RESEARCH ARTICLE


Exergetic Analysis of Bioethanol Production from Tunisian Waste Dates



Wahada Zeineb1, *, Khila Zouhour1, Louhichi Boulbaba2, Boukchina Rachid1, Hajjaji Noureddine1
1 Unité de Recherche Catalyse et Matériaux pour l'Environnement et les Procédés URCMEP (UR11ES85), Ecole Nationale d’Ingénieurs de Gabès, Université de Gabès, Rue Omar Ibn Alkhattab 6029 Gabès, Tunisia
2 Unité de Recherche Energétique et Environnement, Ecole Nationale d’Ingénieurs de Gabès, Université de Gabès, Rue Omar Ibn Alkhattab 6029 Gabès, Tunisia


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© 2018 Zeineb et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Unité de Recherche Catalyse et Matériaux pour l'Environnement et les Procédés URCMEP (UR11ES85), Ecole Nationale d’Ingénieurs de Gabès, Université de Gabès, Rue Omar Ibn Alkhattab 6029 Gabès, Tunisia; Tel: +216 55 622 668; Fax: +216 75 29 00 41; E-mail: zeinebwahada93@gmail.com


Abstract

Objective:

This study aims at contributing to the area of sustainable bioethanol production system development. The main objective of this study is to thermodynamically evaluate a bioethanol production process from waste dates.

Methods & Materials:

To this end, several chemical engineering assessment tools have been simultaneously applied. These tools simulate the bioethanol production process using the SuperPro software in order to determine all the materials and energy exchanges. An exergy analysis is also carried out, based on the first and second laws of thermodynamics, in order to locate thermodynamic imperfections in the process.

Results:

The results obtained show that approximately 60% of the exergy fed to the process is recovered in the useful products (bioethanol and exhausted pulp used as feedstuff). The overall exergy destroyed in the process considered is about 377 kW which represents 7% of the exergy reaching the process. The distillation section, the most energy-intensive stage, constitutes the main contributor of exergy destruction, followed by the fermentation reactor with contributions of 47% and 33%, respectively.

Keywords: Bioethanol, Waste dates, Thermodynamic analysis, Exergy, Distressing pressure, Greenhouse gas.