How to calculate equilibrium extractant concentration in solvent extraction to obtain equilibrium constants in using acidic extractants (like D2EHPA)?
The common method for calculation of equilibrium concentration of extractant is using the material balance, i.e. it is equal to the difference between total (analytical) concentration of extractant and the sum of all solvated species in the solvent phase.
Though you need to know their stechiometry to calculate how many solvent molecules are bound to each solvate.
Yes Mr. Puzikov is rightly said here. You can calculate the equilibrium extractant concentration by using the material balance Ex. [D2EHPHA]org, eqm =[D2EHPA]int-n[D2EHPA.HA]complex,eqm. Where, "n" is stoichimetry number of solute while making complex with organic extractant and [D2EHPA.HA] is a complex or solute concentration in organic phase after equilibrium. You can calculate this "n" from the equilibrium plot given in our paper (dx.doi.org/10.1080/19443994.2015.1093550). If you need more details about D2EHPA complex with other species like cobalt, etc. you may read this article among our group (doi:10.1016/j.cherd.2012.06.019).
Suggested reference: D.A. Ellis, "Prediction of multistage solvent extraction operation from limited data", Industrial and Engineering Chemistry, 52(3) March 1960, 251-252.
On application of McCabe-Thiele (graphical) method to extraction mass-transfer problems at liquid-liquid extraction: https://www.researchgate.net/post/How_to_construct_McCabe_Thiele_diagram_for_LLE_and_is_there_any_software_for_LLE_simulation
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