THE USE OF N,N'-DIMETHYL-N,N'- DIPHENYLMALONAMIDE FOR IRON(III) EXTRACTION

N,N’-dimethyl-N,N,-diphenylmalomanide (DMDPHMA) has been proposed as selective reagent for extracting iron(III) from hydrochloric acid media. The influence of hydrochloric acid concentration on the extraction of Fe 3+ ions was studied. Iron(III) ions were completely extracted from the concentrated hydrochloric acid solution (>8 M). When the concentration of chloride ions was maintained at 12 M by LiCl addition to the aqueous phase, the yield of iron(III) was nearly 100%. The stripping of iron(III) from the loaded organic phase (1,2-dichloroethane) was achieved by simple contact with water. The possible extraction mechanism and the composition of the extracted iron(III) species have been determined by using UV, IR and NMR spectroscopic techniques. The results showed that the metal ion was extracted as FeCl 4 - complex.