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Understanding Distillation Techniques: AspenPlus and Multi-component Processes

This lecture series focuses on key concepts of chemical engineering separation processes, particularly distillation. It covers both shortcut methods like DSTWU and the rigorous RADFRAC method in AspenPlus. Learn about efficiencies in distillation, the types of trays used (such as sieve and valve trays), and operational patterns in trayed columns. It also addresses equilibrium stages, questions on homework, and methods like the McCabe-Thiele technique for binary systems—delving into the design and performance of fractionating devices.

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Understanding Distillation Techniques: AspenPlus and Multi-component Processes

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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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