Model-free kinetics applied to the vaporization of caprylic acid

• DOI: 10.1007/s10973-009-0301-3
• Publication Date: 2009-07-27T11:42:57Z
• Authors: S. Arias; M. M. Prieto; B. Ramajo; A. Espina; J. R. García
• Keywords: Thermogravimetric analysis; Caprylic acid; Vaporization; Arrhenius plot

The evaporation of octanoic (caprylic) acid was investigated by means of thermogravimetric analysis (temperature range: 300–600 K) under a nitrogen dynamic atmosphere (heating rates: 0.16, 0.31, 0.63, 1.25, 2.5, 5 and 10 K min−1). Kinetic plots for a zero-order process were constructed based on the Arrhenius equation. The activation energy for the evaporation process was calculated via both the Arrhenius plot and Vyazovkin’s isoconversional model-free method.