C
A
D
C
0
V
X
N
C
A
A
1
0
At equilibrium,
then
0
r
A
e
A
B
e
e
A
Be
Ae
De
Ce
Be
Ae
De
Ce
C
X
N
t
F
X
X
N
N
N
N
N
C
C
C
C
K
0
0
2
0
1
X
e
changes with time.
P6-
B
- Semibatch Reactors
Sodium Bicarbonate + Ethylene Chlorohydrin
Ethylene Glycol + NaCl + CO
2
NaCHO
3
- CH
2
OHCH
2
Cl
(CH
2
OH)
2
- NaCl + CO
2
A + B
C + D + CO
2
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0
0
0
0
0
2
0
2
2
2
a
a
a
a
a
B
A
A
B
B
A
a
CO
CO
CO
C
V
N
N
N
N
X
C
kC
r
V
N
C
V
N
MWRHOC
RHO
MWCO
F
dt dV
Rest of the Polymath StatementsSimilar to Concentration Program
Rate Laws
P6-6 Semibatch: Moles, N
a
, N
b
, etc.