Commercial Hydrated Lime as a Cost-Effective Solid Base for the Transesterification of Wasted Soybean Oil with Methanol for Biodiesel Production
Por:
Sanchez-Cantu, M, Perez-Diaz, LM, Rosales, R, Ramirez, E, Apreza-Sies, A, Pala-Rosas, I, Rubio-Rosas, E, Aguilar-Franco, M, Valente, JS
Publicada:
1 jul 2011
Resumen:
The transesterification of used soybean oil with methanol was carried out over hydrated lime (HL), Ca(OH)(2), and its decomposition products in the 200-500 degrees C range. The catalysts were characterized by X-ray powder diffraction (XRD), thermogravimetric analysis, and scanning electron microscopy. The XRD powder patterns demonstrated that the pristine sample consisted of a mixture of calcium hydroxide and calcite. It was noticed that the coexistence of CaO, Ca(OH)(2), and CaCO3 remained up to 400 degrees C. At 500 degrees C, Ca(OH)(2) is transformed into CaO so that this and CaCO3 are the only remaining phases. In the transesterification reaction, the influence of calcination temperature, reaction time, catalyst amount, methanol:oil ratio, and reaction temperature was studied. Full conversion of the raw materials into biodiesel (BD) was obtained with the fresh HL. In order to determine any change in the solid, it was recovered after 10, 30, and 60 min of reaction and analyzed by XR
Filiaciones:
Aguilar-Franco, M:
Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 04510, DF, Mexico
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