Effect of 1-alkyl-3-methylimidazolium di-2-ethylhexylsulfosuccinate on the extraction of lanthanides(III) with 1,3-bis[(diphenylphosphorylacetamido)methyl]benzene from nitric acid solutions

Abstract

It was found that the efficiency of extraction of lanthanide(III) ions from nitric acid solutions with 1,3-bis[(diphenylphosphorylacetamido)methyl]benzene significantly increases in the presence of ionic liquids, 1-alkyl-3-methylimidazolium di-2-ethylhexylsulfosuccinates, in the organic phase. The partition of ionic liquids between the organic and aqueous phases was studied depending on the concentration of the ionic liquid and nitric acid. The stoichiometry of the extractable lanthanide(III) complexes was determined by the equilibrium shift method. The influence of the length of alkyl radicals in the cationic part of the ionic liquid and the concentration of HNO3 in the aqueous phase on the efficiency of the extraction of metal ions into the organic phase containing the ionic liquid was considered.