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“Chemical Engineering Equilibrium Separations” Lectures 12 & 13

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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
slide2

Overview

  • AspenPlus:
    • Shortcut methods: DSTWU
    • Rigorous method: RADFRAC
  • Efficiencies
  • Introduction to multicomponent distillation
slide4

Tray Operation

Spray

Froth *

Emulsion

Bubble

Cellular foam

slide5

Types of Trays

Sieve

Valve

Bubble cap

slide7

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

slide8

Operation

Video:

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

“Design and Performance of Fractionating Devices”

http://www.fri.org/

slide9

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

slide10

Efficiencies

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

Flooding!

slide11

Efficiencies

Overall column efficiency:

Murphree efficiency:

slide13

Efficiencies

Seader & Henley, 2006

slide14

Efficiencies

P.C. Wankat, 2nd., 2007

slide15

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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