Volatility and thermodynamic stability of vanillin

• Tipo: Artigo em Revista Científica Internacional
• Data: 2019

Autores

Almeida, ARRP (Autor) FCUP; Vera L S Freitas (Autor) FCUP; Campos, JIS (Autor) Outra; Maria D M C R Ribeiro da Silva (Autor) FCUP; Manuel J S Monte (Autor) FCUP

Revista

Título: Journal of Chemical Thermodynamics

Vol. 128

Páginas: 45-54

ISSN: 0021-9614

Editora: Elsevier

Indexação

ISI Web of Knowledge - 27 Citações

Scopus - 27 Citações

Outras Informações

ID Authenticus: P-00P-G83

DOI: 10.1016/j.jct.2018.07.023

Abstract (EN): Vanillin is a naturally occurring phenolic aldehyde that is world-wide known for its flavouring properties. This work reports an extensive experimental and computational study of its thermodynamic properties. The vapour pressures of crystalline and liquid phases of vanillin were measured in the following temperature ranges T = (321.0-350.7) K and (324.9-382.3) K respectively, using a static method based on diaphragm capacitance gauge. Additionally, the crystalline vapour pressures were also measured in the temperature interval T = (303.1-325.2) K, using a Knudsen mass-loss effusion technique. The standard molar enthalpies, entropies and Gibbs energies of sublimation and of vaporization, at selected reference temperatures, were derived from the vapour pressure measurements. The enthalpies of vaporization and of sublimation, at T = 298.15 K, were also determined using Calvet microcalorimetry and the standard (p degrees = 10(5) Pa) molar enthalpy of formation, in the crystalline phase, at T = 298.15 K, was derived from its standard massic energy of combustion measured by static-bomb combustion calorimetry. From the experimental results, the standard molar enthalpy of formation in the gaseous phase, at T = 298.15 K, was calculated and compared with the values estimated by employing quantum chemical calculations. To analyse the thermodynamic stability of vanillin, the standard Gibbs energies of formation in crystalline and gaseous phases were calculated. The molar enthalpy of fusion determined using DSC is compared with indirect results determined using Calvet microcalorimetry and vapour pressure measurements. (C) 2018 Elsevier Ltd.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10