METHOD FOR SYNTHESIZING RARE EARTH METAL EXTRACTANT

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PROBLEM TO BE SOLVED : To provide a method for synthesizing a rare earth metal extractant capable of improving the yield of a synthesized product and the efficiency of synthetic process, and reducing the cost of the dialkyl diglycol amid acid of the metal extractant without using diglycolic anhydride of a synthetic raw material and dichloromethane of a reaction solvent in a conventional synthetic method. SOLUTION : The method for synthesizing the rare earth metal extractant comprising the dialkyl diglycol amid acid as an extractant component includes reacting the diglycolic acid of X mol in an esterification agent of Y mol regulated so that the molar ratio of Y/X may be ≥2.5 at a reaction temperature of ≥70°C for a reaction time of ≥1 h, condensing the reaction product under a reduced pressure to remove the unreacted components and a reaction residue and to provide a reaction intermediate product, adding a nonprotonic polar solvent as a reaction solvent, reacting the reaction intermediate product with the dialkylamine of Z mol while regulating the molar ratio Z/X may be ≥0.9, and removing the nonprotonic polar solvent. The invention has a large utility value because the dialkyl diglycolic acid having excellent ability for separating light rare earth elements can efficiently be synthesized in high yield at a low cost without using expensive diglycolic anhydride and the harmful dichloromethane. COPYRIGHT : (C)2012, JPO&INPIT