Phase equilibria in the system nd³⁺–water–nitric acid—TODGA–CO₂ and the efficiency of supercritical fluid extraction of neodymium ions

2023, №3

сс. 69-83

Y.I. Zuev, M.O. Kostenko, M.Yu. Sinev, O.O. Parenago, V.B. Baranovskaya

Key words: extraction, neodymium, carbon dioxide, TODGA, nitric acid, phase equilibrium

Some equilibria in the system Nd³⁺ —water—nitric acid—TODGA—CO₂ (TODGA — N,N,N′,N′-tetraoctyl diglycolamide) and the efficiency of extraction of Nd³⁺ ions from aqueous solutions into the supercritical (SC) CO₂-based phase at 313—353 K and 180—400 bar were studied. It has been shown that in the absence of TODGA, the transfer of Nd3 ions to the SC-phase does not occur. The extraction efficiency increases with decreasing temperature and with increasing concentration of nitric acid (C_NA) in the aqueous solution. At 313 K, C_NA ≥ 1.5 mol/l, TODGA content not less than 100 mol/g-at. Nd and CO₂ pressure ensuring complete dissolution of TODGA (>19 MPa), a complete transfer of Nd³⁺ to the SC-phase is observed. As the content of neodymium ions in the system increases, the pressure and amount of CO2 required for complete dissolution of TODGA increases too. This is apparently due to a decrease in the intensity of intermolecular interactions in the SC-phase at increasing concentration in it of large and polar Nd complexes with TODGA and nitrate ions

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doi:10.34984/SCFTP.2023.18.3.006

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ГОСТ
7.0.100-2018

Зуев, Я.И. Phase equilibria in the system nd³⁺–water–nitric acid—TODGA–CO₂ and the efficiency of supercritical fluid extraction of neodymium ions / Я.И. Зуев, М.О. Костенко, М.Ю. Синёв [и др.]. – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2023. – Т. 18. – № 3. – С. 69-83. - DOI: 10.34984/SCFTP.2023.18.3.006

TRANSLIT

Zuev, Ya.I. Fazovye ravnovesiya v sisteme Nd³⁺—voda—azotnaya kislota—TODGA—SO₂ i effektivnost' sverhkriticheskoj flyuidnoj ekstrakcii ionov neodima / Ya.I. Zuev, M.O. Kostenko, M.Yu. Sinyov [i dr.]. – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2023. – Т. 18. – № 3. – S. 69-83. - DOI: 10.34984/SCFTP.2023.18.3.006

Y.I. Zuev, M.O. Kostenko, M.Yu. Sinev, O.O. Parenago, V.B. Baranovskaya Phase equilibria in the system nd³⁺–water–nitric acid—TODGA–CO₂ and the efficiency of supercritical fluid extraction of neodymium ions. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 3, 69-83 (2023). https://doi.org/10.34984/SCFTP.2023.18.3.006

Phase equilibria in the system nd3+–water–nitric acid—TODGA–CO2 and the efficiency of supercritical fluid extraction of neodymium ions

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Phase equilibria in the system nd³⁺–water–nitric acid—TODGA–CO₂ and the efficiency of supercritical fluid extraction of neodymium ions