Decomposition Studies of Aqueous Phase Ligands Used in Advanced Reprocessing Flowsheets

Stacey Reilly , Chris Maher , Steven Brewer , Robin Taylor
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引用次数: 2

Abstract

Two potential methods for decomposing organic ligands in nitric acid have been studied using acetic acid and diethylenetriaminepentaacetic acid (DTPA) as examples; these methods were oxidation by nitric acid at elevated temperatures (70-110 °C) and electrochemical oxidation, both direct and mediated electrochemical oxidation. Based on total carbon measurements, acetic acid proved to be rather stable against nitric acid oxidation whereas 60-80% of DTPA was decomposed at 100-110°C. Electrochemical oxidation methods were generally more effective in decomposing acetic acid and DTPA with mediated electrochemical oxidation using Ag(II) ions the most effective method under the conditions tested, with ∼80 and >90% loss of carbon from acetic acid and DTPA solutions respectively, at ambient temperature in 6 M HNO3.

先进后处理流程中水相配体的分解研究
以乙酸和二乙烯三胺五乙酸(DTPA)为例,研究了有机配体在硝酸中分解的两种可能的方法;这些方法包括高温(70-110℃)硝酸氧化和电化学氧化,包括直接和间接电化学氧化。根据总碳测量,醋酸对硝酸氧化相当稳定,而60-80%的DTPA在100-110℃下分解。电化学氧化法在分解乙酸和DTPA方面通常更有效,在6 M HNO3的环境温度下,Ag(II)离子介导的电化学氧化是测试条件下最有效的方法,乙酸和DTPA溶液的碳分别损失约80%和90%。
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