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Effect of electrolyte additions and temperature on the structure self-organization of the water subsystem in water-supercritical Co2-NaCl ternary mixtures

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Abstract

The effect of electrolyte additions (6, 15, 23 wt % NaCl) and temperature (T 313–633 K, p 250 bar) on the structural state of the water subsystem in the water-rich phase of the water-supercritical CO2-NaCl ternary system was studied by IR spectroscopy and the method of integral equations. With increasing salt concentration, the breaking effect of temperature on the structure of the water subsystem becomes weaker, and the fractions of H-bonded water n-mers are redistributed. In systems with a nonzero NaCl concentration, tetramers exist throughout the examined temperature range, and trimers become the main structural unit of the water subsystem at temperatures close to the critical point. The prevalent structural components of the system with 0 wt % NaCl near the critical point are dimers. The O⋯H bonds between water molecules and Cl⋯H bonds in the nearest surroundings of the anions make approximately equal contributions to the overall pattern of H bonds in the water subsystem.

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Authors and Affiliations

  1. Institute of Solution Chemistry, Russian Academy of Sciences, Ivanovo, Russia

    R. D. Oparin & M. V. Fedotova

  2. Ivanovo State University, ul. Akademicheskaya 1, Ivanovo, 153045, Russia

    M. V. Fedotova

Authors
  1. R. D. Oparin
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  2. M. V. Fedotova
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Correspondence to R. D. Oparin.

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Original Russian Text © R.D. Oparin, M.V. Fedotova, 2007, published in Zhurnal Obshchei Khimii, 2007, Vol. 77, No. 10, pp. 1618–1632.

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Oparin, R.D., Fedotova, M.V. Effect of electrolyte additions and temperature on the structure self-organization of the water subsystem in water-supercritical Co2-NaCl ternary mixtures. Russ J Gen Chem 77, 1686–1699 (2007). https://doi.org/10.1134/S1070363207100064

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