Solvent Extraction and Ion Exchange ( IF 2 ) Pub Date : 2020-07-21 , DOI: 10.1080/07366299.2020.1794523 Andreas Geist 1 , Laurence Berthon 2 , Marie-Christine Charbonnel 2 , Udo Müllich 1
ABSTRACT
Liquid-liquid distribution data were determined for the extraction of nitric acid, Am(III), Cm(III), and lanthanides(III) from 0.1–7 mol/L nitric acid into 0.5–1 mol/L N,N’-dimethyl-N,N’-dioctyl-2-[2-(hexyloxy)ethyl]-malonamide (DMDOHEMA) dissolved in kerosene. Nitric acid extraction was accurately modeled accounting for the adducts (HNO3)L2, (HNO3)L, and (HNO3)2L. To model Am(III) extraction, the following complexes were taken into account, Am(NO3)3L4, Am(NO3)3(HNO3)L3, and a third complex, Am(NO3)3(HNO3)2 L3 (considering spectroscopic results) or Am(NO3)3(HNO3)2 L2 (considering slope-analysis results). Separation factors for Am(III) over Cm(III) and the lighter lanthanides(III) are practically independent of nitric acid concentration. Am(III)/Ln(III) separation factors decrease with increasing nitric acid concentration for the heavier lanthanides(III).
中文翻译:
将硝酸,A(III),Cur(III)和镧系元素(III)萃取到溶于煤油的DMDOHEMA中
摘要
确定了从0.1–7 mol / L硝酸到0.5–1 mol / L N,N'-中的硝酸,Am(III),Cm(III)和镧系元素(III)的萃取液-液分布数据。溶解在煤油中的二甲基-N,N'-二辛基-2- [2-(己氧基)乙基]-丙二酰胺(DMDOHEMA)。准确地模拟了硝酸萃取物中加合物(HNO 3)L 2,(HNO 3)L和(HNO 3)2 L的建模。为模拟Am(III)萃取,考虑了以下配合物Am(NO 3)3 L 4,Am(NO 3)3(HNO 3)L 3以及第三配合物Am(NO 3)3(HNO 3)2 L 3 (考虑光谱结果)或Am(NO 3)3(HNO 3)2 L 2 (考虑斜率分析结果)。Am(III)与Cm(III)和较轻的镧系元素(III)的分离系数实际上与硝酸浓度无关。对于较重的镧系元素(III),Am(III)/ Ln(III)分离因子随硝酸浓度的增加而降低。