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

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- decafluorop...

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Bibliographic Details
Published in:Separation science and technology 2022-05, Vol.57 (7), p.1097-1110
Main Authors: Tabata, Chihiro, Nakase, Masahiko, Harigai, Miki, Shirasaki, Kenji, Sunaga, Ayaki, Yamamura, Tomoo
Format: Article
Language:English
Subjects:
Coordination compounds
Distribution
Dodecane
Erbium
Feasibility studies
Gadolinium
Hydrofluorocarbons
Ions
Lanthanides
Nitric acid
Nitric acids
nuclear fuel reprocessing
Phosphine
Phosphine oxide
Samarium
Solvent extraction
Stoichiometry
Tributylphosphate
truex process
Uranium
Ytterbium
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Summary: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 HNO concentrations, 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.
ISSN:0149-6395
1520-5754
DOI:10.1080/01496395.2021.1970767