Abstract
Equilibrium and rate of iron(III) extraction from chloride solutions by individual hydrophobic extractants and their mixtures The main goal of this work was to study and compare the rate of iron(III) extraction from chloride solutions by commercial extractants: Alamine 336, TOPO and LIX 54 and their mixtures. Using the interfacial tension data, obtained for mixed systems, the values of surface mole fraction and molecular interaction parameter of extractants were estimated. Determination of the extraction rates was performed by using the Lewis-type stirred transfer cell. It was found that the extraction efficiency of extractants are changed in the following order: Alamine 336>TOPO>β-diketone. The addition of a chelating extractant to the system decreases the extraction efficiency, for example the addition of β-diketone to TOPO decreases the extraction efficiency by about 50%.
Highlights
Iron is a naturally occurring element that enters the environment from industrial sources
The aim of this work was to investigate the rate of iron(III) extraction from chloride solutions by three commercial extractants: trioctylphosphine oxide (TOPO), Alamine 336 with trialkylamine (C8:C10=2:1) as an active substance and LIX 54 with 1-phenyldecane-1,3-dione as active substance and their mixtures
The high efficiency for iron(III) extraction of considered reagents was demonstrated by the extraction isotherms presented for 0.1 M solutions of TOPO and Alamine 336 in toluene
Summary
Iron is a naturally occurring element that enters the environment from industrial sources. Tributylphosphate (TBP)[1] and methyl iso-butyl ketone (MIBK)[2] have been used extensively for the extraction of iron(III) from hydrochloric acid solutions. Organophosphorus acid derivatives such as di-2-ethylhexylphosphoric acid (DEHPA)[3,4,5] or amines[6, 7] have been used. All these extractants have their own drawbacks: MIBK has a low flash point and high solubility in the aqueous phase; the use of TBP usually leads to the third phase formation; a high acid concentration is required to strip iron(III) from the acidic extractants such as DEHPA3. The development of new extraction systems for the extraction of iron(III) seems to be very important
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