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Optimization of the Dilute Acid Hydrolyzator for Cellulose-to-Bioethanol Saccharification

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  • Theocharis Tsoutsos

    (Environmental Engineering Department, Technical University of Crete, University Campus, Chania, GR 73100, Greece)

  • Dimitris Bethanis

    (Environmental Engineering Department, Technical University of Crete, University Campus, Chania, GR 73100, Greece)

Abstract

The production of fermentable sugar solutions for bioethanol production is optimized. The process of acid hydrolysis using dilute H 2 SO 4 was selected. Suitable lignocellulosics which are abundant in the Mediterranean (corn stover, hardwood and wheat straw) were investigated, and therefore their exploitation could be economically feasible. The process was studied in the two most common hydrolyzators (batch and continuous stirred) by developing a specific simulator for different raw materials. The simulation was applied in a wide range of temperatures (100–240 °C) and acid concentrations (0.5–3.0% w/w), in order to optimize the productivity of fermentable pentosans and hexosans. It was confirmed that the production of sugar-rich solutions required a two-stage process; in the first stage the degradation of sugars takes place, since pentoses are formulated under milder conditions than hexoses; in the second stage of simulation, a variety of samples with high sugar concentration and low degradation products are tested. The xylose productivity ranges between 85–95% under the most optimal conditions compared to the theoretical values, while large variations in glucose were frequent (10–55%) in comparison with the theoretical values. The best theoretical results were achieved for wheat straw hydrolysis in a batch reactor.

Suggested Citation

  • Theocharis Tsoutsos & Dimitris Bethanis, 2011. "Optimization of the Dilute Acid Hydrolyzator for Cellulose-to-Bioethanol Saccharification," Energies, MDPI, vol. 4(10), pages 1-23, October.
    • Handle: RePEc:gam:jeners:v:4:y:2011:i:10:p:1601-1623:d:14434
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    References listed on IDEAS

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    1. Kondili, E.M. & Kaldellis, J.K., 2007. "Biofuel implementation in East Europe: Current status and future prospects," Renewable and Sustainable Energy Reviews, Elsevier, vol. 11(9), pages 2137-2151, December.
    2. David Pimentel & Marcia Pimentel, 2008. "Corn and Cellulosic Ethanol Cause Major Problems," Energies, MDPI, vol. 1(1), pages 1-3, June.
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