Effect of the salting-out agent anion nature on the phase separation of a potassium salt–potassium bis(alkyl polyoxyethylene)phosphate–water systems
- Authors: Elokhov A.M.1, Lesnov A.E.1, Kudryashova O.S.2
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Affiliations:
- Institute of Technical Chemistry, Ural Branch
- Institute of Natural Science
- Issue: Vol 90, No 10 (2016)
- Pages: 1972-1977
- Section: Physical Chemistry of Solutions
- URL: https://journals.rcsi.science/0036-0244/article/view/168832
- DOI: https://doi.org/10.1134/S0036024416100101
- ID: 168832
Cite item
Abstract
The effect the salting-out agent anion nature has on the temperature and concentration intervals of the existence of the separation area is established by analyzing the phase diagrams of pseudoternary KCl (KBr, KI, KNO3, K2SO4, K4P2O7)–potassium bis(alkyl polyoxyethylene)phosphate (oxyphos B)–water systems. It is concluded that the anionic salting-out capability is reduced in the order P2O74-> SO42-> Cl− > Br‒> NO74-> SO3-> I−. The thermodynamic parameters of phase separation used to interpret the results are calculated. The observed pattern of a change in the salting-out ability of the investigated salts relative to aqueous solutions of the surfactants is in good agreement with the lyotropic (Hofmeister) series.
Keywords
About the authors
A. M. Elokhov
Institute of Technical Chemistry, Ural Branch
Author for correspondence.
Email: elhalex@yandex.ru
Russian Federation, Perm, 614013
A. E. Lesnov
Institute of Technical Chemistry, Ural Branch
Email: elhalex@yandex.ru
Russian Federation, Perm, 614013
O. S. Kudryashova
Institute of Natural Science
Email: elhalex@yandex.ru
Russian Federation, Perm, 614990