Production of Bioethanol from Corncob

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Addis Ababa University


The objective of this study was production of bio ethanol from corncob which in effects to minimize energy cost and substituting non renewable energy by using renewable resources. It was employed dilute acid hydrolysis, because it is easy and productive process. The experiment was designed by Central Composite Design (CCD) with three factor (Concentration, temperature and time) and triplicate run, the acid concentration was varied from 3 to 5%, hydrolysis temperature was varied from 120 to 140℃, and hydrolysis time was varied from 30 to 90minutes.The maximum experimental observed yield of 48.4 % at the operating process variable at a temperature of 130℃, acid concentration of 3%, and a hydrolysis time of 60 minutes. Acid concentration and hydrolysis time have a statistically significant effect on the yield with p-value of 0.0113 and 0.0237 respectively. However, high acid concentration as well as increasing hydrolysis time causes a decline in the ethanol yield. The statistical analysis also showed that the ethanol yield of (47.19 %) was obtained at optimized variables of 3% acid concentration, 124.3 ℃ temperature, and at a time of 30 minutes. So this reveals that a good agreement with the observed value of ethanol yield (48.4%). From this, it can conclude that the selected model was adequate to fit the data of response variable. Chemical characterization of the bio-ethanol produced was performed by FTIR. The result shows that, the ethanol produced contains OH, CO, CH2, and CH3 functional groups which indicate the presence of ethanol in the product.



Process engineering