Effect of Trioctylmethylammonium Chloride on the Extraction Rate of Iron(III)-TTA Complex

Abstract

The mechanism of a rate promoted synergistic effect of trioctylmethylammonium chloride (R3RiNCl: Capriquat) on the extraction of iron (III) with 2-thenoyltrifluoroacetone (TTA=HE) was studied. The above effect of Capriquat at low chloride concentration region could be explained by a possible formation of R3R'NE. The effect of Capriquat became more remarkable by the presence of large amounts of chloride ion. The rate determining step in the extraction process of FeE3 into benzene was dependent on the TTA concentration used: FeCl3+R3R'N+R3R'NFeCl3(OH)+H+C1R3R'NFeCl3(OH)Cl-R3R'NFeCl4+OHE-R3R'FeCl3E+OHR3R'NFeC13E-E-R3R'NFeCl3E+OHThe final product obtained through the above reactions has already been confirmed to be FeE3 in the benzene phase by the authors (Bunseki Kagaku, 23, 495(1974)).