Hydrophobic Eutectic Solvents Based on Alcohol and Camphor in the Extraction of Fe(III) from Hydrochloric Solutions

New hydrophobic eutectic solvents based on linalool, geraniol, and camphor have been proposed as extractants for Fe(III) ions from hydrochloric acid solutions. Temperature dependencies of key physical properties of the proposed eutectic solvents have been studied. The extraction of Fe(III) ions from aqueous solutions was investigated depending on process conditions: acidity of the medium, component ratio in the eutectic solvent, salting-out agent concentration, and volume ratio of phases. During the extraction of iron chloride with hydrophobic eutectic solvents linalool/camphor and geraniol/camphor, compounds of the composition (ROH2)+[FeCl4]– are formed in the organic phase. It is shown that the addition of camphor improves the extraction properties of alcohols, with geraniol being a more effective extractant than linalool. The re-extraction of Fe(III) ions from the organic phase is carried out using distilled water without the introduction of additional reagents.