Optimisation of Acid Hydrolysis in Ethanol Production from Prosopis Juliflora
American Journal of Energy Engineering
Volume 2, Issue 6, November 2014, Pages: 127-132
Received: Nov. 29, 2014; Accepted: Dec. 17, 2014; Published: Dec. 22, 2014
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Author
Temesgen Atnafu Yemata, Institute of technology, Department of Chemical Engineering, Addis Ababa, Ethiopia; Addis Ababa University, Chemical Engineering Department, Addis Ababa, Ethiopia
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Abstract
Lignocellulosic materials (eg.Prosopis juliflora) can be utilized to produce ethanol, a promising alternative energy source for the limited crude oil. This study involved optimization of acid hydrolysis in ethanol production from prosopis juliflora. The conversion of prosopis juliflora to ethanol can be achieved mainly by three process steps: pretreatment of prosopis juliflora wood to remove lignin and hemicellulose, acid hydrolysis of pretreated prosopis juliflora to convert cellulose into reducing sugar (glucose) and fermentation of the sugars to ethanol using Saccharomyces cerevisiae in anaerobic condition. A two level full factorial design with four factors, two levels and two replicas (24*2=32 experimental runs) was applied to optimize acid hydrolysis and study the interaction effects of acid hydrolysis factors, namely, acid concentration, solid fraction, temperature, and time. An optimization was carried out to optimize acid hydrolysis process variables so as to determine the best acid concentration, solid fraction, temperature, and contact time that resulted maximum ethanol yield. The screening of significant acid hydrolysis factors were done by using the two-level full factorial design using design expert® 7 software. The statistical analysis showed that the ethanol yield of (40.91% (g/g)) was obtained at optimised acid hydrolysis variables of 0.5%v/v acid concentration, 5%w/w solid fraction, 105.01°C temperature, and 10 minutes hydrolysis time.
Keywords
Prosopis Juliflora, Pretreatment, Hydrolysis, Fermentation, 2 Level Factorial, Optimization
To cite this article
Temesgen Atnafu Yemata, Optimisation of Acid Hydrolysis in Ethanol Production from Prosopis Juliflora, American Journal of Energy Engineering. Vol. 2, No. 6, 2014, pp. 127-132. doi: 10.11648/j.ajee.20140206.11
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