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Amidophosphonate ligands as cerium extractants in supercritical CO$_2$

Abstract : Industrial-scale rare earth extraction is typically performed by liquid-liquid extraction with large amounts of solvents, acids and organophosphorus ligands. An alternative is to use these extractants in supercritical CO$_2$ (SC-CO$_2$), where the crucial operating parameter is their solubility. Different molecules with amidophosphonate backbones have been synthesized and investigated in view of improving their solubility in SC-CO$_2$ and thereby their cerium extraction capacity. The CO$_2$-philicity of these extractants was adjusted by attaching branched or linear alkyl chains with four, six and eight carbons. Using a dynamic gravimetric setup, the solubility and cerium extraction capacity of these molecules were measured to vary from 1.56 to 2.47 mmol$_{ligand}$.mol$_{CO2}$$^{-1}$ and 0.25 to 0.46 mmol$_{Ce}$.mol$_{ligand}$$^{-1}$, respectively.The two properties were correlated and in both cases the highest values were obtained with a diisobutylamine chain. Solubility measurements between 313 and 331 K and between 13 and 28 MPa shows that optimal condition is (320 K ; 28 MPa).
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Submitted on : Tuesday, March 17, 2020 - 2:15:53 PM
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Sofyane Bouali, Antoine Leybros, Guillaume Toquer, Antoine Leydier, Agnès Grandjean, et al.. Amidophosphonate ligands as cerium extractants in supercritical CO$_2$. Journal of Supercritical Fluids, Elsevier, 2019, 149, pp.64-69. ⟨10.1016/j.supflu.2019.03.025⟩. ⟨cea-02510041⟩

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