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Unit Operations Lecture 20 PowerPoint PPT Presentation


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Unit Operations Lecture 20. 7 Nov 2012. McCabe-Thiele – AZ diagrams. Ethanol – Water Binary (1.013 bar):. Overview. Review rigorous methods / RADFRAC Multicomponent systems: Residue curves DSTWU / RADFRAC Rules of thumb Complex (Enhanced) distillation Column internals

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Unit Operations Lecture 20

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Unit operations lecture 20

Unit Operations

Lecture 20

7 Nov 2012


Unit operations lecture 20

McCabe-Thiele – AZ diagrams

Ethanol – Water Binary (1.013 bar):


Unit operations lecture 20

Overview

  • Review rigorous methods / RADFRAC

  • Multicomponent systems:

    • Residue curves

    • DSTWU / RADFRAC

    • Rules of thumb

  • Complex (Enhanced) distillation

  • Column internals

  • Batch distillation


Unit operations lecture 20

Azeotropic Distillation

Perry’s 8th ed.


Unit operations lecture 20

AzeotropicDistillation

  • Water with (binary system at atmospheric P):

  • methanol- no azeotrope

  • ethanol- azeotrope

  • propanol- azeotrope

  • In-class exercise:

  • using Aspen Plus, explore if we can use distillation to separate the binary mixture of water and n-butanol.


Unit operations lecture 20

Heterogeneous Azeotropic Distillation

VLLE (NRTL)


Unit operations lecture 20

Heterogeneous Azeotropic Distillation

Perry’s 8th ed.


Unit operations lecture 20

Residue Curve Maps


Unit operations lecture 20

Complex Multicomponent Systems


Unit operations lecture 20

Pressure Swing Distillation


Unit operations lecture 20

Pressure Swing Distillation


Unit operations lecture 20

Complex or Enhanced Distillation

  • Extractive Distillation

    • Higher boiling solvent

    • Enters near top of column

    • Interacts with other components to affect volatility or activity coefficients

  • Homogeneous Azeotropic Distillation

    • Add entrainer that forms min/max boiling point AZ w/ 1 or more of feed compds

    • Added near top or bottom, depending upon if AZ is min or max BP

  • Heterogeneous Azeotropic Distillation

    • Add entrainer to form min BP heterogeneous azeotrope (EtOH-H2O + benzene)

  • Pressure – Swing Distillation

    • For pressure sensitive azeotropes and distillation boundaries

  • Salt Distillation

    • Alter relative volatilities of feed compds by dissolving a soluble ionic salt into the reflux

  • Steam Distillation

    • Steam is added to reduce temperature of distilling organic mixture

  • Reactive Distillation

    • add reactant &/or catalyst to cause a reversible/selective reaction with one of the feed components

    • Reaction and distillation occur in same vessel


Unit operations lecture 20

Reactive Distillation

  • Esterification of acetic acid with ethanol to ethyl acetate and water


Unit operations lecture 20

Column Internals


Unit operations lecture 20

Column Internals


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