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Extraction chemistry of palladium I. Study on the mechanism of synergistic extraction of palladium (II) with 1-phenyl-3-methyl-4-dichloroacetopyrazolone-5-one and diphenyl sulfoxide

ABSTRACT l-Phenyl-3-methyl-4-dichloroacetopyrazolone-5-one (HPMDCP), which is an acidic chelating β-diketone extractant, was synthesized by acylation reaction in dioxane medium. The behavior of synergistic extraction of palladium (II) with HPMDCP and diphenyl sulfoxide (DPSO) has been studied. The results show that an antagonistic effect was observed under the given conditions. To understand this phenomenon, a preliminary work was performed to explain the mechanism of this reaction. According to the theory of the corresponding solutions (TCS), the association reaction between HPMDCP and DPSO in the organic phase was discussed. The results show that the associate species HPMDCP.DPSO formed in chloroform medium is the main reason why an antagonistic extraction effect occurs. The association constant between HPMDCP and DPSO in the extraction process was calculated to be 4.2.