Extraction Behaviour of Cyanex-923 and Cyanex-471X Towards the Rhodium(III) from Bromide Media and Its Separation from other Platinum Metals

The extraction of Rh(III) from bromide media with Cyanex‐923 and Cyanex‐471X in toluene was studied. The quantitative extraction of Rh(III) with extractants was found by studying the different parameters like, hydrobromic acid concentration, extractant concentration, diluents and effect of temperatu...

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Veröffentlicht in:Journal of the Chinese Chemical Society (Taipei) 2002-04, Vol.49 (2), p.165-172
Hauptverfasser: Duche, S. N., Chavan, D. V., Dhadke, P. M.
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Sprache:eng
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Zusammenfassung:The extraction of Rh(III) from bromide media with Cyanex‐923 and Cyanex‐471X in toluene was studied. The quantitative extraction of Rh(III) with extractants was found by studying the different parameters like, hydrobromic acid concentration, extractant concentration, diluents and effect of temperature on extraction. The optimum condition was [HBr] = 1.0–1.5 moll−1, [SnCl2] = 0.2 moll−1 with [Cyanex‐923] = 0.15 moll−1, while it was [HBr] = 1.5–2.0 moll−1, [SnCl2] = 0.4 moll−1 with [Cyanex‐471X] = 0.8 moll−1 in toluene. The quantitative extraction was observed only in the presence of SnCl2 for both extractants. The complete recovery of Rh(III) from the Cyanex‐923 extracted organic phase was observed with the 1:1 mixture of (4.0 moll−1 HCl + 2.0 moll−1 HNO3), and that with the Cyanex‐471X extracted organic phase was found with 1:1 mixture of (2.0 moll−1 H2SO4 + 1.0 moll−1 KMnO4). Stoichiometric ratio of Rh(III) with both extractants was 1:1. The proposed methods were employed for extraction and separation of Rh(III) from other platinum metal ions and also for recovery of Rh(III) from a synthetic solution of spent autocatalysts.
ISSN:0009-4536
2192-6549
DOI:10.1002/jccs.200200026