Optimization of biodiesel production from wet microalgal biomass by direct transesterification using the surface response methodology
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URI: http://hdl.handle.net/10835/15146
DOI: https://doi.org/10.1016/j.renene.2018.06.001
DOI: https://doi.org/10.1016/j.renene.2018.06.001
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Macías Sánchez, María Dolores; Robles Medina, Alfonso; Jiménez Callejón, María José; Hita Peña, Estrella; González Moreno, Pedro Antonio; [et al.]Fecha
2018-06-01Resumen
The production of fatty acid methyl esters (FAMEs, biodiesel) was optimized from wet Nannochloropsis gaditana microalgal biomass (81.8 wt% water and 28.1 wt% saponifiable lipids, SLs, from the dry biomass). FAME production was carried out by direct acid-catalyzed methylation of the SLs from the microalgal biomass and FAME extraction with hexane. A three-variable, three-level Box-Behnken design (BBD) was applied to optimize the sulphuric acid (catalyst) concentration, the methanol/SL ratio and the hexane/SL ratio. The best FAME yield was obtained with a methanol/SL ratio of 254 mL/g, a sulphuric acid concentration of 3.7 % (v/v) and a hexane/SL ratio of 107.7 mL/g at 100ºC and for 105 min. Under these conditions, 100% of the SLs were transformed into FAMEs. Finally, the FAME purity was increased from 78.7 to 86.8 wt% using an adsorption treatment with bentonite.
Palabra/s clave
Biodiesel
Wet microalga
Nannochloropsis gaditana
Direct transesterification
Surface response methodology
Adsorption