Monitoring of Biodiesel Synthesis Reactions by Isothermal Microcalorimetry

R. Andre, G. Defosse & P. Le Parlouër
The transesterification of colza oil by ethanol using sodium hydroxide as a catalyst was studied using isothermal calorimetry. The functionalities and sensitivity of the instrumentation allowed following up the reaction at temperatures as low as 30°C. The enthalpy of this exothermic reaction was determined to be equal to ­10.9 ± 0.6J/g of ethanolate solution. Thermal conversion data at 30°C, 40°C and 50°C confirmed the acceleration of the reaction with temperature. Three thermal steps were noticed...