Perform Thermodynamics Measurements on Fuel Cycle Case Study Systems

Leigh R. Martin

关键词: Actinide Extraction;    ALSEP Process;    Thermodynamics;    TODGA/HEH[EHP] extraction;   

DOI  :  10.2172/1173083
RP-ID  :  INL/EXT-14-33295
PID  :  OSTI ID: 1173083

学科分类：核能源与工程

美国|英语

来源: SciTech Connect

【 摘 要 】

This document was prepared to meet FCR&D level 3 milestone M3FT-14IN0304022, ???Perform Thermodynamics Measurements on Fuel Cycle Case Study Systems.??? This work was carried out under the auspices of the Thermodynamics and Kinetics FCR&D work package. This document reports preliminary work in support of determining the thermodynamic parameters for the ALSEP process. The ALSEP process is a mixed extractant system comprised of a cation exchanger 2-ethylhexyl-phosphonic acid mono-2-ethylhexyl ester (HEH[EHP]) and a neutral solvating extractant N,N,N???,N???-tetraoctyldiglycolamide (TODGA). The extractant combination produces complex organic phase chemistry that is challenging for traditional measurement techniques. To neutralize the complexity, temperature dependent solvent extraction experiments were conducted with neat TODGA and scaled down concentrations of the ALSEP formulation to determine the enthalpies of extraction for the two conditions. A full set of thermodynamic data for Eu, Am, and Cm extraction by TODGA from 3.0 M HNO3 is reported. These data are compared to previous extraction results from a 1.0 M HNO3 aqueous medium, and a short discussion of the mixed HEH[EHP]/TODGA system results is offered.