Measurement and thermodynamic functions of solid–liquid phase equilibrium of d-(−)-quinic acid in H2O, methanol, ethanol and (H2O+methanol), (H2O+ethanol) binary solvent mixtures
| Autor: | Ma Shuang, Xinying Hao, Qiao Laicong, Qiang Huang, Mingjian Wu, Guopeng Shen |
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| Rok vydání: | 2016 |
| Předmět: |
Molar concentration
Atmospheric pressure Chemistry Enthalpy Thermodynamics 02 engineering and technology 010402 general chemistry 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Gibbs free energy Solvent chemistry.chemical_compound symbols.namesake 020401 chemical engineering symbols Non-random two-liquid model General Materials Science Methanol 0204 chemical engineering Physical and Theoretical Chemistry Solubility |
| Zdroj: | The Journal of Chemical Thermodynamics. 100:140-147 |
| ISSN: | 0021-9614 |
| DOI: | 10.1016/j.jct.2016.04.002 |
| Popis: | The solubility of d -(−)-quinic acid in H2O, methanol, ethanol and (H2O + methanol), (H2O + ethanol) binary solvent mixtures was measured at temperatures from (298.15 to 328.15 or 348.15) K by using the HPLC method under atmospheric pressure. The experimental values indicate that the solubility of d -(−)-quinic acid in the binary mixed solvents increases with the increasing temperature and decreases with the rise of molar concentration of organic solvents. The Apelblat model, λh model, Wilson model and NRTL model were used to correlate the experimental results and the relative average deviation (RAD) between the experimental and calculated values is less than 0.0358, 0.0421, 0.0359 and 0.0397 for the Apelblat model, λh model, Wilson model and NRTL model, respectively. Furthermore, thermodynamic properties of the solution process, including the Gibbs energy, enthalpy, and entropy were also calculated and analyzed. |
| Databáze: | OpenAIRE |
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