Hydrofluorocarbon Diluent for CMPO Without Third Phase Formation: Extraction of Uranium(VI) and Lanthanide(III) Ions

Hydrofluorocarbon Diluent for CMPO Without Third Phase Formation: Extraction of Uranium(VI) and Lanthanide(III) Ions
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用于不形成第三相的 CMPO 的氢氟碳稀释剂:铀 (VI) 和镧系 (III) 离子的萃取

DOI:
10.1080/01496395.2021.1970767
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发表时间:
2021
影响因子:
2.8
通讯作者:
Yamamura Tomoo
Yamamura Tomoo
中科院分区:
工程技术4区
文献类型:
--
作者:
Tabata Chihiro;Nakase Masahiko;Harigai Miki;Shirasaki Kenji;Sunaga Ayaki;Yamamura Tomoo

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研究了在硝酸介质中,以HFC-43(1,1,1,2,2,3,4,5,5,5-十氟戊烷)为稀释剂,辛基苯基(,-二异丁基氨甲酰基甲基)氧化膦(CMPO)对La,Ce,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Er,Tm,Yb,Lu等三价镧系元素和铀的萃取行为。据透露,HFC-43表现出高溶解度的CMPO,即使在没有磷酸三丁酯(TBP),这通常是必要的,以防止在常规的TRUEX过程中使用-十二烷作为稀释剂的第三相的形成。分配比已被研究作为一个功能的水HNO浓度,CMPO浓度,和离子半径的镧系元素(III)离子。基于斜率分析检查了提取的配位配合物的化学计量,确定两到三个CMPO分子与一个镧系元素或铀离子配位。该方法的可行性表明分配比,这是可比的常规系统使用十二烷作为稀释剂。此外,还介绍了将不易燃溶剂HFC应用于TRUEX工艺的安全效益。
The extraction behaviors of trivalent lanthanides (La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu) and hexavalent uranium with octylphenyl(,-diisobutylcarbamoylmethyl)phosphine oxide (CMPO) from a nitric acid medium were studied using hydrofluorocarbon (1,1,1,2,2,3,4,5,5,5- decafluoropentane: HFC-43) as a nonflammable diluent. It was revealed that HFC-43 exhibits high solubility of CMPO even in the absence of tributylphosphate (TBP), which has typically been necessary to prevent third-phase formation in the conventional TRUEX process using-dodecane as a diluent. Distribution ratios have been studied as a function of aqueous HNOconcentrations, CMPO concentrations, and ionic radii of lanthanide(III) ions. The stoichiometry of the extracted coordination complex was examined based on the slope analysis, and it was determined that two to three CMPO molecules are coordinated to one lanthanide or uranium ion. The feasibility of the process is indicated by the distribution ratio, which is comparable to the conventional system using-dodecane as diluent. In addition, the safety benefits of applying the nonflammable solvent HFC to the TRUEX process are also presented.
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