Extraction kinetics of iron(III) from aqueous nitrate solutions to toluene solutions of tri-n-butylacetohydroxamic acid |
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| Affiliation: | 1. Biofuels and Bioprocessing Research Center, Institute of Technical Education and Research, Siksha ‘O’ Anusandhan [Deemed to be University], Bhubaneswar 751030, India;2. Department of Chemistry, Institute of Technical Education and Research, Siksha ‘O’ Anusandhan [Deemed to be University], Bhubaneswar 751030, India;1. TU Bergakademie Freiberg, Institute of Chemical Technology, Leipziger Straße 29, 09599 Freiberg, Germany;2. University for Continuing Education Krems, Td Lab Sustainable Mineral Resources, Dr.-Karl-Dorrek-Straße 30, 3500 Krems, Austria;3. Fraunhofer Institute for Ceramic Technologies and Systems IKTS, Fraunhofer Technology Center for High-Performance Materials THM, Am St.-Niclas-Schacht 13, 09599 Freiberg, Germany |
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| Abstract: | The forward and reverse extraction rate of Fe3+ at time zero between aqueous nitrate solutions and toluene solutions of tri-n-butylacetohydroxamic acid, HX, has been studied as function of the composition of the system and the stirring speed of the two phases. Experimental information has been also obtained on the degree of aggregation of HX, its surface active properties, its solubility in the aqueous phase as well as on the equilibrium distribution of Fe(III). Rate equations have been derived. The rate determining step of the extraction reaction has been shown to be the reaction of the free and hydrolyzed iron ions, Fe3+ (hydrated) and FeOH+ (hydrated), with the HX undissociated molecules. The reactions occur simultaneously in the aqueous phase (homogeneous path) and at the interface (heterogeneous path). A correlation between the rate constants and the equilibrium constant of the extraction reaction of Fe(III) has been established. |
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