Liquid-Liquid Extraction (LLE) on a Right-Triangle Ternary Phase Diagram

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This Demonstration shows how to use the Hunter–Nash method on a right-triangle ternary phase diagram.

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Check "grid lines" to show grid lines on the diagram. Check "carrier compositions" to show the carrier mass fractions on the diagram.

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Contributed by: Rachael L. Baumann (September 2017)
Additional contributions by: John L. Falconer
(University of Colorado Boulder, Department of Chemical and Biological Engineering)
Open content licensed under CC BY-NC-SA


Snapshots


Details

The feed composition is selected within a narrow range of compositions, but the solvent composition and the desired raffinate composition are specified. The extract composition and the number of stages to obtain the desired raffinate composition are determined by mass balances. First, the composition of the mixing point is calculated and located on the ternary phase diagram. The mixing point corresponds to the composition that would be obtained if the feed and the solvent flows were mixed together.

This equation is rearranged to determine the operating point:

A mass balance in stage 1 (total feed in = total feed out) is:

which can be written as:

See [1–4] for screencasts that describe the Hunter–Nash method and present examples.

References

[1] Hunter–Nash Method: Liquid-Liquid Extraction [Video]. Retrieved July 31, 2017, from www.youtube.com/watch?v=e0Yt5RMkyj4.

[2] Hunter–Nash Method: Liquid-Liquid Extraction Example [Video]. Retrieved July 31, 2017, from www.youtube.com/watch?v=FaKIZU3XPR8.

[3] Hunter–Nash Method 1: Mixing and Operating Points [Video]. Retrieved July 31, 2017, from www.youtube.com/watch?v=-yW0jIcH0_E.

[4] Hunter–Nash Method 2: Number of Stages [Video]. Retrieved July 31, 2017, from www.youtube.com/watch?v=JZuavrt8ksQ.



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