Extraction equilibrium of indium(III) from nitric acid solutions by di(2-ethylhexyl)phosphoric acid dissolved in kerosene.
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.
Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei 10608, Taiwan.
Hung-Sheng
HS
Tsai
Teh-Hua
TH
Tsai
D000465:Algorithms; D002614:Chelating Agents / Q000737:chemistry; D003198:Computer Simulation; D056831:Coordination Complexes / Q000737:chemistry / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D007204:Indium / Q000737:chemistry / Q000302:isolation & purification*; D007648:Kerosene; D059625:Liquid-Liquid Extraction; D008956:Models, Chemical; D017942:Nitric Acid / Q000737:chemistry*; D010755:Organophosphates / Q000737:chemistry*; D012996:Solutions
D002614:Chelating Agents; D056831:Coordination Complexes; D007648:Kerosene; D010755:Organophosphates; D012996:Solutions; D007204:Indium; C007377:di-2-(ethylhexyl)phosphoric acid; D017942:Nitric Acid