Thermodynamic study on the sublimation of succinic acid and of methyl- and dimethyl-substituted succinic and glutaric acids

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

Authors

da Silva, MAV (Author) FCUP; Monte, MJS (Author) FCUP; Ribeiro, JR (Author) Other

Journal

Title: Journal of Chemical Thermodynamics

Vol. 33

Pages: 23-31

ISSN: 0021-9614

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 31 Citations

Scopus - 31 Citations

Scientific classification

FOS: Engineering and technology > Mechanical engineering

Other information

Authenticus ID: P-000-XB9

DOI: 10.1006/jcht.2000.0715

Abstract (EN): The Knudsen mass-loss effusion technique was used to measure the vapour pressures at different temperatures of the following crystalline dicarboxylic acids: succinic acid, between T = 360.11 K and T = 375.14 K; methylsuccinic acid, between T = 343.12 K and T = 360.11 K; 2,2-dimethylsuccinic acid, between T = 350.11 K, and T = 365.11 K; 2-methylglutaric acid, between T = 338.38 K and T = 347.63 K; and 2,2-dimethylglutaric acid between T = 342.18 K and T = 352.66 K. From the temperature dependence of the vapour pressure, the standard molar enthalpies of sublimation were derived by the Clausius-Clapeyron equation and the molar entropies of sublimation at equilibrium pressures were calculated. Using estimated values for the heat capacity differences between the gas and the crystal phases of the studied compounds, the standard, p(o) = 10(5) Pa, molar enthalpies, entropies and Gibbs energies of sublimation at T = 298.15 K, were derived: (C) 2001 Academic Press

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9