Thermodynamic Study of 4-n-Alkyloxybenzoic Acids

• Tipo: Artigo em Revista Científica Internacional
• Data: 2010

Autores

Fonseca, JMS (Autor) Outra; Luis M N B F Santos (Autor) FCUP; Manuel J S Monte (Autor) FCUP

Revista

Título: Journal of Chemical & Engineering Data

Vol. 55 Nº 1

Páginas: 2238-2245

ISSN: 0021-9568

Editora: American Chemical Society

Indexação

ISI Web of Knowledge - 21 Citações

Scopus - 22 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia química

CORDIS: Ciências Físicas > Física > Termodinâmica > Termodinâmica aplicada ; Ciências Físicas > Química > Química orgânica ; Ciências Físicas > Química > Química física

Outras Informações

ID Authenticus: P-003-68E

DOI: 10.1021/je900776y

Abstract (EN): The Knudsen mass-loss effusion technique was used for measuring the vapor pressures at different temperatures of the following 4-n-alkyloxybenzoic acids: 4-methoxybenzoic acid, between (340 and 362) K; 4-ethoxybenzoic acid, between (349 and 373) K; 4-propoxybenzoic acid, between (345 and 365) K; 4-butoxybenzoic acid, between (351 and 373) K; 4-pentyloxybenzoic acid, between (355 and 377) K; 4-hexyloxybenzoic acid, between (363 and 379) K; 4-heptyloxybenzoic acid, between (355 and 361) K; and 4-octyloxybenzoic acid, between (363 and 372) K. From the temperature dependence of the vapor pressure of each crystalline compound, the standard (p(0) = 10(5) Pa) molar enthalpies and Gibbs energies of sublimation, at T = 298.15 K, were derived. Differential scanning calorimetry was used in the study of phase transitions between condensed phases. The measured thermodynamic properties are compared with the results obtained on a previous similar study concerning the 4-n-alkylbenzoic acids series.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 8