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The reaction of zinc chloride with dibutyl butylphosphonate in Exxsol DI00 has been studied. The distribution coefficient of zinc is independent of equilibrium pH, thus, suggesting a solvation extraction reaction. Experimental data indícate that this reaction is exothermic (AH°= -28.4 kJ/mol). Slope analysis for the system at various DBBP concentrations reveáis the formation in the loaded organic phases of species which probable 1:2 (Zn:DBBP) stoichiometries. This was confirmed by results obtained at full DBBP Zn-loading capacity. The stoichiometric factor of water in the extraction reaction is found to be 4, whereas experimental data also indicated that two chloride ions are involved for each metal extracted, resulting in a ZnCl2'2L-4H20 stoichiometry (L represents the extractant).

The extraction of zinc from chloride solutions using dibutyl butylphosphonate (DBBP) in Exxsol D100