A METHOD FOR PREPARING A SOLUTION OF A RARE-EARTH ALKYL PHOSPHATE

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An embodiment of the present invention provides a method for manufacturing a rare earth alkylphosphoric acid solution, comprising the steps of : (a) making a base react with an alkylphosphoric acid in a solvent to manufacture an alkylphosphate solution; (b) reacting the alkylphosphate solution with a rare earth metal salt to manufacture a rare earth alkylphosphoric acid solution; and (c) washing the rare earth alkylphosphoric acid solution with water, and recovering and concentrating the organic phase, wherein the molar ratio of the base to the rare earth element in the rare earth metal salt is 2.0-3.0. The viscosity of the solution can be kept low even after a long period of time to enhance the processability and the layer separation phenomenon can be suppressed and the storage stability can be enhanced.COPYRIGHT KIPO 2018