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首页> 外文期刊>Journal of industrial and engineering chemistry >Separation of concentrated platinum(IV) and rhodium(III) in acidic chloride solution via liquid-liquid extraction using tri-octylamine
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Separation of concentrated platinum(IV) and rhodium(III) in acidic chloride solution via liquid-liquid extraction using tri-octylamine

机译：使用三辛胺液-液萃取分离酸性氯化物溶液中的浓铂（IV）和铑（III）

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摘要

This research dealt with the intensification of Pt-Rh separation via liquid-liquid extraction (LLE). The stock solution contained Pt(IV) and Rh(III) at high concentration level in hydrochloric solution: 625 ppm and 104 ppm, respectively. Tri-octylamine (TOA) in toluene was used as an extractant. For single stage extraction, the separation factor was 135 with 8 wt% TOA. The percentage of extraction was 97% for Pt(IV) and 21% for Rh(III). Soybean oil as a solvent in LLE provided good extraction performance comparable to that of toluene. Pt(IV) was almost completely removed from the organic phase when stripped by 8 M nitric acid. Multi-stage extraction with direct recycling of organic phase after stripping significantly decreased the separation factor to 13 during the 5th stage. When the organic phase was washed with 1 M NaOH prior to be used in the next extraction stage, the separation factor increased to 818 during the 5th stage. Finally, the Pt-Rh continuous separation process scheme is presented.
机译：这项研究涉及通过液-液萃取（LLE）强化Pt-Rh分离。储备溶液在盐酸溶液中分别含有高浓度水平的Pt（IV）和Rh（III）：分别为625 ppm和104 ppm。甲苯中的三辛胺（TOA）用作萃取剂。对于单级萃取，分离因子为135，TOA为8重量％。 Pt（IV）的萃取率为97％，Rh（III）的萃取率为21％。大豆油作为LLE中的溶剂，提供了与甲苯相当的良好萃取性能。当用8 M硝酸汽提时，Pt（IV）几乎从有机相中完全去除。汽提后直接回收有机相的多级萃取在第5阶段将分离系数显着降低至13。在将有机相用1 M NaOH洗涤之前，将其用于下一萃取阶段时，在第5阶段中，分离系数增加至818。最后提出了Pt-Rh连续分离工艺方案。

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