Thermal Hydrolysis of Orange Peel and its Fermentation with Alginate Beads to Produce Ethanol

Brenda Corona Vázquez, Gabriela Roa-Morales, Reyna Natividad Rangel, Patricia Balderas Hernandez, Jaime Saucedo Luna


Orange peel (OP) was subjected to thermal hydrolysis at temperature (T) and pressure (P) values lower than 180 °C and 1000 kPa, respectively, to minimize the energy consumption and obtain a good ethanol yield. The process was conducted in an autoclave, a pressurized reactor for studying the effect of T (120 to 180 °C), P (500 to 1000 kPa), gas type (N2 or CO2), and OP loading (2.5 x10-2 and 5 x10-2 gmL-1) on the reducing sugars yield. The results were compared with those from acid hydrolysis. Hydrolysates were fermented using immobilized yeast on alginate beads, and the highest ethanol yield of 33.14 g/L was obtained from OP treated at 120 °C. Under these conditions, a minimum of 1,407 kWh energy consumption was achieved.


Ethanol; Thermal hydrolysis; Orange peel; Alginate beads

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