lecture 10 tuesday 2/5/08 definition of selectivety instantaneous s d / u = r d /r u overall = f d...
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Lecture 10 Tuesday 2/5/08
Definition of Selectivety
Instantaneous SD/U = rD/rU
Overall = FD/FU
Semibatch Reactors
Read Problem P4-23 on page 246 before Lecture begins
Semibatch and Rate Law Intro
Semibatch reactors
example: A + B → C + D
A
B, v0
Initial V
tvVVvdt
dV
dt
dVV
Vmvmtvdt
dm
0000
00
1) Mole balances: A: in – out + gen = acc
0 - 0 + rAV = dNA/dt
B: FB – 0 + rBV = dNB/dt
dt
dVC
dt
dCV
dt
VCd
dt
dNA
AAA ][
tvVVV
Cvr
dt
dCV
Cvr
dt
dCV
CCvr
dt
dCV
Cvr
dt
dC
DD
D
CC
C
BBB
B
AA
A
00
0
0
00
0
5
4
3
)( 2
1
2) Rate Law:
3) Stoich:
4) Parameters:
VCN
VCN
N
NNX
rr
rr
rr
rrrr
CkCr
AA
AA
A
AA
AD
AC
AB
DCBA
BAA
12
11
10
9
8
71111
6
000
0
0
0000 , , , , BA CkvVC
example: A + B → C + D + CO2
1) Mole balances:
mass balances:
2) Rate law:
A
B, v0 CO2
MWVrv
dt
dV
dt
dVMWFv
MWFmvmVmdt
dmmm
FVr
Vrdt
dN
Vrdt
dN
FVrdt
dN
Vrdt
dN
CO
CO
CO
i
COCO
DD
CC
BBB
AA
2
2
2
22
0
0
00
0
0
6
0 5
4
3
2
1
BAA CkCr
3) Stoich:
4) Parameters:
0
0
CO
B
A
13
12
11
01
9
C 8
7
2
A
AA
A
AD
AC
A
BB
A
N
NNX
rr
rr
rr
rrV
NV
NC
, , , , , , ,0
000000 kMWC
FvFCCV
B
BBBA
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