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Overview of Distillation Techniques and AspenPlus for Multicomponent Systems

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This lecture series on unit operations explores distillation processes using AspenPlus software. It covers shortcut methods like DSTWU and rigorous methods such as RADFRAC, focusing on efficiencies in multicomponent distillation. Key topics include tray operation, types of trays (sieve, valve, bubble cap), and operation stability in trayed towers. Emphasis is placed on the role of equilibrium stages and overall column efficiency, referencing McCabe-Thiele techniques, condensers, and reboilers. Students are encouraged to engage with the material and ask questions.

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Overview of Distillation Techniques and AspenPlus for Multicomponent Systems

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Presentation Transcript

  1. Unit Operations 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. 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

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

  8. 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

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

  10. Efficiencies Overall column efficiency: Murphree efficiency:

  11. Efficiencies

  12. Efficiencies Seader & Henley, 2006

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

  14. 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 (read Ch 5 & 7 in Wankat)

  15. Questions?

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