Effect of hydrophobic ionic liquids aqueous solubility on metal extraction from hydrochloric acid media: Mathematical modelling and trivalent thallium behavior

A mathematical model to explain cations’ solubility of both protic and aprotic ionic liquids in a wide range of hydrochloric acid solutions has been developed. The concept of this model is based on an assumption of the mineral acid extraction into the organic phase, formation of a salt there between...

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Bibliographic Details
Published in:Separation and purification technology 2021-01, Vol.255 (C), p.117650, Article 117650
Main Authors: Tereshatov, Evgeny E., Mazan, Valérie, Boltoeva, Maria, Folden, Charles M.
Format: Article
Language:English
Subjects:
Chemical Sciences
Ionic liquid
Mathematical model
Mechanism
or physical chemistry
Radiochemistry
Solubility
Thallium
Theoretical and
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Summary:A mathematical model to explain cations’ solubility of both protic and aprotic ionic liquids in a wide range of hydrochloric acid solutions has been developed. The concept of this model is based on an assumption of the mineral acid extraction into the organic phase, formation of a salt there between an ionic liquid cation and chloride-anion due to ions recombination and partial salt back-extraction. The proposed approach allows estimating corresponding extraction constants. Comparison of calculated and experimentally measured solubility product constants shows that they are in good agreement. It has been determined also that the more the hydrophilicity of the ionic liquids’ cation the more hydrochloric acid is extracted. This model has been utilized to facilitate analysis of thallium transfer into hydrophobic ionic liquids providing insights into the mechanism of metal extraction.
ISSN:1383-5866
1873-3794
DOI:10.1016/j.seppur.2020.117650