American Journal of Energy Engineering

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Optimisation of Acid Hydrolysis in Ethanol Production from Prosopis Juliflora

Received: 29 November 2014    Accepted: 17 December 2014    Published: 22 December 2014
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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.

DOI 10.11648/j.ajee.20140206.11
Published in American Journal of Energy Engineering (Volume 2, Issue 6, November 2014)
Page(s) 127-132
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2024. Published by Science Publishing Group

Keywords

Prosopis Juliflora, Pretreatment, Hydrolysis, Fermentation, 2 Level Factorial, Optimization

References
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[8] Shiferaw, H., Teketay, D., Nemomissa, S. and Assefa, F. (2004). Some biological characteristics that foster the invasion of Prosopis juliflora (Sw.) DC at Middle Awash Rift Valley Area,Northeastern Ethiopia. Journal of Arid Environments 58/135.154.
[9] Taherzadeh MJ, Eklund R, Gustafsson L, Niklasson C, Lide´n G. 1997. Characterization and fermentation of dilute-acid hydrolyzates from wood. Ind Eng Chem Res 36:4659–4665.
[10] Taye, T., Ameha, T., Adefiris, W. and Getu, E. (2004). Biological Impact Asssessment on selected IAS Plants on Native Species Biodiversity, Report submitted to EARO, Ethiopia, tree species in semi-arid Senegal. Forest Ecology and Management 176: 253-264.
[11] US Congress, 1984, Commercial Biotechnology: An International Analysis, report OTA-BA-218, US Congress, Office of Technology Assessment, Washington DC USA.
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[13] Wyman, C.E., Dale, B.E., Elander, R.T., Holtzapple, M., Ladisch, M.R. and Lee, Y.Y., (2005) Coordinated development of leading biomass pretreatment technologies. Bioresour. Technol. 96 1959-1966).
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[16] Van Zyl, W., and Kargi, F., 2007, Consolidated Bioprocessing for bioethanol production using Saccharomyces cerevisiae Pages 205-235, Biofuels.
[17] Vaccarino, C., Locurto, R., Tripodo, M. M., Patane, R., Lagana, G. and Ragno, A.(1989), "SCP from orange peel by fermentation with fungi–acid-treated peel," Biol. Wastes 30, 1-10.
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Author Information
  • Institute of technology, Department of Chemical Engineering, Addis Ababa, Ethiopia; Addis Ababa University, Chemical Engineering Department, Addis Ababa, Ethiopia

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    Temesgen Atnafu Yemata. (2014). Optimisation of Acid Hydrolysis in Ethanol Production from Prosopis Juliflora. American Journal of Energy Engineering, 2(6), 127-132. https://doi.org/10.11648/j.ajee.20140206.11

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    Temesgen Atnafu Yemata. Optimisation of Acid Hydrolysis in Ethanol Production from Prosopis Juliflora. Am. J. Energy Eng. 2014, 2(6), 127-132. doi: 10.11648/j.ajee.20140206.11

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    AMA Style

    Temesgen Atnafu Yemata. Optimisation of Acid Hydrolysis in Ethanol Production from Prosopis Juliflora. Am J Energy Eng. 2014;2(6):127-132. doi: 10.11648/j.ajee.20140206.11

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  • @article{10.11648/j.ajee.20140206.11,
      author = {Temesgen Atnafu Yemata},
      title = {Optimisation of Acid Hydrolysis in Ethanol Production from Prosopis Juliflora},
      journal = {American Journal of Energy Engineering},
      volume = {2},
      number = {6},
      pages = {127-132},
      doi = {10.11648/j.ajee.20140206.11},
      url = {https://doi.org/10.11648/j.ajee.20140206.11},
      eprint = {https://download.sciencepg.com/pdf/10.11648.j.ajee.20140206.11},
      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.},
     year = {2014}
    }
    

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    AU  - Temesgen Atnafu Yemata
    Y1  - 2014/12/22
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    JF  - American Journal of Energy Engineering
    JO  - American Journal of Energy Engineering
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    AB  - 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.
    VL  - 2
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