Thermodynamic Study on the Sublimation of 2-Phenylacetic, 4-Phenylbutyric, and 5-Phenylvaleric Acid

Autor:	Manuel J. S. Monte and, Dorothea M. Hillesheim
Rok vydání:	2001
Předmět:	Phenylvaleric acid Enthalpy of sublimation Effusion Vapor pressure Chemistry General Chemical Engineering Physical chemistry Sublimation (phase transition) General Chemistry Knudsen number
Zdroj:	Journal of Chemical & Engineering Data. 46:1601-1604
ISSN:	1520-5134 0021-9568
DOI:	10.1021/je010153h
Popis:	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 = 105 Pa) for some carboxylic acids and other organic compounds is presented.
Databáze:	OpenAIRE
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