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Abstract <p>The section of the phase diagram of the Mn(CH<sub>3</sub>SO<sub>3</sub>)<sub>2</sub>–CH<sub>3</sub>SO<sub>3</sub>H–H<sub>2</sub>O system at 298.15 K was obtained by the isothermal solubility method. It was shown that the dihydrate Mn(CH<sub>3</sub>SO<sub>3</sub>)<sub>2</sub>⋅2H<sub>2</sub>O is in equilibrium with solutions containing 0–58 wt&#xa0;% acid. The bulk properties of solutions were obtained for a number of compositions at 298.15 K for this ternary system and in the temperature range 288.15–323.15 K for its subsystem Mn(CH<sub>3</sub>SO<sub>3</sub>)<sub>2</sub>–H<sub>2</sub>O. The bulk properties are described using the Laliberté semi-empirical approach. Based on the results of the saturated vapor pressure measurement by the static method, the water activity was calculated in the temperature range of 288.15–323.15 K. The possibility of estimating the solubility and water activity using only the binary parameters of the Pitzer–Simonson–Clegg model for the liquid phase and the known solubility constant at 298.15 K was tested for the Mn(CH<sub>3</sub>SO<sub>3</sub>)<sub>2</sub>–CH<sub>3</sub>SO<sub>3</sub>H–H<sub>2</sub>O system. It is shown that using the binary parameters alone is not enough for adequate prediction of solubility; at least one parameter of the ternary interaction must be taken into account.</p>

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Phase Equilibria and Thermodynamic Properties of Phases in the Manganese Methanesulfonate–Methanesulfonic Acid–Water System: Experiment and Calculation

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • E. V. Belova,
  • A. S. Kapelyushnikov,
  • I. A. Uspenskaya

摘要

Abstract

The section of the phase diagram of the Mn(CH3SO3)2–CH3SO3H–H2O system at 298.15 K was obtained by the isothermal solubility method. It was shown that the dihydrate Mn(CH3SO3)2⋅2H2O is in equilibrium with solutions containing 0–58 wt % acid. The bulk properties of solutions were obtained for a number of compositions at 298.15 K for this ternary system and in the temperature range 288.15–323.15 K for its subsystem Mn(CH3SO3)2–H2O. The bulk properties are described using the Laliberté semi-empirical approach. Based on the results of the saturated vapor pressure measurement by the static method, the water activity was calculated in the temperature range of 288.15–323.15 K. The possibility of estimating the solubility and water activity using only the binary parameters of the Pitzer–Simonson–Clegg model for the liquid phase and the known solubility constant at 298.15 K was tested for the Mn(CH3SO3)2–CH3SO3H–H2O system. It is shown that using the binary parameters alone is not enough for adequate prediction of solubility; at least one parameter of the ternary interaction must be taken into account.