Thermodynamic study on the sublimation of 2-phenylacetic, 4-phenylbutyric, and 5-phenylvaleric acid

• Tipo: Artigo em Revista Científica Internacional
• Data: 2001

Autores

Monte, MJS (Autor) FCUP; Hillesheim, DM (Autor) Outra

Revista

Título: Journal of Chemical & Engineering Data

Vol. 46 Nº 3

Páginas: 1601-1604

ISSN: 0021-9568

Editora: American Chemical Society

Indexação

ISI Web of Knowledge - 18 Citações

Scopus - 16 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia química

Outras Informações

ID Authenticus: P-000-SWV

DOI: 10.1021/je010153h

Abstract (EN): The Knudsen mass-loss effusion technique was used to measure the vapor pressures as a function of temperatures of the following crystalline carboxylic acids: 2-phenylacetic acid, between 305.17 K and 321.16 K; 2-phenylbutyric acid, between 309.16 K and 323.16 K, and 5-phenylvaleric acid, between 315.15 K and 327.18 K. From the temperature dependence of the vapor pressure of the crystalline samples, the standard molar enthalpies of sublimation at the mean temperature of the experimental range were derived by using the Clausius-Clapeyron equation. From these results the standard molar enthalpies, entropies, and Gibbs functions of sublimation at T = 298.15 K were calculated. A correlation between the enthalpies of sublimation and the temperature of sublimation at a reference pressure (p = 10(5) Pa) for some carboxylic acids and other organic compounds is presented.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 4