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Author(s): Manuel J S Monte
Almeida, ARRP
Matos, MAR
Title: Thermodynamic Study on the Sublimation of Five Aminomethoxybenzoic Acids
Issue Date: 2010
Abstract: The Knudsen mass-loss effusion technique was used to measure the vapor pressures at different temperatures of the following aminomethoxybenzoic acids: 2-amino-3-methoxybenzoic acid, between (349.12 and 369.18) K; 2-amino-5-methoxybenzoic acid, between (353.13 and 375.17) K; 3-amino-4-methoxybenzoic acid, between (379.67 and 399.18) K; 3-amino-5-methoxybenzoic acid, between (380.16 and 400.18) K; and 4-amino-3-methoxybenzoic acid, between (373.14 and 395.17) K. From the temperature dependences of the vapor pressure of the crystalline compounds, the standard (p degrees = 10(5) Pa) molar enthalpies and Gibbs energies Of Sublimation, at T = 298.15 K, were derived. The results allowed the estimation of these two thermodynamic properties for two isomers not Studied in this work-2-amino-6-methoxybenzoic acid and 3-amino-2-methoxybenzoic acid. Differential scanning calorimetry was Used to measure the temperature and molar enthalpy of fusion of the studied isomers.
Subject: Química física, Engenharia química
Scientific areas: Ciências da engenharia e tecnologias::Engenharia química
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FCUP - Artigo em Revista Científica Internacional

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