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

Chihiro Tabata, Masahiko Nakase, Miki Harigai, Kenji Shirasaki, Ayaki Sunaga, Tomoo Yamamura

Research output: Contribution to journalArticlepeer-review

Abstract

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((Formula presented.), (Formula presented.) -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 (Formula presented.) -dodecane as a diluent. Distribution ratios have been studied as a function of aqueous HNO (Formula presented.) 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 (Formula presented.) -dodecane as diluent. In addition, the safety benefits of applying the nonflammable solvent HFC to the TRUEX process are also presented.

Original languageEnglish
JournalSeparation Science and Technology (Philadelphia)
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • nuclear fuel reprocessing
  • Solvent extraction
  • truex process

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Process Chemistry and Technology
  • Filtration and Separation

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