Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei 10608, Taiwan.
Molecules. 2012 Jan 4;17(1):408-19. doi: 10.3390/molecules17010408.
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.
研究了用二（2-乙基己基）磷酸（D2EHPA）作为溶解在煤油中的有机磷化合物的酸性萃取剂，从硝酸溶液中萃取铟（III）的萃取平衡。通过图形和数值分析，考察了有机相中的铟-D2EHPA 配合物的组成和萃取反应的化学计量。在 25°C 下，使用不同铟浓度的硝酸溶液获得了有机相中的 InR₃ 的平衡常数。实验结果表明，当水相的 pH 值和/或有机相萃取剂的浓度增加时，铟（III）在有机相和水溶液之间的萃取分配比增加。最后，测量了硝酸中铟（III）的回收效率。
