Abstract
Data on the solubility of tetra-n-octyldiglycolamide (TODGA) in supercritical (SC) carbon dioxide at 310–360 K and 80–250 bar were obtained. The effect of the presence of an aqueous phase containing nitric acid on the solubility of TODGA in SC-CO2 was studied. It is shown that the equilibria in the TODGA–water–nitric acid–CO2 system depend in a complex way on the content of each component in it and on the state parameters. The regularities characteristic of the TODGA–SC-CO2 binary system cannot be transferred to the TODGA–water–nitric acid–CO2 four-component system as the presence of highly polar water and nitric acid in it has a critically strong effect on the transition of TODGA into the fluid phase, despite the very low solubility of these compounds in it.
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This work was financially supported by the Rosatom State Corporation.
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Kostenko, M.O., Parenago, O.O., Sinev, M.Y. et al. Equilibria in the Tetra-n-Octyldiglycolamide–Water–Nitric Acid–Carbon Dioxide System. Russ. J. Phys. Chem. B 17, 1423–1433 (2023). https://doi.org/10.1134/S1990793123070072
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DOI: https://doi.org/10.1134/S1990793123070072