Thermodynamics of Extraction of Selenium by Tri-iso-octyl Amine (TIOA) from Chloride Medium

The equilibrium distribution of selenium in hydrochloric acid medium and with the chloride salt of tri-iso-octylamine (TIOA) in xylene was studied. Experimental data were analyzed graphically and numerically to determine the stoichiometry of the extraction species. It was found that the extraction r...

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Bibliographic Details
Published in:Separation science and technology 2005-01, Vol.39 (9), p.2207-2221
Main Authors: Mandal, Dilip Kumar, Bhattacharya, Badal, Das, Raj Dulal
Format: Article
Language:English
Subjects:
Extraction
Selenium
Thermodynamic parameters
TIOA
Xylene
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Summary:The equilibrium distribution of selenium in hydrochloric acid medium and with the chloride salt of tri-iso-octylamine (TIOA) in xylene was studied. Experimental data were analyzed graphically and numerically to determine the stoichiometry of the extraction species. It was found that the extraction reaction is endothermic (ΔH = +17.060 KJ/mol). Selenium was extracted by the reaction: The effect of extractant concentration, equilibration period, diluents, and diverse ion and stripping agents on the extraction of selenium were studied. The distribution constant and the thermodynamic parameters enthalpy (ΔH), entropy (ΔS), and free energy (ΔG) were evaluated.
ISSN:0149-6395
1520-5754
DOI:10.1081/SS-120034189