Download Chapter 3, Part 2

Chemical Reaction Engineering
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Chapter 3, Part 2:
Reaction Stoichiometry: Batch
H. Scott Fogler, Ph.D.
Why Stoichiometry?
•
If we have
FA 0
 rA
X
•
Then we can size a number of CSTR and PFR reaction systems
•
To find -rA= f(X)
1) Need the rate law, -rA=f(CA, CB)
2) Need the reaction stoichiometry, CA=CA0(1-X) [Liquid Phase]
!!
Batch Stoichiometric Table
Species Symbol
A
Initial
Change
Remaining
A
________
____________
Batch Stoichiometric Table
Species Symbol
A
A
B
B
Initial
B 
Change
Remaining
N B0
N A0
________
____________
Batch Stoichiometric Table
Species Symbol
A
A
B
B
C
C
Initial
B 
Change
Remaining
N B0
N A0
________
____________
Batch Stoichiometric Table
Species Symbol
A
A
B
B
C
C
D
D
Initial
B 
Change
Remaining
N B0
N A0
________
____________
Batch Stoichiometric Table
Species Symbol
A
A
B
B
C
C
D
D
Inert
I
Initial
B 
Change
Remaining
N B0
N A0
------________
____________
Batch Stoichiometric Table
Species Symbol
A
A
B
B
C
C
D
D
Inert
I
Initial
B 
Change
Remaining
N B0
N A0
------________
____________
Batch Stoichiometric Table
Species Symbol
A
A
B
B
C
C
D
D
Inert
I
Initial
B 
Change
N B0
N A0
------____________
________
where
Remaining
and
Concentration: Batch Systems
Constant Volume Batch:
Concentration: Batch Systems
Constant Volume Batch:
Note:
if the reaction occurs in the liquid phase
or
if a gas phase reaction occurs in a rigid (e.g., steel) batch reactor
Then
Concentration: Batch Systems
Constant Volume Batch:
Note:
if the reaction occurs in the liquid phase
or
if a gas phase reaction occurs in a rigid (e.g., steel) batch reactor
Then
etc.
Concentration: Batch Systems
Constant Volume Batch:
Note:
if the reaction occurs in the liquid phase
or
if a gas phase reaction occurs in a rigid (e.g., steel) batch reactor
Then
etc.
If
And we have –rA=f(X)
then