In a method of removing phosphoric acid ester-based organic solvent extraction

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PROBLEM TO BE SOLVED : To provide a method of removing phosphoester extractant in organic solvent.SOLUTION : A method of removing phosphoester extractant in organic solvent comprises a step 1 of generating a deposit by adding a trivalent rare earth metal compound to organic solvent comprising phosphoester extractant, and a step 2 of removing the deposit generated in the step 1 by solid-liquid separation.