Solid–Liquid Equilibria of KCl in Polyethylene Glycol 6000–H₂O Mixed Solvent at 288.2, 298.2, and 308.2 K : Experiment and Correlation

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  • Yu Xudong
    MNR Key Laboratory of Saline Lake Resources and Environments, Institute of Mineral Resources, CAGS College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology
  • Huang Qin
    College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology
  • Zheng Miangping
    MNR Key Laboratory of Saline Lake Resources and Environments, Institute of Mineral Resources, CAGS
  • Wang Lin
    College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology
  • Li Maolan
    College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology

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  • Solid–Liquid Equilibria of KCl in Polyethylene Glycol 6000–H<sub>2</sub>O Mixed Solvent at 288.2, 298.2, and 308.2 K: Experiment and Correlation

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<p>The present study investigates the measurement of the phase equilibria of ternary systems KCl–PEG6000(PEG with molecular weight 6000)–H2O at 288.2, 298.2 and 308.2 K. All the experimental data concluding the solubility of KCl in PEG6000–H2O mixed solvents, corresponding density, and refractive index were determined. According to the results, the phase diagrams at 288.2, 298.2, and 308.2 K are divided into the three parts of regions: unsaturated homogeneous liquid (L), one liquid and one solid KCl (L+S), one liquid and two solids KCl and PEG6000 (L+2S); the area of (L+2S) decreases with an increase of temperature, while the areas of (L) and (L+S) increase with an increase of temperature. With an increment of PEG6000 in mixed solvents, the solubilities of KCl and the density decreased; inversely, the refractive index increased at three temperatures. Comparing the diagrams of KCl–PEG1000/4000/6000–H2O at 288.2, 298.2, and 308.2 K, the sizes of regions of (L) and (L+S) decreased and that of (L+2S) increased with the increase of the molecular weight of PEG. A modified Pitzer model and Pitzer activity coefficient model were applied to simulate the equilibrium thermodynamics of the KCl–PEG6000–H2O system at 288.2, 298.2, and 308.2 K. Comparing the experimental data and calculated dada, the thermodynamic models can give precise results with little error.</p>

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