Measurement and model of density, viscosity, and hydrogen sulfide solubility in ferric chloride/trioctylmethylammonium chloride ionic liquid

doi:10.1016/j.cjche.2022.11.012

Abstract

Abstract: The density and viscosity of ferric chloride/trioctylmethylammonium chloride ionic liquid (rFeCl₃/[A336]Cl) with different molar ratios (r = 0.1-0.8) of FeCl₃ to [A336]Cl were measured at temperatures from 313.15 to 358.15 K and atmospheric pressure. The density and viscosity data were fitted by the relevant temperature variation equations, respectively. The variation of density and viscosity with temperature and r was obtained. The solubility of rFeCl₃/[A336]Cl to H₂S was measured at temperatures from 318.15 to 348.15 K and pressures from 0 to 150 kPa. The effects of temperature, pressure, and r on the solubility of H₂S were discussed. The reaction equilibrium thermodynamic model (RETM) was used to fit the H₂S solubility data, and the average relative error was less than 1.3%, indicating that the model can relate the solubility data well. And Henry's constant and chemical reaction equilibrium constant were obtained by the RETM fitting. The relationships of Henry's constant and chemical reaction equilibrium constant with temperature and r were analyzed.

Key words: Ionic liquids, Hydrogen sulfide, Solubility, Henry's constant, Chemical reaction equilibrium constant, Model

摘要： The density and viscosity of ferric chloride/trioctylmethylammonium chloride ionic liquid (rFeCl₃/[A336]Cl) with different molar ratios (r = 0.1-0.8) of FeCl₃ to [A336]Cl were measured at temperatures from 313.15 to 358.15 K and atmospheric pressure. The density and viscosity data were fitted by the relevant temperature variation equations, respectively. The variation of density and viscosity with temperature and r was obtained. The solubility of rFeCl₃/[A336]Cl to H₂S was measured at temperatures from 318.15 to 348.15 K and pressures from 0 to 150 kPa. The effects of temperature, pressure, and r on the solubility of H₂S were discussed. The reaction equilibrium thermodynamic model (RETM) was used to fit the H₂S solubility data, and the average relative error was less than 1.3%, indicating that the model can relate the solubility data well. And Henry's constant and chemical reaction equilibrium constant were obtained by the RETM fitting. The relationships of Henry's constant and chemical reaction equilibrium constant with temperature and r were analyzed.

关键词: Ionic liquids, Hydrogen sulfide, Solubility, Henry's constant, Chemical reaction equilibrium constant, Model

Zhonghao Li, Yuanyuan Yang, Huanong Cheng, Yun Teng, Chao Li, Kangkang Li, Zhou Feng, Hongwei Jin, Xinshun Tan, Shiqing Zheng. Measurement and model of density, viscosity, and hydrogen sulfide solubility in ferric chloride/trioctylmethylammonium chloride ionic liquid[J]. Chinese Journal of Chemical Engineering, 2023, 59(7): 210-221.

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