Separating Azeotropic Mixtures

CHEN 4460 – Process Synthesis, Simulation and Optimization

Dr. Mario Richard EdenDepartment 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

S1

S2

M1

D2

M2

D1

Pressure Swing Distillation

Pressure Swing Distillation

• Example: Dehydration of Tetrahydrofuran (THF)

T-x-y diagrams for THF and water

Summary – Azeotropic Sep.

Be able to define the PFD for a heterogeneous azeotropic distillation system

Be able to define the PFD for a pressure swing distillation system

On completion of this part, you should:

Other Business

• Midterm Exam– October 9 during lecture– Good Luck!

• Next Lecture – October 16– Mathematical Optimization (SSLW p. 642-661)