The technique of vapor pressure osmometry is utilized to revisit organic phase activity coefficients to help ensure accurate treatment of the non-ideal affects in modeling of separations for nuclear fuel reprocessing, and to further elucidate the impact of the solvent. Here, we present and analyzes our osmometry results for di(2-ethylhexyl) phosphoric acid, (HDEHP), an industrial extractant that can be used in the separation of lanthanides from actinides. This study examines several solvents, including the commonly studied dodecane and toluene, allowing comparison with with prior studies that used the alternative technique of slope analysis of metal extractions to correct for non-ideal interactions of HDEHP in the organic solvent. Our work will help reveal effects overlooked by those extractions studies or independently confirm their results.

Vapor pressure osmometry determination of select organic phase activity coefficients applicable to spent nuclear fuel reprocessing

243rd National Meeting (2012)

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