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Intensified extraction of uranium(VI) in impinging-jets contactors

Tsaoulidis, D; Ortega, EG; Angeli, P; (2018) Intensified extraction of uranium(VI) in impinging-jets contactors. Chemical Engineering Journal , 342 pp. 251-259. 10.1016/j.cej.2018.02.049. Green open access

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Abstract

The mass transfer performance of confined impinging-jets (CIJs) contactors was investigated for metal separations. In particular, the extraction of uranium(VI) from aqueous nitric acid solutions (3 M) into 30% v/v TBP/Exxsol D80, relevant to spent nuclear fuel reprocessing, was studied for different cell geometries, i.e. main chamber size (D = 2 and 3.2 mm) and jet diameter (d j = 0.25 and 0.5 mm), and different operating conditions, i.e. residence time (τ = 1–9 s), total jet velocity (u tot = 2.6–8.6 m/s), and reactor length (L = 7–85 cm). For all conditions investigated, the aqueous phase was the dispersed one. Drop sizes were also measured with high-speed imaging. It was found that the extraction efficiency increased by increasing residence time for a constant total jet velocity regardless of the chamber size. At a constant residence time, higher extraction efficiency was achieved at high total jet velocities, which are associated with larger interfacial areas (smaller drops). The extraction efficiency reached 70% in most of the cases investigated in less than 2 s. In addition, high overall volumetric mass transfer coefficients (up to 1 s −1 ) were obtained at short residence times. Using regression analysis, a correlation for the overall volumetric mass transfer coefficient was developed from the experimental data with an average deviation of 9%.

Type: Article
Title: Intensified extraction of uranium(VI) in impinging-jets contactors
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.cej.2018.02.049
Publisher version: http://doi.org/10.1016/j.cej.2018.02.049
Language: English
Additional information: Copyright © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/).
Keywords: Extraction, Uranium, Confined impinging-jets, Mass transfer coefficients, Drop size
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10045354
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