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“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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Presentation Transcript

Overview

  • AspenPlus:

    • Shortcut methods: DSTWU

    • Rigorous method: RADFRAC

  • Efficiencies

  • Introduction to multicomponent distillation


AspenPlus: DSTWU


Tray Operation

Spray

Froth *

Emulsion

Bubble

Cellular foam


Types of Trays

Sieve

Valve

Bubble cap



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


Operation

Video:

FRI (Fractionation Research, Inc.) non-profit research consortium

“Design and Performance of Fractionating Devices”

http://www.fri.org/


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


Efficiencies

Assumed equilibrium stages, but may not reach equilibrium on a stage; why?

Flooding!


Efficiencies

Overall column efficiency:

Murphree efficiency:



Efficiencies

Seader & Henley, 2006


Efficiencies

P.C. Wankat, 2nd., 2007


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)



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