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

• Type: Article in International Scientific Journal
• Date: 2001

Authors

Monte, MJS (Author) FCUP; Hillesheim, DM (Author) Other

Journal

Title: Journal of Chemical & Engineering Data

Vol. 46 No. 3

Pages: 1601-1604

ISSN: 0021-9568

Publisher: American Chemical Society

Indexing

ISI Web of Knowledge - 18 Citations

Scopus - 16 Citations

Scientific classification

FOS: Engineering and technology > Chemical engineering

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 4