Abstract
The solubility of R-2[4-(6-chloro-2-benzoxazolyloxy)phenoxy]propanoic acid (abbreviated as Fenoxaprop-P) in methanol, ethanol and various methanol-ethanol mixed solvents have been experimentally measured in the temperature range from 273.15 to 323.15 K at atmospheric pressure using a laser monitoring observation technique. The experimental solubility of Fenoxaprop-P increases with increasing mole fraction of ethanol in the methanol–ethanol mixtures, which were analyzed by the solubility parameter. Experimental data were correlated with Buchowski–Ksiazczak λh equation and modified Apelblat equation. Computational results showed the Buchowski–Ksiazczak λh equation can fit the solubility data well. The dissolution enthalpy, entropy and Gibbs free energy of Fenoxaprop-P in methanol, ethanol and methanol-ethanol mixtures were also predicted by the Van’t Hoff and the Gibbs equation.
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