IONIC LIQUID-ACID AQUEOUS TWO-PHASE SYSTEM

摘要

The application relates to a process for extracting or separating metal ions using a composition comprising: - an ionic liquid of formula C ⁺,-X, in which: - C ⁺ is an onium cation comprising at least one hydrocarbon chain R ¹ comprising from 6 to 20 carbon atoms, - X ^P - is an anion of charge p, said ionic liquid having a solubility in water at 20°C of at least 10 g/l, - an acid, and - water, said composition comprising two liquid phases: - a phase enriched in ionic liquid ϕ _IL and - a phase enriched in water ϕ _w, the pH of which is less than or equal to 4.7, and the uses of the composition for extracting a metal ion from an acidic aqueous medium comprising a metal ion, for separating metal ions from an aqueous medium comprising at least two metal ions or for purifying an acidic aqueous solution comprising a metal ion.