Effect of Temperature on the Extraction of Nitric Acid, Uranium and Fission Products with Tri-n-Octyl Amine

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With the aim of finding an optimum temperature in fuel reprocessing with alkylamine, the effect of temperature on the extraction of nitric acid, uranium, zirconium and ruthenium with tri-n-octyl amine was investigated in the temperature range between 20° and 60°. In the neutralization reaction for the extraction of nitric acid, R3N+H++NO3- ?? R3NHNO3, (1) the apparent equilibrium constants were determined for various temperatures. The average enthalpy change, average free energy change and average entropy change were found to be -16.3, -7.2 kcal/mol•deg and -8.0 e.u., respectively. For the association reaction of nitric acid, R3NHNO3+αHNO3 ?? R3NHNO3•αHNO3(2) the average apparent enthalpy change was found to be 3.4 kcal/mol•deg, which corresponds to hydrogen bond energy. The enthalpy change values were further determined for the extraction of uranium, zirconium and ruthenium, and found to be -1.3, 6.1 and 9.3 kcal/mol•deg. respectively. Within the temperature range studied, the lower regions of temperature appear to provide better separation of fission products from uranium and from plutonium.
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