View source for Liquid-liquid extraction - 2014

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{{ClassSidebar
| date = 29 October 2014
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| course_notes_alt = Course notes
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== 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, [http://catalogue.mcmaster.ca/catalogue/Record/1405538 McMaster] (reserve)
* Geankoplis, C.J. "Transport Processes and Separation Process Principles", Chapter 12 in 3rd and 4th edition, [http://catalogue.mcmaster.ca/catalogue/Record/1219775 McMaster Libraries] (reserve)
* Perry's Chemical Engineers' Handbook, Chapter 15, [http://accessengineeringlibrary.com/browse/perrys-chemical-engineers-handbook-eighth-edition/p200139d899720_36001 Direct link] (McMaster subscription)
* Richardson and Harker, "Chemical Engineering, Volume 2", 5th edition, Chapter 13 [http://books.google.ca/books/about/Coulson_and_Richardson_s_Chemical_Engine.html?id=ottGCe1CDUoC ebook]
* Schweitzer, "Handbook of Separation Techniques for Chemical Engineers", Chapter 1.9, [http://catalogue.mcmaster.ca/catalogue/Record/1156427 McMaster library]
* Seader, Henley and Roper, "Separation Process Principles", Chapter 8 in 2nd and 3rd edition [http://catalogue.mcmaster.ca/catalogue/Record/1270236 McMaster Libraries] (reserve)

{| class="wikitable"  style="text-align: center;"
|-
! Date
! Class number
! Topic
! Slides for class
! colspan="2"|Video and audio files
! References and Notes
|-
| 29 October
| 09B
| align="left" colspan="1"|
Liquid liquid extraction overview
| align="left" colspan="1"|
[[Media:2014-4M3-Liquid-Liquid-Extraction.pdf|Slides]]  
| [http://learnche.mcmaster.ca/media/2014-4M3-Class-09B.mp4 Video] 
| [http://learnche.mcmaster.ca/media/2014-4M3-Class-09B.mp3 Audio]
|align="left" colspan="1"|
A comprehensive article on [http://learnche.mcmaster.ca/media/mcmaster/Bailes-Hanson-Hughes--Liquid-liquid-extraction.pdf liquid-liquid extraction] which describes the various units available.
|-
| 04 November
| 10A
| align="left" colspan="1"|
Liquid liquid extraction theory and calculations
| align="left" colspan="1"|
[[Media:2014-4M3-Liquid-Liquid-Extraction.pdf|Slides]]  
| [http://learnche.mcmaster.ca/media/2014-4M3-Class-10A.mp4 Video] 
| [http://learnche.mcmaster.ca/media/2014-4M3-Class-10A.mp3 Audio]
|align="left" colspan="1"|
* 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]] <span style="color:#8822AA">''click image to enlarge''</span> 
[reference: Seader ''et al.'', p300]
|-
| 05 November
| 10B
| align="left" colspan="1"|
Liquid liquid extraction example calculations
| align="left" colspan="1"|
[[Media:2014-4M3-Liquid-Liquid-Extraction.pdf|Slides]]  
| [http://learnche.mcmaster.ca/media/2014-4M3-Class-10B.mp4 Video] 
| [http://learnche.mcmaster.ca/media/2014-4M3-Class-10B.mp3 Audio]
|align="left" colspan="1"|
* The [[Media:Seader-ternary-example-base.pdf|ternary diagram that will be used in today's class]]. Download and print it out for practice problems.
* Here's [http://webpages.sdsmt.edu/~ddixon/CBE417_Lec_23_LLE_Draft_3-print.pdf another instructor's slides] on the same topic - sometimes a different point of view helps to understand.
|-
| 07 November
| 10C
| align="left" colspan="1"|
Liquid liquid extraction example calculations
| align="left" colspan="1"|
[[Media:2014-4M3-Liquid-Liquid-Extraction.pdf|Slides]]  
| [http://learnche.mcmaster.ca/media/2014-4M3-Class-10C.mp4 Video] 
| [http://learnche.mcmaster.ca/media/2014-4M3-Class-10C.mp3 Audio]
|align="left" colspan="1"|
Web links shown in the class:
* [http://modularprocess.com/liquid-extraction/extraction-column-types/rdc/ Rotating disc column]
* [http://modularprocess.com/liquid-extraction/extraction-column-types/karr-columns/ Karr column]
* [http://modularprocess.com/liquid-extraction/extraction-column-types/scheibel-columns/ Scheibel column]
* [http://modularprocess.com/liquid-extraction/extraction-column-types/other-columns/ Pulsed and packed columns]
|-
| 11 November
| 11A
| align="left" colspan="1"|
Liquid liquid extraction example calculations
| align="left" colspan="1"|
[[Media:2014-4M3-Liquid-Liquid-Extraction.pdf|Slides]]  
| [http://learnche.mcmaster.ca/media/2014-4M3-Class-11A.mp4 Video] 
| [http://learnche.mcmaster.ca/media/2014-4M3-Class-11A.mp3 Audio] 
|align="left" colspan="1"|
These readings seem old, but they are still relevant. For example, the same principles are used in modern bioseparations.

# A [http://learnche.mcmaster.ca/media/mcmaster/Hanson--Solvent-extraction.pdf reading on solvent extraction principles] 
# A general article on [http://learnche.mcmaster.ca/media/mcmaster/Reissinger-Schroter--Liquid-liquid-extractors.pdf liquid liquid extractors].
# An interesting [http://learnche.mcmaster.ca/media/mcmaster/Moore--Using-principles-of-inherent-safety-in-design-of-hydrometallurgical-solvent-extraction-plants.pdf reading on safety in liquid-liquid extraction plants]: a further reason for counter-current operations to minimize solvent use.
|-
| 12 November
| 11B
| align="left" colspan="1"|
Liquid liquid extraction example calculations
| align="left" colspan="1"|
[[Media:2014-4M3-Liquid-Liquid-Extraction.pdf|Slides]]  
| [http://learnche.mcmaster.ca/media/2014-4M3-Class-11B.mp4 Video] 
| [http://learnche.mcmaster.ca/media/2014-4M3-Class-11B.mp3 Audio] 
|align="left" colspan="1"|
|}

== Exercise ==

A stream of acetic acid and water (also called diluent) is being fed in a counter current manner at 1000 kg/hour, in order to extract the acetic acid. The feed composition is 30 wt% acetic acid, and 70 wt% water.
    
The solvent is 99% pure IPE (isopropyl ether), and contains 1% acetic acid, at an inlet flow of 2500 kg/hour.
    
We desire the exiting raffinate stream to contain 5 wt% acetic acid.
    
#  Find the number of equilibrium stages to achieve this separation (show all calculations).
#  Calculate the exiting raffinate flow, and the exiting extract flow rate.

Unfortunately, we don't have the equilibrium data, however, various samples of the 3 species were made, mixed, and when they came to equilibrium they were found to have the following compositions (each row gives the aqueous and organic phase compositions):

[[Image:Adsorption-example-from-VLE-raw-data.png|500px]]

Feel free to download and use [http://upload.wikimedia.org/wikipedia/commons/8/81/Ternary_plot_1.png this empty ternary diagram]. 

See [http://www.youtube.com/watch?v=N7MIH0_ELO0 this YouTube video] for the full solution..
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