Journal Article

FZJ-2019-03086

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Nitric Acid Extraction into a TODGA Solvent Modified with Octanol

Woodhead, D. ; McLachlan, F. ; Taylor, R. ; Müllich, U. ; Geist, A. (Corresponding author) ; Wilden, A.FZJ* ; Modolo, G.FZJ*

2019
Taylor & Francis Philadelphia, PA

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Please use a persistent id in citations: http://hdl.handle.net/2128/22490  doi:10.1080/07366299.2019.1625201

Abstract: Distribution data for the partition of nitric acid between nitric acid solution and a solventphase comprising various combinations of TODGA, octanol and inert kerosene diluent havebeen generated, covering a range of conditions from 0–9 mol/L HNO3(aq), 0–100% octanol,0–0.4 mol/L TODGA over a temperature range from 10–50 °C. The data have been used toderive a model describing the nitric acid equilibrium between the phases suitable forincorporation in process models of e.g. the innovative SANEX process. For the nitric acid /octanol / diluent system it was found that an accurate prediction of nitric acid distributioncould be achieved using a model allowing 1:1, 1:2 and 1:3 nitric acid / octanol adducts. Forthe nitric acid / TODGA / diluent system the best models were found to be those allowing4:1, 3:1, 2:1, 1:1 and 2:2 nitric acid / TODGA adducts. Superimposing the models for nitricacid distribution into the individual extractants and comparing with experimental results forthe nitric acid / octanol / TODGA system showed systematic differences indicative ofantagonistic and synergistic effects applying in the ranges 0.5–1.5 mol/L HNO3 and >1.5 mol/L HNO3 respectively. These effects were modelled by the inclusion of 0:1:2, 1:1:1,2:1:3 and 3:1:2 nitric acid / TODGA / octanol adducts. The effect of temperature on nitricacid extraction was well described by an Arrhenius type expression with an activation energyof −25.7 kJ/mol. No diluent dependence was found for nitric acid extraction.

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Contributing Institute(s):

1. Nukleare Entsorgung und Reaktorsicherheit (IEK-6)

Research Program(s):

1. 161 - Nuclear Waste Management (POF3-161) (POF3-161)
2. GENIORS - GEN IV Integrated Oxide fuels recycling strategies (755171) (755171)
3. SACSESS - Safety of ACtinide Separation proceSSes (323282) (323282)

Appears in the scientific report 2019

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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