Single Solute Batch Two-Phase Extraction

Requires a Wolfram Notebook System

Interact on desktop, mobile and cloud with the free Wolfram Player or other Wolfram Language products.

A single solute, , is being transferred from a feed into an immiscible fresh solvent, , in a batch two-phase extraction system. This Demonstration displays the dynamic approach to equilibrium for values of the linear equilibrium distribution constant, the solvent to feed-charge ratio, and the mass-transfer capacity coefficient, all to be set by the user.

[more]

The solute balances in the feed and solvent are given by

and

,

where is the mass transfer capacity coefficient expressed in , and are the concentrations of solute in the feed and solvent (), respectively, and is the feed to solvent charge ratio. Assuming a linear equilibrium relationship gives , where is the equilibrium distribution constant.

Values of the fractional extraction, defined as , are also determined. The red and blue curves correspond to the solute concentrations in the feed and solvent phases, respectively.

Observe that both and have an effect on the system time constant. Indeed, the steady-state concentration is reached faster when, for instance, you increase

As expected, has no effect on the values of the fractional extraction. On the other hand, the fractional extraction is affected by the choice of and .

[less]

Contributed by: Housam Binous (September 2008)
Open content licensed under CC BY-NC-SA


Snapshots


Details

J. Ingham, I. J. Dunn, E. Heinzle, and J. E. Prenosil, Chemical Engineering Dynamics, 2nd ed., Weinheim, Germany: Wiley-VCH, 2000 pp. 494–496.



Feedback (field required)
Email (field required) Name
Occupation Organization
Note: Your message & contact information may be shared with the author of any specific Demonstration for which you give feedback.
Send