Liquid-liquid extraction of Pd(II) from hydrochloric acid solutions using di-(2-ethylhexyl) thiophosphoric acid (DEHTPA or HL) dissolved in kerosene has been studied. The distribution equilibrium of DEHTPA between the aqueous phase and the organic phase was investigated by treating the data with the computer program LETAGROP-DISTR. The extraction of Pd(II) from HC1 solutions by DEHTPA was studied as a function of several variables: equilibration time, organic phase diluent, HC1 and DEHTPA concentrations as well as temperature. Experimental equilibrium data were analyzed numerically using the program LETAGROP-DISTR and the results showed that Pd(II) extraction can be explained assuming the formation of PdL2 complexes in the organic phase. DEHTPA was found to be selective for Pd(II) against Pt(IV), Rh(HI), Cu(II), Fe(III) and Zn(II). The back-extraction of Pd(II) loaded in the organic phase using different stripping reagents is also reported.
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Rovira et al. (1999) studied this question.
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