Determination of the vapor pressure of ethyl esters by Differential Scanning Calorimetry

Autor(es)

Akisawa Silva, Luciana Y. ^[1] ; Matricarde Falleiro, Rafael M. ^[1] ; Meirelles, Antonio J. A. ^[2] ; Kraehenbuehl, Maria A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Campinas UNICAMP, Sch Chem Engn, Dept Chem Proc, Lab Thermodynam Properties, LPT, BR-13083970 Campinas, SP - Brazil

^[2] Univ Campinas UNICAMP, Sch Food Engn, Dept Food Engn, EXTRAE, BR-13083862 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF CHEMICAL THERMODYNAMICS; v. 43, n. 6, p. 943-947, JUN 2011.
• Citações Web of Science: 29

Resumo

Differential Scanning Calorimetry (d.s.c.) was used to determine the vapor pressure of the following ethyl esters: ethyl laurate, ethyl myristate, ethyl palmitate, ethyl stearate, ethyl oleate and ethyl linoleate in the range from 1.33 to 9.33 kPa. These esters are the major constituents of the biodiesel obtained from the transesterification of some vegetable oils with ethanol. Samples of 2 to 5 mg were used in the analysis, with a heating rate of 25 degrees C.min(-1) and a pinhole with a diameter of 0.25 mm. The results showed that Differential Scanning Calorimetry was a suitable technique for measuring the vapor pressure of organic compounds like fatty esters. The constants of the Antoine equation were determined from the experimental data and the validity of this equation in representing the vapor pressure and vaporization enthalpy of the compounds under study was examined. (C) 2011 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 07/02737-0 - Determinação experimental de dados de equilíbrio líquido-vapor de misturas binárias de componentes do biodiesel através da calorimetria diferencial exploratória (DSC)
• Beneficiário: Maria Alvina Krähenbühl
• Modalidade de apoio: Auxílio à Pesquisa - Regular