Thermodynamic Study of 4-n-Alkyloxybenzoic Acids

• Type: Article in International Scientific Journal
• Date: 2010

Authors

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

Journal

Title: Journal of Chemical & Engineering Data

Vol. 55 No. 1

Pages: 2238-2245

ISSN: 0021-9568

Publisher: American Chemical Society

Indexing

ISI Web of Knowledge - 21 Citations

Scopus - 22 Citations

Scientific classification

FOS: Engineering and technology > Chemical engineering

CORDIS: Physical sciences > Physics > Thermodynamics > Applied thermodynamics ; Physical sciences > Chemistry > Organic chemistry ; Physical sciences > Chemistry > Physical chemistry

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8