ChE-403ChE-403

ReactionReaction < CSTR >< CSTR >

Mohammad Faraj

Prof.:Malik Al-Ahmad

What we will talk about ?What we will talk about ?o What Is CSTR?What Is CSTR?o The Experiment That Was Done:The Experiment That Was Done:

Theory.Theory. Experimental Procedure.Experimental Procedure. Results and Discussions.Results and Discussions. Conclusions and Recommendations.Conclusions and Recommendations.

IntroductionIntroduction

o CSTR ( Continuous Stirred Tank )CSTR ( Continuous Stirred Tank ) is a is a type of reactor used commonly in industrial type of reactor used commonly in industrial processing.processing.

o It is Used Primarily For:It is Used Primarily For: Liquid phase reactionsLiquid phase reactions.. Steady state operationSteady state operation.. Perfectly mixed operation.Perfectly mixed operation.

What is CSTR?What is CSTR?

What is CSTR?What is CSTR?

Advantages:Advantages: Good temp. control is easily maintained.Good temp. control is easily maintained. Cheap to construct.Cheap to construct.

Disadvantages:Disadvantages: Conversion of reactor to product per volume Conversion of reactor to product per volume

of reactor is small compared to other flow of reactor is small compared to other flow reactors.reactors.

What is CSTR?What is CSTR?

The General Material Balance:The General Material Balance:

Theory of The Experiment Theory of The Experiment

dt

dNdVrFF A

AAA 01

For CSTR:For CSTR:

Theory of The Experiment Theory of The Experiment

VCkCC

CF

CF

VrFF

AAA

AA

AA

AA

..)(

.

.

0.

00

000

0

To Convert The Conductivity To To Convert The Conductivity To Concentration:Concentration:

Theory of The Experiment Theory of The Experiment

ACTA *))294(*0184.01(195.0

The reactor that used in this The reactor that used in this experiment was CSTR with experiment was CSTR with

T = 22C. and the following reaction T = 22C. and the following reaction was done:was done:

The objectives of the experiment to The objectives of the experiment to know the reaction constant in CSTR.know the reaction constant in CSTR.

Experimental ProcedureExperimental Procedure

AlcoholEthylAcetateSodiumAcetateEthylHydroxideSodium

OHHCCOONaCHHCOOCCHNaOH

523523

Experimental ProcedureExperimental Procedure

Results and DiscussionsResults and Discussions

The concentrations of A at Steady The concentrations of A at Steady State:State:

Results and DiscussionsResults and Discussions

CONCENTRATION OF A

(mol/ml)

@ Feed

CONCENTRATION OF A

(mol/ml)

@ CSTR

50 24.67

α = 5α = 5 (Batch Case).(Batch Case). k = 1.2417X10-6 [ml^4/(s.mol^4)] k = 1.2417X10-6 [ml^4/(s.mol^4)] (Batch (Batch

Case).Case). CA = CAo ( 1 – X ) => CA = CAo ( 1 – X ) => X = 0.5145X = 0.5145 ν ν = 1 ml/s= 1 ml/s

Results and DiscussionsResults and Discussions

4

49

5 .10788.1

.

..

mols

ml

CV

XCk

A

Ao

The value of k is varying in the two cases, The value of k is varying in the two cases, may be because of the steady state in two may be because of the steady state in two cases not reached.cases not reached.

The CSTR experiment not needed for The CSTR experiment not needed for finding the variables in this experiment finding the variables in this experiment (batch reactor is enough).(batch reactor is enough).

The Recording of results must taken by The Recording of results must taken by using computer to get accurate results.using computer to get accurate results.

Conclusions and RecommendationsConclusions and Recommendations

H.Scott Fogler, "Element of Chemical H.Scott Fogler, "Element of Chemical Reaction Engineering", 4th ed. United Reaction Engineering", 4th ed. United States of America: Pearson, 1993.States of America: Pearson, 1993.

Abo Kalaf A., "Chemical Engineering Abo Kalaf A., "Chemical Engineering Laboratory ".Laboratory ".

ReferencesReferences

Thank YouThank YouAny Questions? Any Questions?