ChE-403
Reaction < CSTR >
Mohammad Faraj
Prof.:Malik Al-Ahmad
Introduction
What we will talk about ?
o What Is CSTR?
o The Experiment That Was Done:




Theory.
Experimental Procedure.
Results and Discussions.
Conclusions and Recommendations.
What is CSTR?
o CSTR ( Continuous Stirred Tank ) is a
type of reactor used commonly in industrial
processing.
o It is Used Primarily For:
 Liquid phase reactions.
 Steady state operation.
 Perfectly mixed operation.
What is CSTR?
What is CSTR?
Advantages:
 Good temp. control is easily maintained.
 Cheap to construct.
Disadvantages:
 Conversion of reactor to product per volume
of reactor is small compared to other flow
reactors.
Theory of The Experiment
 The General Material Balance:
dN A
FA1  FA0   rA dV 
dt
Theory of The Experiment
 For CSTR:
FA0  FA  r.V  0
FA0   0 .C A0
FA   .C A

 0 (C A0  C A )  k .C A .V
Theory of The Experiment
 To Convert The Conductivity To
Concentration:
A  0.195(1  0.0184 * (T  294)) * CA
Experimental Procedure
 The reactor that used in this
experiment was CSTR with
T = 22C. and the following
reaction was done:
NaOH
 CH 3COOC 2 H 5          CH 3COONa  C2 H 5OH
Sodium Hydroxide  Ethyl Acetate      Sodium Acetate  Ethyl Alcohol
 The objectives of the experiment to
know the reaction constant in CSTR.
Experimental Procedure
Results and Discussions
Results and Discussions
 The concentrations of A at Steady
State:
CONCENTRATION OF A
(mol/ml)
@ Feed
CONCENTRATION OF A
(mol/ml)
@ CSTR
50
24.67
Results and Discussions
 α = 5 (Batch Case).
 k = 1.2417X10-6 [ml^4/(s.mol^4)] (Batch
Case).
 CA = CAo ( 1 – X ) => X = 0.5145
 ν = 1 ml/s
C Ao . . X
ml
9
k 
 1.788  10
5
4
s
.
mol
V .C A
4
Conclusions and Recommendations
 The value of k is varying in the two
cases, may be because of the steady state
in two cases not reached.
 The CSTR experiment not needed for
finding the variables in this experiment
(batch reactor is enough).
 The Recording of results must taken by
using computer to get accurate results.
References
 H.Scott Fogler, "Element of Chemical
Reaction Engineering", 4th ed. United
States of America: Pearson, 1993.
 Abo Kalaf A., "Chemical Engineering
Laboratory ".
Thank You
Any Questions?