Correlation of the extraction constant values of Cu(II) by 5-dodecylsalicylaldoxime from phosphoric acid media

Ocio, A.; Elizalde, M.P.

doi:10.1016/j.fluid.2009.07.012

Cited by 6 publications

(9 citation statements)

References 32 publications

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“…The release of water molecules during the extraction of the metal ions from phosphoric acid solutions has been pointed out in previous works [15,20]. Moreover, the number of water molecules released can depend on the total phosphoric acid concentration [20].…”

Section: Correlation Of the Stoichiometric Extraction Constants With mentioning

confidence: 90%

“…In that work, different models concerning concentrated phosphoric acid solutions have been analyzed and it was proved that Elmore's model [21], considering the presence of H 3 PO 4 , H 6 P 2 O 8 , H 2 PO − 4 and H 5 P 2 O − 8 , is suitable for understanding concentrated phosphoric acid solutions. Using a new procedure for the calculation of the activity coefficient of H 2 PO − 4 and considering the release of a variable number of water molecules during the extraction process, a satisfactory correlation of copper extraction constants has been reported [20].…”

Section: List Of Symbolsmentioning

confidence: 99%

“…A detailed work has been reported recently on the correlation of the extraction constants of copper from phosphoric acid solutions by LIX 622 (5-dodecylsalicylaldoxime) [20]. In that work, different models concerning concentrated phosphoric acid solutions have been analyzed and it was proved that Elmore's model [21], considering the presence of H 3 PO 4 , H 6 P 2 O 8 , H 2 PO − 4 and H 5 P 2 O − 8 , is suitable for understanding concentrated phosphoric acid solutions.…”

Section: List Of Symbolsmentioning

confidence: 99%

“…1 Variation of the activity coefficient of the species in solution as a function of the phosphoric acid concentration. Activity coefficients have been calculated according to: (a) Ocio and Elizalde [20], (b) Bromley's model [2,29], and (c) Davies model [30] The activity coefficients of H 3 PO 4 , H 6 P 2 O 8 , H 2 PO − 4 and H 5 P 2 O − 8 have been calculated as described previously [20], and are shown together with the activity coefficient of H + in Fig. 1a …”

Section: Chemical Model In the Aqueous Phasementioning

confidence: 99%

“…The free concentrations of H 2 PO − 4 needed for the calculations have been obtained from Elmore et al [21] as described elsewhere [20]. The values of the side reaction coefficient at each phosphoric acid concentration are also included in Table 1.…”

Section: Chemical Model In the Aqueous Phasementioning

confidence: 99%

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Correlation of the Extraction Constant Values of Zn2+ and Cd2+ from Phosphoric Acid Media by Bis(2,4,4-trimethylpentyl)dithiophosphinic Acid Dissolved in Toluene

2012

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Values of the extraction constants of Zn 2+ and Cd 2+ from aqueous phosphoric acid solutions (0.36 to 7.31 mol·L −1 ) by Cyanex 301 in toluene, involving formation of the complexes ZnR 2 and CdR 2 with R being bis(2,4,4-trimethylpentyl)dithiophosphinate, have been correlated at T = 298 K as a function of the ionic strength. For this purpose the activity coefficients of all of the aqueous species have been calculated taking into account both the protolytic equilibria of concentrated phosphoric acid and complexation reactions between the cations and the phosphoric acid species. Good correlations have been obtained for the extraction constant values with the ionic strength, provided the release of water molecules during the extraction processes is considered. Finally, extraction constant values are reported at infinite dilution.

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Section: Correlation Of the Stoichiometric Extraction Constants With mentioning

confidence: 90%

Section: List Of Symbolsmentioning

confidence: 99%