| 简介 |
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.
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