A study of cerium extraction by TBP and TODGA using a rotating diffusion cell

Abstract

Abstract. For the study of the coupled interfacial-mass transfer kinetics of, inter alia, TBP, TODGA, CyMe 4 -BTBP and CyMe 4 -BTPhen based solvent extraction processes, a new rotating diffusion cell (RDC) apparatus has been established at Lancaster University. RDC studies of Ce(IV)/TBP and Ce(III)/TODGA extraction systems have been undertaken in order to improve the understanding of the chemical and kinetic processes involved. In each case, an interesting dependency on local hydrodynamics at the solution phase boundary with results suggesting that the organic extractant molecules migrate into the aqueous phase in order to capture Ce.

Influence of Light and Temperature on the Extractability of Cerium(IV) as a Surrogate of Plutonium(IV) and its Effect on the Simulation of an Accidental Fire in the PUREX Process

“…The absorbance of the yellow complex was followed at a constant temperature in the dark at 325 nm (ε = 3930 L mol –1 cm –1 ). The wavelength is in good agreement with that in Bromley and Boxall studies …”

“…The wavelength is in good agreement with that in Bromley and Boxall studies. 46 Infrared Spectroscopy. Infrared spectra (see Supporting Information) were measured on a PerkinElmer Spectrum Two spectrometer between 4000 and 400 cm −1 , equipped with a diamond attenuated total reflectance accessory.…”

The Effects of Nitric Acid on Extraction Properties of TODGA During Fission Product Management

“…Through use of this technique, we have quantified the interfacial kinetics of the extraction of Ce(III) by TODGA [4] and have identified that the key complexation reaction takes place in the aqueous solution phase [5]. Further observations have shown the rate of Ce extraction to have linear dependence on the aqueous concentrations of both Ce(III) and HNO3 (not shown), indicating that the extraction process occurs with the inclusion of a single nitrate ion in the first coordination sphere of the Ce(III)-TODGA complex; and, through variation of both hydrodynamic conditions and key solution concentrations, that the system operates under mixed mass transfer with chemical reaction (MTWCR) control [6].…”