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Molecules 2012, 17(1), 408-419; doi:10.3390/molecules17010408

Extraction Equilibrium of Indium(III) from Nitric Acid Solutions by Di(2-ethylhexyl)phosphoric Acid Dissolved in Kerosene

Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei 10608, Taiwan
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Author to whom correspondence should be addressed.
Received: 30 November 2011 / Revised: 26 December 2011 / Accepted: 30 December 2011 / Published: 4 January 2012
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Abstract

The extraction equilibrium of indium(III) from a nitric acid solution using di(2-ethylhexyl) phosphoric acid (D2EHPA) as an acidic extractant of organophosphorus compounds dissolved in kerosene was studied. By graphical and numerical analysis, the compositions of indium-D2EHPA complexes in organic phase and stoichiometry of the extraction reaction were examined. Nitric acid solutions with various indium concentrations at 25 °C were used to obtain the equilibrium constant of InR3 in the organic phase. The experimental results showed that the extraction distribution ratios of indium(III) between the organic phase and the aqueous solution increased when either the pH value of the aqueous solution and/or the concentration of the organic phase extractant increased. Finally, the recovery efficiency of indium(III) in nitric acid was measured.
Keywords: extraction; equilibrium; indium; di(2-ethylhexyl)phosphoric acid; D2EHPA extraction; equilibrium; indium; di(2-ethylhexyl)phosphoric acid; D2EHPA
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Tsai, H.-S.; Tsai, T.-H. Extraction Equilibrium of Indium(III) from Nitric Acid Solutions by Di(2-ethylhexyl)phosphoric Acid Dissolved in Kerosene. Molecules 2012, 17, 408-419.

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