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 amide 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 amide acid by using, as the synthetic solvent, a nonpolar or low polar solvent capable of dissolving the dialkyl diglycol amide acid as an organic solvent forming an organic phase in solvent extraction, and regulating the molar ratio (B/A) of the dialkylamine (B) to the diglycolic acid anhydride (A) so as to be 1.0 or more. The invention has a large utility value because the dialkyl diglycol amide 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