Effect of composition and ageing of chloride solutions on extraction of Rh(III) and Ru(III) with phosphonium ionic liquids Cyphos IL 101 and IL 104

ABSTRACT

Rhodium(III) and ruthenium(III) were extracted from chloride solutions with phosphonium ionic liquids trihexyl(tetradecyl)phosphonium chloride or trihexyl(tetradecyl)phosphonium bis(2,4,4-trimethylpentyl)phosphinate in toluene. Influence of HCl and NaCl presence in the feed and IL concentration in the organic phase were determined. Rh(III) transport appeared to be inefficient, while over 70% of Ru(III) was extracted from 3 M HCl. Ru(III) extraction was affected by the feed acidity and the type of extractant used. The spectra of the extracts indicated some changes in the structure of Rh(III) and Ru(III) complexes in the organic phase. Also, ageing of feed solutions on the extraction of Ru(III) and Rh(III) was studied.

KEYWORDS:

• Chloro-complexes
• liquid–liquid extraction
• phosphonium ionic liquids
• rhodium(III)
• ruthenium(III)

Acknowledgments

The authors thank Dr. Anna Sobczyńska for her support in the calculations of distribution of chloro-complexes and Eng. Daria Rosińska for her help in the experiments with ruthenium(III).

Funding

The research work was supported through a grant by the Polish Ministry of Science and Higher Education, grant number 03/32/DS-PB/0701.

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Additional information

Funding

The research work was supported through a grant by the Polish Ministry of Science and Higher Education, grant number 03/32/DS-PB/0701.