1. “Chemical Engineering Equilibrium Separations” Lectures 12 & 13 1 12 Oct 2012

2. Overview 2 AspenPlus: o Shortcut methods: DSTWU o Rigorous method: RADFRAC Efficiencies Introduction to multicomponent distillation

3. AspenPlus: DSTWU 3

4. Tray Operation 4 a)Spray b)Froth * c)Emulsion d)Bubble e)Cellular foam

5. Types of Trays 5 a)Sieve b)Valve c)Bubble cap

6. Typical Flow Pattern 6

7. Operation 7 Typically columns operated at 50% - 85% of flooding. Seader et.al., 2012 Figure 6.21 Limits of stable operation in a trayed tower. [Reproduced by permission from H.Z. Kister, Distillation Design, McGraw-Hill, New York (1992).]

8. Operation 8 Video: FRI (Fractionation Research, Inc.) non-profit research consortium “Design and Performance of Fractionating Devices” http://www.fri.org/

9. Operation 9 Typically columns operated at 50% - 85% of flooding. Seader et.al., 2012 Figure 6.21 Limits of stable operation in a trayed tower. [Reproduced by permission from H.Z. Kister, Distillation Design, McGraw-Hill, New York (1992).]

10. Efficiencies 10 Assumed equilibrium stages, but may not reach equilibrium on a stage; why? Flooding!

11. Efficiencies 11 Overall column efficiency: Murphree efficiency:

12. Efficiencies 12

13. Efficiencies 13 Seader & Henley, 2006

14. Efficiencies 14 P.C. Wankat, 2 nd., 2007

15. Overview 15 Questions on homework?? McCabe-Thiele graphical technique (binary systems) Condensers Reboilers Binary Shortcut Methods AspenPlus: o Shortcut methods: DSTWU o Rigorous method: RADFRAC Efficiencies Introduction to multicomponent distillation (chapter 9)

16. Questions? 16