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Zur Lösungsmittelextraktion des Rutheniums aus wäßrigen, chlor- und bromwasserstoffsauren Lösungen. I

Solvent extraction of ruthenium from aqueous hydrochloric and hydrobromic acid solutions. I

Extraktion mit Organophosphorverbindungen

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Zusammenfassung

Die verschiedenen Organophosphorverbindungen zeigen gegenüber Ruthenium(III)halogenkomplexen ein abgestuftes Extraktionsvermögen, wie dies auch gegenüber Osmiumhalogenkomplexen charakteristisch ist. Es gilt: Tripropylphosphat < Tributylphosphat < Tributylphosphit < Trioctylphosphinoxid mit in HBr höheren Verteilungskoeffizienten als in salzsauren Lösungen. Die praktisch erreichbaren Maximalwerte liegen mit Trioctylphosphinoxid bei P = 78%.

Aus der gemessenen Abhängigkeit der Verteilung von verschiedenen Parametern wie Säurekonzentration, Verdünnung u. a. wird ein der Osmiumextraktion entsprechender Extraktionsmechanismus abgeleitet und als Ursache der im Vergleich zum Osmium schlechteren Extrahierbarkeit der Rutheniumhalogenokomplexe die geringere Anlagerungsmöglichkeit der Organophosphormolekel diskutiert.

Summary

The various organophosphorus compounds exhibit a graded extraction capability toward ruthenium(III) halogen complexes such as is also characteristic of osmium halogen complexes. The order is: tripropyl phosphate < < tributyl phosphate < tributyl phosphite < trioctyl-phosphine oxide with higher distribution coefficients in HBr than in hydrochloric acid solutions. The practical attainable maximum values are atP = 78% in the case of trioctyl-phosphine oxide.

An extraction mechanism corresponding to the osmium extraction was derived from the measured dependence of the distribution of various parameters such as acid concentration, dilution etc. and also discussed as the reason for the poorer extractability of ruthenium halogen complexes in comparison with the osmium complexes on the basis of the lower addition possibility of the organophosphorus moleculc.

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Meier, H., Bösche, D., Zimmerhackl, E. et al. Zur Lösungsmittelextraktion des Rutheniums aus wäßrigen, chlor- und bromwasserstoffsauren Lösungen. I. Mikrochim Acta 57, 1083–1096 (1969). https://doi.org/10.1007/BF01219253

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  • DOI: https://doi.org/10.1007/BF01219253

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