Russian Journal of Physical Chemistry A

, Volume 92, Issue 5, pp 927–932 | Cite as

Thermodynamics of R-(+)-2-(4-Hydroxyphenoxy)propanoic Acid Dissolution in Methanol, Ethanol, and Methanol-Ethanol Mixture

  • Wei Liu
  • Jinju Ma
  • Xinding Yao
  • Ruina Fang
  • Liang Cheng
Physical Chemistry of Solutions


The solubilities of R-(+)-2-(4-hydroxyphenoxy)propanoic acid (D-HPPA) in methanol, ethanol and various methanol-ethanol mixtures are determined in the temperature range from 273.15 to 323.15 K at atmospheric pressure using a laser detecting system. The solubilities of D-HPPA increase with increasing mole fraction of ethanol in the methanol–ethanol mixtures. Experimental data were correlated with Buchowski-Ksiazczak λh equation and modified Apelblat equation; the first one gives better approximation for the experimental results. The enthalpy, entropy and Gibbs free energy of D-HPPA dissolution in methanol, ethanol and methanol-ethanol mixtures were also calculated from the solubility data.


R-(+)-2-(4-hydroxyphenoxy)propanoic acid solid-liquid equilibrium solubility dissolution enthalpy dissolution entropy dissolution Gibbs free energy 


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Copyright information

© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  • Wei Liu
    • 1
    • 3
  • Jinju Ma
    • 1
    • 3
  • Xinding Yao
    • 1
    • 3
  • Ruina Fang
    • 1
    • 3
  • Liang Cheng
    • 2
  1. 1.Environment and Chemistry Engineering DepartmentYellow River Conservancy Technical InstituteKaifengPR China
  2. 2.School of Chemical Engineering and EnergyZhengzhou UniversityZhengzhouPR China
  3. 3.Kaifeng Key Laboratory of Green Coating MaterialsKaifengPR China

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