Improved separation of rare earth elements using hydrophobic deep eutectic solvents: liquid-liquid extraction to selective dissolution
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Updated: Nov 4, 2026

Synthesis of High Purity Nonsymmetric Dialkylphosphinic Acid Extractants
Published on: October 19, 2017
Takafumi Hanada1, Nicolas Schaeffer2, Masahiro Katoh1
1Department of Applied Chemistry, Graduate School of Technology, Industrial and Social Sciences, Tokushima University 2-1 Minamijosanjima Tokushima Japan hanada@tokushima-u.ac.jp.
Abstract:
Deep eutectic solvents (DESs) composed of a beta-diketone and phosphine oxides featuring different alkyl chain lengths were prepared and then employed as liquid-liquid extraction and dissolution media for the separation of iron, cobalt, neodymium, and dysprosium. In the dissolution the more sterically hindered DESs exhibited enhanced selectivity to neodymium, which was poorly separated using liquid-liquid extraction. The dissolution selectivity in less sterically hindered DESs could be controlled by the addition of organic acids with different alkyl chain lengths.
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