Effect of alkyl chain length of o-hydroxyoxime on the extraction of copper.

• DOI: 10.1252/jcej.19.117
• Publication Date: 2008-01-16T14:30:30Z
• Authors: YOSHIKAZU MIYAKE; YASUNOBU IMANISHI; YUJI KATAYAMA; TOSHITSUGU HAMATANI; MASAAKI TERAMOTO
• Keywords: 02 engineering and technology; 0204 chemical engineering

The solvent extraction of copper by use of the homologous series of o-hydroxyoxime with different alkyl chains was studied to elucidate the extraction mechanism. The physicochemical properties of hydroxyoxime required to evaluate the extraction rate, such as the distribution constant, interfacial properties, pKa and extraction constant, were measured. The forward and stripping extraction rates were measured by a Lewis-type transfer cell. The extraction rate of copper by a water-soluble, surface-inactive agent can be reasonably interpreted by considering the diffusion process with complex formation in the aqueous stagnant layer. Complex formation is limited by the rate of 1:1 complex formation. On the other hand, the extraction rate with an insoluble, surface-active reagent can be interpreted by the interfacial reaction, which is limited by the reaction rate between the adsorbed 1:1 complex and the dissolved reagent in the aqueous phase.