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Validity of the Simple Solution Concept for the Aqueous Quaternary System U(IV) Nitrate–U(VI) Nitrate–Nitric Acid–Water
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2020-03-16 , DOI: 10.1021/acs.jced.9b00933
Valentin Dru 1 , Gilles Bernier 1 , Solenne Michaud 1 , Philippe Marc 1 , Christian Sorel 1
Affiliation  

This work focuses on the validity of the simple solution concept of the uranium(IV) nitrate and uranium(VI) nitrate aqueous mixtures through different means such as water activity or density measurements using a simple solution approach. Since these two elements are mixed together in the plutonium uranium redox extraction (PUREX) process during the partitioning step, which separates uranium from plutonium, the knowledge of behavior of this mixture will help in the modeling of this process. This will allow a more precise code to be developed and thus better modeling of the different components involved in the PUREX process. Lately, thermodynamic codes are developed taking into account deviation from ideality. These deviations from ideality are estimated thanks to a solution theory. The one that will be used in this paper is the simple solution approach, a simplification of the McKay and Perring equation. The simple behavior of the uranium(IV) and uranium(VI) mixture will be checked using different methods. The precision of each method will then be discussed. This will be made through the acquisition of water activity, density, and molality of different solutions of uranium(IV) nitrate and uranium(VI) nitrate.

中文翻译:

季铵盐水溶液U(IV)-硝酸U(VI)-硝酸-水的简单解决方案概念的有效性

这项工作着眼于硝酸铀(IV)和硝酸铀(VI)水性混合物的简单溶液概念通过不同方法(例如使用简单溶液方法进行水活度或密度测量)的有效性。由于在分隔铀和,的分配步骤中,separate铀氧化还原萃取(PUREX)过程中将这两种元素混合在一起,因此了解这种混合物的行为将有助于对该过程进行建模。这将允许开发更精确的代码,从而更好地建模PUREX过程中涉及的不同组件。近来,考虑到与理想的偏差而开发了热力学代码。通过求解理论可以估算出这些与理想性的偏差。本文将使用的一种方法是简单的求解方法,即McKay和Perring方程的简化。铀(IV)和铀(VI)混合物的简单行为将使用不同的方法进行检查。然后将讨论每种方法的精度。这将通过获取硝酸铀(IV)和硝酸铀(VI)不同溶液的水活度,密度和摩尔浓度来实现。
更新日期:2020-04-24
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