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Ethanol dehydration by adsorption with starchy and cellulosic materials / Julian A. Quintero in Industrial & engineering chemistry research, Vol. 48 N° 14 (Juillet 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 14 (Juillet 2009) . - pp. 6783–6788 Titre : Ethanol dehydration by adsorption with starchy and cellulosic materials Type de document : texte imprimé Auteurs : Julian A. Quintero, Auteur ; Carlos A. Cardona, Auteur Année de publication : 2009 Article en page(s) : pp. 6783–6788 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Starchy  materials  Cellulosic  materials  Ethanol  dehydration  Adsorption Résumé : Adsorption with starchy and cellulosic materials was evaluated as an energy efficient technology for ethanol dehydration. Corn (Zea mays), upright elephant ear (Alocasia macrorrhiza), cassava (Manihot esculenta), and sugar cane bagasse (Saccharum), were used as sources of starch and cellulosic fibers and further used as adsorbents for water removal. Enzymes (α-amylase and cellulase for starch and cellulose, respectively) were evaluated as modifying agents with the aim of increasing water adsorption capacity. Native and enzyme-treated materials were examined with SEM, XRD, and BET analysis to determine the hydrolysis influence on structure and superficial area. Partial hydrolysis was obtained under operation conditions evaluated, as was shown by the SEM micrographs. Crystallinity increased with the enzymatic hydrolysis for all materials. For all materials, superficial area was not increased with enzymatic hydrolysis but water adsorption capacity was improved reaching an anhydrous product with enzyme-treated materials. Water adsorption capacity ranges from 4 to 19 g/ 100 g adsorbent were found for evaluated materials. Corn starch had the highest water adsorption capacity (19 g/ 100 g ads) while upright elephant ear starch presented the lowest (4.2 g/ 100 g ads). Tested materials showed affinity with water for both native and enzyme-treated cases. This allowed water to adsorb from the feed for obtaining anhydrous ethanol. It was suggested that water adsorption capacity was increased because of the more exposed hydroxyl groups from the polymeric structures evaluated (starch and cellulose). Applicability of these materials was oriented to small scale ethanol production plants in developing countries where rural areas are the objective and small productions are expected. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8015736 [article] Ethanol dehydration by adsorption with starchy and cellulosic materials [texte imprimé] / Julian A. Quintero, Auteur ; Carlos A. Cardona, Auteur . - 2009 . - pp. 6783–6788. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 14 (Juillet 2009) . - pp. 6783–6788 Mots-clés : Starchy  materials  Cellulosic  materials  Ethanol  dehydration  Adsorption Résumé : Adsorption with starchy and cellulosic materials was evaluated as an energy efficient technology for ethanol dehydration. Corn (Zea mays), upright elephant ear (Alocasia macrorrhiza), cassava (Manihot esculenta), and sugar cane bagasse (Saccharum), were used as sources of starch and cellulosic fibers and further used as adsorbents for water removal. Enzymes (α-amylase and cellulase for starch and cellulose, respectively) were evaluated as modifying agents with the aim of increasing water adsorption capacity. Native and enzyme-treated materials were examined with SEM, XRD, and BET analysis to determine the hydrolysis influence on structure and superficial area. Partial hydrolysis was obtained under operation conditions evaluated, as was shown by the SEM micrographs. Crystallinity increased with the enzymatic hydrolysis for all materials. For all materials, superficial area was not increased with enzymatic hydrolysis but water adsorption capacity was improved reaching an anhydrous product with enzyme-treated materials. Water adsorption capacity ranges from 4 to 19 g/ 100 g adsorbent were found for evaluated materials. Corn starch had the highest water adsorption capacity (19 g/ 100 g ads) while upright elephant ear starch presented the lowest (4.2 g/ 100 g ads). Tested materials showed affinity with water for both native and enzyme-treated cases. This allowed water to adsorb from the feed for obtaining anhydrous ethanol. It was suggested that water adsorption capacity was increased because of the more exposed hydroxyl groups from the polymeric structures evaluated (starch and cellulose). Applicability of these materials was oriented to small scale ethanol production plants in developing countries where rural areas are the objective and small productions are expected. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8015736

Process simulation of fuel ethanol production from lignocellulosics using aspen plus / Julian A. Quintero in Industrial & engineering chemistry research, Vol. 50 N° 10 (Mai 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 6205-6212 Titre : Process simulation of fuel ethanol production from lignocellulosics using aspen plus Type de document : texte imprimé Auteurs : Julian A. Quintero, Auteur ; Carlos A. Cardona, Auteur Année de publication : 2011 Article en page(s) : pp. 6205-6212 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Production  Fuel Résumé : Fuel ethanol production has become one of the most studied processes in the last two decades because of the need to decrease its production cost and improve its energetic performance. The most promising raw material is lignocellulosic biomass because of its negligible cost and high availability. On the other hand, most research has focused on single steps and has not considered the whole process design. Aspen Plus allowed designing this kind of process while considering relevant aspects such as raw material composition and kinetic models of chemical and biological transformation. In this study fuel ethanol from rice hulls has been simulated considering the kinetic parameters for acid pretreatment, detoxification, and fermentation with the aim of assessing the energy performance of the process. In addition, the economic evaluation was accomplished using Aspen Process Economic Analyzer with the objective of calculating the production cost. It was found that the dilute acid pretreatment had a higher ethanol yield (347.25 L/t) and lower energy consumption (86.75 MJ/L) than liquid hot water pretreatment. However, the latter pretreatment had a lower production cost (US$0.4367/L); although when energy cogeneration and electricity sales were included in the analysis, dilute acid pretreatment became the most economic technology with a lower production cost (US$0.1918/L). DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24158918 [article] Process simulation of fuel ethanol production from lignocellulosics using aspen plus [texte imprimé] / Julian A. Quintero, Auteur ; Carlos A. Cardona, Auteur . - 2011 . - pp. 6205-6212. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 6205-6212 Mots-clés : Production  Fuel Résumé : Fuel ethanol production has become one of the most studied processes in the last two decades because of the need to decrease its production cost and improve its energetic performance. The most promising raw material is lignocellulosic biomass because of its negligible cost and high availability. On the other hand, most research has focused on single steps and has not considered the whole process design. Aspen Plus allowed designing this kind of process while considering relevant aspects such as raw material composition and kinetic models of chemical and biological transformation. In this study fuel ethanol from rice hulls has been simulated considering the kinetic parameters for acid pretreatment, detoxification, and fermentation with the aim of assessing the energy performance of the process. In addition, the economic evaluation was accomplished using Aspen Process Economic Analyzer with the objective of calculating the production cost. It was found that the dilute acid pretreatment had a higher ethanol yield (347.25 L/t) and lower energy consumption (86.75 MJ/L) than liquid hot water pretreatment. However, the latter pretreatment had a lower production cost (US$0.4367/L); although when energy cogeneration and electricity sales were included in the analysis, dilute acid pretreatment became the most economic technology with a lower production cost (US$0.1918/L). DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24158918