Solid-liquid separation after liquid-liquid extraction Distribution of oxine (a-hydroxyquinoline) and copper oxinate between naphthalene and aqueous phase at 90°C

摘要

The distribution equilibria of oxine or copper oxinate between naphthaleneand aqueous phase were studied by the method of liquid-liquid extractionfollowed by solid-liquid separation using naphthalene as the solvent, andcompared with the result obtained by the conventional method of liquid-liquidextraction using chloroform as the solvent. In a previous paper, Fujinaga,Kuwamoto, Nakayama and the author showed that the copper oxinate wasextracted quantitatively into naphthalene at 90°C in the pH range larger than4. This extraction behavior is quite identical to that into chloroform at roomtemperature, in spite of the difference in the experimental temperature andof the solvent used. The present investgation was performed to elucidate thereason of this similarity of both method in the extraction of copper oxinateand to determine the equilibrium data of oxine and copper oxinate at 90°C.