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

Theocharis Tsoutsos and Dimitris Bethanis
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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

Energies, 2011, vol. 4, issue 10, 1-23

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.

Keywords: bio-ethanol; acid hydrolysis; straw; cellulose; reactor design (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2011
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