کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
230592 | 1427394 | 2013 | 9 صفحه PDF | دانلود رایگان |
• We investigated biodiesel production with ethanol under sub and supercritical conditions.
• Using low concentration of NaOH it was possible to obtain high conversions.
• Pseudo first order model kinetic represents the overall transesterification reaction.
The biodiesel obtained by the reaction of castor oil with ethanol under sub and supercritical condition (200–350 °C at endogenous pressure) using small amounts of sodium hydroxide (NaOH) as catalyst was studied. The influence of the operating variables such as temperature, reaction time, ethanol:oil molar ratio and catalyst concentration (when used) on the reaction yield was evaluated using a statistical design of experiments along with the surface response methodology for both the catalytic and non-catalytic processes. It was observed that using only 0.1% wt of NaOH for the catalytic process, amount smaller than the necessary to neutralize the castor oil, it was possible to obtain high yields. The maximum ethyl ester yield reached was 98.9% for the catalytic process and 56.2% for the non-catalytic process. Additionally, the reaction kinetic was determined and it was found that a pseudo first order model represents the overall reaction. Activation energies were calculated from the Arrhenius equation for both processes.
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Journal: The Journal of Supercritical Fluids - Volume 83, November 2013, Pages 124–132