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Solid–Liquid Phase Equilibria of the KH2PO4–KCl–H3PO4–H2O and KH2PO4–KCl–C2H5OH–H2O Systems at T = (298.15 and 313.15) K

  • Jing Cao
    Jing Cao
    State Key Laboratory of High-Efficiency Coal Utilization and Green Chemical Engineering, School of Chemistry & Chemical Engineering, Ningxia University, Yinchuan 750021, P. R. China
    More by Jing Cao
  • Yongsheng Ren*
    Yongsheng Ren
    State Key Laboratory of High-Efficiency Coal Utilization and Green Chemical Engineering, School of Chemistry & Chemical Engineering, Ningxia University, Yinchuan 750021, P. R. China
    *E-mail: [email protected], [email protected] (Y. Ren).
  • , and 
  • Jiamin Liu
    Jiamin Liu
    State Key Laboratory of High-Efficiency Coal Utilization and Green Chemical Engineering, School of Chemistry & Chemical Engineering, Ningxia University, Yinchuan 750021, P. R. China
    More by Jiamin Liu
Cite this: J. Chem. Eng. Data 2018, 63, 6, 2065–2074
Publication Date (Web):May 29, 2018
https://doi.org/10.1021/acs.jced.8b00081
Copyright © 2018 American Chemical Society

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    Abstract

    Abstract Image

    Solid–liquid phase equilibrium and physical properties of KH2PO4 in the mixture solution at 298.15 and 313.15 K were determined by an isothermal solution saturation method and moist residues. According to the experimental data, the solubility curves and physical parameter (μ, ρ) curves of KH2PO4–KCl–H3PO4–H2O systems were plotted. In a mixture solution of KCl and H3PO4, the solubility of KH2PO4 increased with the increasing concentration of H3PO4 and decreased with the increaing solubility of KCl because of the same ion effect. For the system of KH2PO4–KCl–C2H5OH–H2O at 298.15K, corresponding phase diagrams and diagrams of physical properties were plotted on the basis of the experimental data, and the initial mass fraction of ethanol was 10%, 30%, and 50% in the salt-free binary solvent water + ethanol. In the phase diagrams, there are one invariant point, two univariant curves, and two crystallization regions corresponding to KCl and KH2PO4. In addition, the crystallization region of KH2PO4 is larger than that of KCl, and the two crystallization regions become smaller as the mass fraction of water + ethanol mixture solvent increased. The physical properties of the system KH2PO4–KCl–C2H5OH–H2O changed regularly with the concentration change of the liquid phase. The equilibrium solids were verified by X-ray diffraction. The measured data and physical property diagrams for the investigated systems can provide the fundamental basis for the industrial production of KH2PO4 by the solvent extraction method.

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    Cited By

    This article is cited by 7 publications.

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