Effect of the Addition of Amine in Organophosphorus Compounds on Molecular Structuration of Ionic Liquids-Application to Solvent Extraction.

Soumaya Gmar, Fabrice Mutelet, Alexandre Chagnes

Molecules (Basel, Switzerland) 2020 Jun 02

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Variation of dynamic viscosity, density and enthalpy as a function of mole fraction of amine (tri-n-octylamine, triisooctylamine, bis(2-ethylhexyl)amine) in bis(2-ethylhexyl) phosphoric acid (D2EHPA) or Cyanex 272, (bis(2,4,4-trimethylpentyl)phosphinic acid) has been determined at 25 °C. Valuable information regarding structuration and destabilization of the corresponding ionic liquids has been deduced from these data. A simple model describing the variation of dynamic viscosity as a function of mole fraction of amine has been used to determine the speciation in these mixtures. Extraction tests of cobalt(II) and nickel(II) by D2EHPA-amine mixtures have shown the highest cobalt(II)-nickel(II) selectivity has been achieved with D2EHPA-2-ethylhexylamine mixture as cobalt(II) extraction efficiency of 77% was obtained, while no significant nickel(II) extraction was observed at a chloride concentration of 3 mol·L-1.

Citation

Soumaya Gmar, Fabrice Mutelet, Alexandre Chagnes. Effect of the Addition of Amine in Organophosphorus Compounds on Molecular Structuration of Ionic Liquids-Application to Solvent Extraction. Molecules (Basel, Switzerland). 2020 Jun 02;25(11)