Solvent extraction using Di(2-ethylhexyl) phosphoric acid (HDEHP) is an effective separation technique for  the purification of various metals, including the extraction and/or partitioning of lanthanides and actinides. Successful separation of these two groups of elements could minimize the volume of nuclear waste requiring long-term storage. Accurately modeling the process for industrial use requires a thorough understanding of the solution chemistry of the system. However, the majority of research characterizing the behavior of HDEHP relies on extraction data, rather than data from a binary HDEHP/solvent system. An improved understanding of HDEHP in the simpler, more fundamental system will either elucidate effects that the extraction studies overlook or independently support their results. With this motivation, we present and discuss the results of our study examining the role of temperature and concentration on the non-ideal behavior of the binary HDEHP and n-dodecane system based on data from vapor pressure osmometry.

Characterizing the self-association and activities of  di(2-ethylhexyl) phosphoric acid  in n-dodecane using  vapor pressure osmometry

241st National Meeting (2011)

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