Separating Azeotropic Mixtures
CHEN 4460 – Process Synthesis,
Simulation and Optimization
Dr. Mario Richard Eden
Department of Chemical Engineering
Auburn University
Lecture No. 7 – Sequencing Separation of Azeotropic Mixtures
October 2, 2012
Contains Material Developed by Dr. Daniel R. Lewin, Technion, Israel
Lecture 7 – Objectives
 Be able to define the PFD for a heterogeneous
azeotropic distillation system
 Be able to define the PFD for a pressure swing
distillation system
Product Compositions Regions
•
For azeotropic systems
–
Shaded regions: Feasible distillate and bottoms product
compositions
Two binary azeotropes
Three binary azeotropes
and one ternary azeotrope
Heterogeneous Azeotropic Dist.
•
Example: Dehydration of Ethanol
Try toluene
as an
entrainer
Heterogeneous Azeotropic Dist.
•
Example: Dehydration of Ethanol
D1
M2
M1
S1
S2
D2
Pressure Swing Distillation
Pressure Swing Distillation
•
Example: Dehydration of Tetrahydrofuran (THF)
T-x-y diagrams for THF and water
Summary – Azeotropic Sep.
On completion of this part, you should:
 Be able to define the PFD for a heterogeneous
azeotropic distillation system
 Be able to define the PFD for a pressure swing
distillation system
Other Business
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Midterm Exam
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–
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October 9 during lecture
Good Luck!
Next Lecture – October 16
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Mathematical Optimization (SSLW p. 642-661)