Junji Shibata1 and Sanji Nishimura1
1Department of Chemical Engineering, Kansai University, Suita
The distribution of Cu, Ni and Co between an aqueous solution of constant ionic strength and Versatic Acid 911 diluted with benzene was studied. Only one extracted species of Cu was revealed to have a dimeric structure of the composition (CuR2⋅RH)2, while both monomer and dimer were found in the extraction of Ni and Co. The compositions of the extracted species were NiR2⋅4RH and (NiR2⋅2RH)2, and CoR2⋅4RH and (CoR2⋅2RH)2, respectively.
The effect of sulphate and chloride ions on the extraction of these metals was also investigated. These ions are not extracted into the organic phase, and they affect the metal extraction only by forming metal complexes with sulphate and chloride ions in the aqueous solution. However, the effect of sulphate and bisulphate ions appears when a stronger extractant than Versatic Acid 911 such as D2EHPA is employed.
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