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 without using dichloromethane of a synthetic solvent in a conventional synthetic method. SOLUTION : The method for synthesizing the rare earth metal extractant comprising a dialkyl diglycol amid acid represented by general formula (1) (wherein, R1 and R2 are each same or different kind of alkyl, and at least one is ≥6C linear or branched alkyl) includes reacting diglycolic acid anhydride and a dialkylamine of raw materials of the dialkyl diglycol amid acid in a nonprotonic polar solvent, while regulating the molar ratio (B/A) of the dialkylamine (B) to the diglycolic acid anhydride (A) so as to be 1.0 or more, and a step for removing the nonprotonic polar solvent. The invention has a large utility value because the dialkyl diglycol amid acid having excellent ability for separating light rare earth elements can efficiently be synthesized in high yield without using the harmful dichloromethane. COPYRIGHT : (C)2012, JPO&INPIT