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

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Presentation transcript:

“Chemical Engineering Equilibrium Separations” Lectures 12 & Oct 2012

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

AspenPlus: DSTWU 3

Tray Operation 4 a)Spray b)Froth * c)Emulsion d)Bubble e)Cellular foam

Types of Trays 5 a)Sieve b)Valve c)Bubble cap

Typical Flow Pattern 6

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

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

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

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

Efficiencies 11 Overall column efficiency: Murphree efficiency:

Efficiencies 12

Efficiencies 13 Seader & Henley, 2006

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

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

Questions? 16