Title: Compared exergy analysis of sugarcane bagasse sequential hydrolysis and fermentation and simultaneous saccharification and fermentation

Authors: Pablo Silva Ortiz; Silvio de Oliveira Jr.

Addresses: Laboratory of Environmental and Thermal Engineering, Department of Mechanical Engineering, University of São Paulo, Polytechnic School, Av. Prof. Luciano Gualberto, 1289 Cidade Universitária, CEP:05508-900, São Paulo, SP, Brazil ' Laboratory of Environmental and Thermal Engineering, Department of Mechanical Engineering, University of São Paulo, Polytechnic School, Av. Prof. Luciano Gualberto, 1289 Cidade Universitária, CEP:05508-900, São Paulo, SP, Brazil

Abstract: This paper presents the compared exergy analysis of the enzymatic hydrolysis of sugarcane bagasse through Sequential Hydrolysis and Fermentation-SHF and Simultaneous Saccharification and Fermentation-SSF configurations to obtain lignocellulosic ethanol. Four pre-treatment processes were considered: Steam Explosion-SE, Organosolv, Liquid Hot Water-LHW, and a combined SE and LHW method. The pre-treatments analysed simultaneously with the SHF (Cases 1, 3, 5 and 7) and SSF (Cases 2, 4, 6 and 8) configurations were carried out for the overall system focus on the wine production. Processes simulations were performed by using Aspen Plus^® to a plant with 500 t/h milling capacity. The results for SHF configurations in terms of exergy efficiency rate were 60.0% for case 1, 56.5% for case 3, 58.3% for case 5 and 59.4% for case 7. For SSF configurations, the exergy efficiency obtained in case 2, case 4, case 6 and case 8 were 62.4%, 58.3%, 60.3% and 61.5%, respectively.

Keywords: biomass conversion; bioethanol; exergy efficiency; enzymatic hydrolysis; lignocellulosic biomass; irreversibility rate; hydrolysis; fermentation; SHF; saccharification; wine production; sugarcane bagasse; exergy analysis; lignocellulosic ethanol; process simulation.

DOI: 10.1504/IJEX.2016.075880

International Journal of Exergy, 2016 Vol.19 No.4, pp.459 - 480

Received: 02 Sep 2014
Accepted: 09 Mar 2015
Published online: 12 Apr 2016 *

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