Standard enthalpies of formation of 3-hydroxyphthalic anhydride

• DOI: 10.31349/revmexfis.68.061701
• Publication Date: 2022-11-02T04:36:25Z
• Authors: M. López-Ortega; Miguel Angel Garc...; J. A. Galicia-Agu...; R.J. Aranda-García; H.S. Ramos-Hernández; F. Díaz-Sánchez
• Keywords: Enthalpy of atomization; Sublimation; Enthalpy of sublimation; Thermogravimetric analysis

In this investigation thermochemical properties of 3-hydroxyphthalic anhydride were determined. Fusion enthalpy, fusion temperature and molar heat capacity in solid phase obtained by differential scanning calorimetry. By the Knudsen effusion method, enthalpy sublimation at 298.15 K was obtained. thermogravimetric data, it possible to determine vaporization. On other hand, formation determined combustion The gas calculated from K. This experimental value compared both theoretical using Gaussian methods G3 G4 levels with an estimated relation phthalic anhydride.