High-yield non-catalytic supercritical transesterification of soybean oil to biodiesel induced by gradual heating in a batch reactor

作者：Javier Palacios Nereo Francisco; Olivares Carrillo Pilar; Perez de los Rios Antonia; Quesada Medina Joaquin^*

来源：Journal of Supercritical Fluids, 2016, 111: 135-142.

DOI：10.1016/j.supflu.2016.01.022

• Biodiesel
• Supercritical methanol
• FAMEs
• Soybean oil
• Gradual heating
• Thermal decomposition

The non-catalytic synthesis of biodiesel in supercritical methanol from soybean oil was conducted in a batch reactor using three different reaction approaches: (1) process at constant temperature, (2) gradual heating process, and (3) process combining a phase of gradual heating followed by a phase at constant temperature (hybrid process). In the conditions leading to the highest yields of biodiesel during the constant temperature and gradual heating processes (87.5 mol% at 320 degrees C and 83 mol% at a heating rate of 2.60 degrees C/min, respectively), a considerable degree of thermal decomposition of the biodiesel synthesized (16 and 10 wt.%, respectively) was observed. However, the use of a low heating rate (0.51 degrees C/min) and a subsequent maintenance time of 10 min at 320 degrees C during the hybrid process completely prevented the onset of thermal decomposition reactions while transforming all glycerides into biodiesel, thus resulting in a yield of biodiesel of 99.9 mol%.

• 出版日期2016-5