Difference between revisions of "Liquid-liquid extraction - 2012"

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We start this section by looking at liquid-liquid extraction.


== References ==
== References ==
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* An article on [http://learnche.mcmaster.ca/media/mcmaster/Bailes-Liquid-liquid-extraction.pdf liquid-liquid extraction] which describes the various units available.
* An article on [http://learnche.mcmaster.ca/media/mcmaster/Bailes-Liquid-liquid-extraction.pdf liquid-liquid extraction] which describes the various units available.
* An article on [http://learnche.mcmaster.ca/media/mcmaster/Reissinger-Schroter--Selection-criteria-for-liquid-liquid-extraction-systems.pdf how to select among various liquid-liquid extraction units]
* The flowsheet for separating acetic acid from water using ethyl acetate solvent. This flowsheet has the mass flow rates, to help contrast it to distillation.
* The flowsheet for separating acetic acid from water using ethyl acetate solvent. This flowsheet has the mass flow rates, to help contrast it to distillation.
:[[Image:Acetic-acid-water-ethyl-acetate-flowsheet-Seader-3ed-p300.jpg|300px]]  
:[[Image:Acetic-acid-water-ethyl-acetate-flowsheet-Seader-3ed-p300.jpg|300px]] <span style="color:#8822AA">''click to enlarge''</span>
:<span style="color:#8822AA">''click to enlarge''</span>


== Week 8 ==
== Week 8 ==
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:[[Image:Board-30-Oct-2012.jpg|400px]] ''click to enlarge''
:[[Image:Board-30-Oct-2012.jpg|400px]] ''click to enlarge''


=== 31 Oct 2012 (09B) ===
=== 01 Nov 2012 (09B) ===


We should be able to wrap up the section by studying counter-current liquid-liquid extraction.
We should be able to wrap up the section by studying counter-current liquid-liquid extraction.
* [[Media:2012-4M3-class-08E.pdf | Slides for class]] (slides 42 to 59). Please '''print slides 48 to 54 on large, single pages''', to assist your learning.
* [[Media:2012-4M3-class-08E.pdf | Slides for class]]  
* [http://learnche.mcmaster.ca/media/4M3-2012-Class-09B.mp3 Audio] and [http://learnche.mcmaster.ca/media/4M3-2012-09B.mp4 video] recording of the class.
* [http://learnche.mcmaster.ca/media/4M3-2012-Class-09B.mp3 Audio] and [http://learnche.mcmaster.ca/media/4M3-2012-09B.mp4 video] recording of the class.
* Photo of the board during class
* Photo of the board during class
:[[Image:Board-01-Nove-2012.jpg|400px]] ''click to enlarge''
:[[Image:Board-01-Nove-2012.jpg|400px]] ''click to enlarge''


=== 01 Nov 2012 (09C) ===
=== 02 Nov 2012 (09C) ===
 
* [[Media:2012-4M3-class-08E.pdf | Slides for class]]
* There will be no formal teaching in class today. You can ask questions about assignment 4, and there will be a tutorial question from assignment 5.
* There will be no formal teaching in class today. You can ask questions about assignment 4, and there will be a tutorial question from assignment 5.
:Consider a system for which you have been given the ternary diagram (see slides, p 58). \(A\) = solute, \(S\) = solvent, \(C\) = carrier. The feed, \(F\) enters at 112 kg/hr with composition of 25 wt% solute and 75 wt% carrier.
:# Calculate the flow and composition of the extract and raffinate from:
:#* 1st co-current stage, using a pure solvent flow of 50 kg/hr.
:#& 2nd co-current stage, with an additional solvent flow of 50 kg/hr.
:# For the overall 2-stage system, find the:
:#* overall recovery
:#* overall concentration of combined extract streams
:The next objective is to have a counter-current system so the raffinate leaving in the \(N^\text{th}\) stage, \(R_N\) has \(y_{R_N} = 0.025\)
:# What is the maximum allowable solvent flow?
:# Explain whether it's possible to achieve an extract stream of \(y_{E_1} = 0.21\)?
:# Show the construction on the ternary diagram for the number of equilibrium stages to achieve \(y_{R_N} = 0.025\), given a solvent flow of 60 kg/hr.
:# Plot on the same axes the concentrations in the extract and raffinate streams.

Latest revision as of 20:12, 27 November 2012

Class date(s): 23 to 26 October 2012
Download video: Link [102 M]
Download video: Link [123 M]
Download video: Link [127 M]
Download video: Link [119 M]
Download video: Link [119 M]

References

Please use these references to read ahead, or for extra background reading on liquid-liquid extraction. In alphabetical order:

  • Ghosh, R. "Principles of Bioseparations Engineering", Chapter 7, McMaster (reserve)
  • Geankoplis, C.J. "Transport Processes and Separation Process Principles", Chapter 12 in 3rd and 4th edition, McMaster Libraries (reserve)
  • Perry's Chemical Engineers' Handbook, Chapter 15, Direct link (McMaster subscription)
  • Richardson and Harker, "Chemical Engineering, Volume 2", 5th edition, Chapter 13 ebook
  • Schweitzer, "Handbook of Separation Techniques for Chemical Engineers", Chapter 1.9, McMaster library
  • Seader, Henley and Roper, "Separation Process Principles", Chapter 8 in 2nd and 3rd edition McMaster Libraries (reserve)

Interesting applications / Enrichment materials

Acetic-acid-water-ethyl-acetate-flowsheet-Seader-3ed-p300.jpg click to enlarge

Week 8

23 Oct 2012 (08A)

25 Oct 2012 (08B)

26 Oct 2012 (08C)

Board-26-Oct-2012-A.jpg click to enlarge
Board-26-Oct-2012-B.jpg click to enlarge
Board-26-Oct-2012-C.jpg click to enlarge

Week 9

30 Oct 2012 (09A)

We will consider single and multiple co-current extraction.

Board-30-Oct-2012.jpg click to enlarge

01 Nov 2012 (09B)

We should be able to wrap up the section by studying counter-current liquid-liquid extraction.

Board-01-Nove-2012.jpg click to enlarge

02 Nov 2012 (09C)

  • Slides for class
  • There will be no formal teaching in class today. You can ask questions about assignment 4, and there will be a tutorial question from assignment 5.
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