Thermodynamic analysis of ethanol/water system with the stoichiometric method

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An analysis of the chemical equilibrium of ethanol/water system, using the stoichiometric method, has been performed. Intermediate compounds and coke formation are analyzed. Ethanol is completely converted to ethylene and/or acetaldehyde. Taking into account the equilibrium constant values of format...

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Autores principales: Mas, V., Kipreos, R., Amadeo, N., Laborde, M.
Formato: JOUR
Materias:
Chemical equilibrium
Ethanol steam reforming
Hydrogen
Carbon dioxide
Carbon monoxide
Ethanol
Ethylene
Fuel cells
Reforming reactions
Steam
Thermodynamics
Water
Acetaldehyde
CO formation
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_03603199_v31_n1_p21_Mas
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_03603199_v31_n1_p21_Mas2023-10-03T15:26:22Z Thermodynamic analysis of ethanol/water system with the stoichiometric method Mas, V. Kipreos, R. Amadeo, N. Laborde, M. Chemical equilibrium Ethanol steam reforming Hydrogen Carbon dioxide Carbon monoxide Ethanol Ethylene Fuel cells Reforming reactions Steam Thermodynamics Water Acetaldehyde Chemical equilibrium CO formation Ethanol steam reforming Hydrogen An analysis of the chemical equilibrium of ethanol/water system, using the stoichiometric method, has been performed. Intermediate compounds and coke formation are analyzed. Ethanol is completely converted to ethylene and/or acetaldehyde. Taking into account the equilibrium constant values of formation and transformation reactions of ethylene and acetaldehyde, both compounds are intermediates in this system. Due to the relevance of carbon monoxide if hydrogen is used as feed of a PEM-type fuel cell, CO concentration in the equilibrium mixture was studied assuming two different scenarios: (a) CO as primary product and (b) CO2 as primary product. These two scenarios lead to suggest different routes for reaching the equilibrium. Thus, the results obtained in this work might help to interpret the experimental results far away from the equilibrium with the aim of elucidating the reaction mechanism. The knowledge of this mechanism is essential in order to minimize the CO formation. The thermodynamic feasibility of coke formation shown in a temperature vs. water/ethanol molar ratio has also been analyzed. The results indicate that if moderate temperatures are used, a molar ratio higher than 3 is required to avoid coke formation. © 2005 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_03603199_v31_n1_p21_Mas
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Chemical equilibrium
Ethanol steam reforming
Hydrogen
Carbon dioxide
Carbon monoxide
Ethanol
Ethylene
Fuel cells
Reforming reactions
Steam
Thermodynamics
Water
Acetaldehyde
Chemical equilibrium
CO formation
Ethanol steam reforming
Hydrogen
spellingShingle Chemical equilibrium
Ethanol steam reforming
Hydrogen
Carbon dioxide
Carbon monoxide
Ethanol
Ethylene
Fuel cells
Reforming reactions
Steam
Thermodynamics
Water
Acetaldehyde
Chemical equilibrium
CO formation
Ethanol steam reforming
Hydrogen
Mas, V.
Kipreos, R.
Amadeo, N.
Laborde, M.
Thermodynamic analysis of ethanol/water system with the stoichiometric method
topic_facet Chemical equilibrium
Ethanol steam reforming
Hydrogen
Carbon dioxide
Carbon monoxide
Ethanol
Ethylene
Fuel cells
Reforming reactions
Steam
Thermodynamics
Water
Acetaldehyde
Chemical equilibrium
CO formation
Ethanol steam reforming
Hydrogen
description An analysis of the chemical equilibrium of ethanol/water system, using the stoichiometric method, has been performed. Intermediate compounds and coke formation are analyzed. Ethanol is completely converted to ethylene and/or acetaldehyde. Taking into account the equilibrium constant values of formation and transformation reactions of ethylene and acetaldehyde, both compounds are intermediates in this system. Due to the relevance of carbon monoxide if hydrogen is used as feed of a PEM-type fuel cell, CO concentration in the equilibrium mixture was studied assuming two different scenarios: (a) CO as primary product and (b) CO2 as primary product. These two scenarios lead to suggest different routes for reaching the equilibrium. Thus, the results obtained in this work might help to interpret the experimental results far away from the equilibrium with the aim of elucidating the reaction mechanism. The knowledge of this mechanism is essential in order to minimize the CO formation. The thermodynamic feasibility of coke formation shown in a temperature vs. water/ethanol molar ratio has also been analyzed. The results indicate that if moderate temperatures are used, a molar ratio higher than 3 is required to avoid coke formation. © 2005 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
format JOUR
author Mas, V.
Kipreos, R.
Amadeo, N.
Laborde, M.
author_facet Mas, V.
Kipreos, R.
Amadeo, N.
Laborde, M.
author_sort Mas, V.
title Thermodynamic analysis of ethanol/water system with the stoichiometric method
title_short Thermodynamic analysis of ethanol/water system with the stoichiometric method
title_full Thermodynamic analysis of ethanol/water system with the stoichiometric method
title_fullStr Thermodynamic analysis of ethanol/water system with the stoichiometric method
title_full_unstemmed Thermodynamic analysis of ethanol/water system with the stoichiometric method
title_sort thermodynamic analysis of ethanol/water system with the stoichiometric method
url http://hdl.handle.net/20.500.12110/paper_03603199_v31_n1_p21_Mas
work_keys_str_mv AT masv thermodynamicanalysisofethanolwatersystemwiththestoichiometricmethod
AT kipreosr thermodynamicanalysisofethanolwatersystemwiththestoichiometricmethod
AT amadeon thermodynamicanalysisofethanolwatersystemwiththestoichiometricmethod
AT labordem thermodynamicanalysisofethanolwatersystemwiththestoichiometricmethod
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