Separating Azeotropic Mixtures

1. Separating Azeotropic Mixtures CHEN 4460 – Process Synthesis, Simulation and Optimization Dr. Mario Richard EdenDepartment of Chemical EngineeringAuburn University Lecture No. 7 – Sequencing Separation of Azeotropic Mixtures October 2, 2012 Contains Material Developed by Dr. Daniel R. Lewin, Technion, Israel

2. 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

3. Product Compositions Regions • For azeotropic systems • Shaded regions: Feasible distillate and bottoms product compositions • Three binary azeotropes and one ternary azeotrope • Two binary azeotropes

4. Heterogeneous Azeotropic Dist. • Example: Dehydration of Ethanol Try toluene as an entrainer

5. D1 M2 M1 S1 S2 Heterogeneous Azeotropic Dist. • Example: Dehydration of Ethanol D2

6. Pressure Swing Distillation

7. T-x-y diagrams for THF and water Pressure Swing Distillation • Example: Dehydration of Tetrahydrofuran (THF)

8. 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

9. Other Business • Midterm Exam • October 9 during lecture • Good Luck! • Next Lecture – October 16 • Mathematical Optimization (SSLW p. 642-661)