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“Chemical Engineering Equilibrium Separations” Lectures 12 & 13

“Chemical Engineering Equilibrium Separations” Lectures 12 & 13. 12 Oct 2012. Overview. AspenPlus : Shortcut methods: DSTWU Rigorous method: RADFRAC Efficiencies Introduction to multicomponent distillation. AspenPlus : DSTWU. Tray Operation. Spray Froth * Emulsion Bubble

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“Chemical Engineering Equilibrium Separations” Lectures 12 & 13

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

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

  3. AspenPlus: DSTWU

  4. Tray Operation Spray Froth * Emulsion Bubble Cellular foam

  5. Types of Trays Sieve Valve Bubble cap

  6. Typical Flow Pattern

  7. Operation Typically columns operated at 50% - 85% of flooding. 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).] Seader et.al., 2012

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

  9. Operation Typically columns operated at 50% - 85% of flooding. 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).] Seader et.al., 2012

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

  11. Efficiencies Overall column efficiency: Murphree efficiency:

  12. Efficiencies

  13. Efficiencies Seader & Henley, 2006

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

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

  16. Questions?

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