Synergistic Extraction of Rhodium(III) from Hydrochloric Acid Solution with Tri-n-octylamine and Sulfide-type Extractants

Synergistic extraction of Rh(III) from relatively concentrated HCl solution was studied using two mixed solvents (di-n-hexyl sulfide (DHS)-tri-n-octylamine (TOA) and N,N′-dimethyl-N,N′-di-n-octyl-thiodiglycolamide (TDGA)-TOA) in chloroform. The Rh(III) extraction efficiency is poor when 0.5 M TOA, D...

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Bibliographic Details
Published inSolvent extraction and ion exchange Vol. 33; no. 5; pp. 462 - 471
Main Authors Narita, Hirokazu, Morisaku, Kazuko, Tanaka, Mikiya
Format Journal Article
LanguageEnglish
Published Taylor & Francis 29.07.2015
Subjects
di-n-hexyl sulfide
rhodium
synergistic effect
thiodiglycolamide
tri-n-octylamine
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Summary:Synergistic extraction of Rh(III) from relatively concentrated HCl solution was studied using two mixed solvents (di-n-hexyl sulfide (DHS)-tri-n-octylamine (TOA) and N,N′-dimethyl-N,N′-di-n-octyl-thiodiglycolamide (TDGA)-TOA) in chloroform. The Rh(III) extraction efficiency is poor when 0.5 M TOA, DHS, or TDGA is used independently. In contrast, the 0.5 M TDGA-0.5 M TOA and 0.5 M DHS-0.5 M TOA mixed solvents extract ˜90% and ˜70% of Rh(III), respectively, at maximum. Slope analyses and Job's plots for the distribution ratios of Rh(III) at 2 M HCl show that the apparent stoichiometry of Rh(III):TOA:(DHS or TDGA) in the extracted complex is 1:2:1.
ISSN:0736-6299
1532-2262
DOI:10.1080/07366299.2015.1039834