SPECTROSCOPIC STUDY OF THE EXTRACTION OF NICKEL BY 2-HYDROXY-5-NONYLBENZOPHENONE OXIME (LIX 65N) AND 5,8-DIETHYL-7-HYDROXYDODECANE-6-ONE OXIME (LIX 63). |
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Authors: | R P Sperline H Frelser |
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Affiliation: | Strategic Metals Recovery Research Facility, Department of Chemistry , University of Arizona , Tucson, Arizona, 85721 |
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Abstract: | ABSTRACT A novel method for determination of solvent extraction equilibria and kinetics using Infrared attenuated total reflectance spectroscopy (ATR) is described. The method allows complete, quantitative kinetic studies using a total of one gram of extractant. Solvent extraction of aqueous Ni2+ into 0.5 - 1.0 μm films of Apiezon M (ApM, aliphatic hydrocarbon) containing the title reagents was examined. In contrast with LIX 65N extraction which proceeds solely through the LIX 65N anion, extraction of Ni2+ by LIX 63 proceeds through both neutral and anionic forms of LIX 63. This results in a kinetic rate law having two terms, each exhibiting first order dependence on both Ni2+] and LIX 63]0. For mixtures of LIX 65N and LIX 63 (LIX 63:LIX 65N ≤ 0.12) In the ApH films, the rate law has only one term, of orders LIX 65N]0 1, LIX 63] 0 1, Ni2+]1, and H+]?1. While the equilibrium constants favor Ni(LIX 65N)2, the relatively large rate of reaction of the neutral LIX 63 leads to a catalysis of the overall LIX 65N extraction. |
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