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Conversion of glucose to hydrogen-rich gas by supercritical water in a microchannel reactor / Aron K. Goodwin in Industrial & engineering chemistry research, Vol. 47 n°12 (Juin 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°12 (Juin 2008) . - p. 4106–4114 Titre : Conversion of glucose to hydrogen-rich gas by supercritical water in a microchannel reactor Type de document : texte imprimé Auteurs : Aron K. Goodwin, Auteur ; Gregory L. Rorrer, Auteur Année de publication : 2008 Article en page(s) : p. 4106–4114 Note générale : Bibliogr. p. 4113-4114 Langues : Anglais (eng) Mots-clés : Microchannel  reactors;  Glucose  --  gasification;  Supercritical  water Résumé : Microchannel reactors offer the intensification of heat transfer to endothermic chemical reactions. Microchannel reactors consist of a parallel array of micron-scale channels that are integrated into one device using microfabrication techniques. The gasification of glucose by supercritical water was studied in a stainless-steel microchannel reactor at 250 bar and 650−750 °C. The microchannel reactor architecture consisted of a parallel array of 21 rectangular microchannels (75 µm × 500 µm), each of 100 cm length, that were packaged into a serpentine pattern of 25 layers. At 750 °C, glucose was completely converted to gas products within a 2.0 s residence time, yielding an average gas composition of 53% H2, 35% CO2, 10% CH4, and 0.5% CO and a H2 yield of 5.7 ± 0.3 mol H2/mol glucose. At 650 °C, the intermediate products from the decomposition of glucose prior to their gasification and reforming were characterized. Routes for glucose transformation included the decomposition to acetic and propanoic acids, acid-catalyzed dehydration to 5-hydroxymethylfurfural and 2,5-hexanedione, and conversion to phenol. This study has shown that microchannel reactors have considerable promise for intensifying the thermochemical conversion of biomass constituents to useful chemicals and fuels. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie701725p [article] Conversion of glucose to hydrogen-rich gas by supercritical water in a microchannel reactor [texte imprimé] / Aron K. Goodwin, Auteur ; Gregory L. Rorrer, Auteur . - 2008 . - p. 4106–4114. Bibliogr. p. 4113-4114 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°12 (Juin 2008) . - p. 4106–4114 Mots-clés : Microchannel  reactors;  Glucose  --  gasification;  Supercritical  water Résumé : Microchannel reactors offer the intensification of heat transfer to endothermic chemical reactions. Microchannel reactors consist of a parallel array of micron-scale channels that are integrated into one device using microfabrication techniques. The gasification of glucose by supercritical water was studied in a stainless-steel microchannel reactor at 250 bar and 650−750 °C. The microchannel reactor architecture consisted of a parallel array of 21 rectangular microchannels (75 µm × 500 µm), each of 100 cm length, that were packaged into a serpentine pattern of 25 layers. At 750 °C, glucose was completely converted to gas products within a 2.0 s residence time, yielding an average gas composition of 53% H2, 35% CO2, 10% CH4, and 0.5% CO and a H2 yield of 5.7 ± 0.3 mol H2/mol glucose. At 650 °C, the intermediate products from the decomposition of glucose prior to their gasification and reforming were characterized. Routes for glucose transformation included the decomposition to acetic and propanoic acids, acid-catalyzed dehydration to 5-hydroxymethylfurfural and 2,5-hexanedione, and conversion to phenol. This study has shown that microchannel reactors have considerable promise for intensifying the thermochemical conversion of biomass constituents to useful chemicals and fuels. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie701725p

Modeling of supercritical water gasification of xylose to hydrogen-rich gas in a hastelloy microchannel reactor / Aron K. Goodwin in Industrial & engineering chemistry research, Vol. 50 N° 12 (Juin 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7172-7182 Titre : Modeling of supercritical water gasification of xylose to hydrogen-rich gas in a hastelloy microchannel reactor Type de document : texte imprimé Auteurs : Aron K. Goodwin, Auteur ; Gregory L. Rorrer, Auteur Année de publication : 2011 Article en page(s) : pp. 7172-7182 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Microreactor  Gasification  Supercritical  state  Modeling Résumé : Microchannel reactors offer high rates of heat transfer that intensify biomass gasification in supercritical water by sustaining the reaction temperature in the presence of endothermic reforming reactions and providing rapid fluid heating. Furthermore, the large ratio of surface area to volume in the micro channels enhances "unintentional" catalytic activity from the reactor wall for reactors comprised of nickel alloys such as Hastelloy. In this study, a parallel-channel Hastelloy C-276 microreactor was used to gasify xylose, a hemicellulose model compound, at 650 °C and 250 bar. The reactor consisted of 14 parallel microchannels, each measuring 127 μm × 1000 μm, integrated into a contiguous reactor block using scalable microfabrication techniques. The channels were configured in a serpentine design, which resulted in temperature gradients within the channels during fluid heating isolated from those in subsequent channel passes. Complete conversion of a 4.0 wt % aqueous xylose solution to hydrogen-rich gas was achieved with an average fluid residence time of 1.4 s. Computational fluid dynamics (CFD) modeling was used to simulate xylose gasification in the microchannel reactor and investigate temperature gradients produced by the heat of reaction for xylose gasification. Additional CFD simulations were used to show the effect of short residence times (less than 1.0 s) on the reacting fluid temperature while in the reactor. The results from this study suggest that parallel-channel Hastelloy microreactors potentially offer a unique way to improve biomass gasification by supercritical water. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239031 [article] Modeling of supercritical water gasification of xylose to hydrogen-rich gas in a hastelloy microchannel reactor [texte imprimé] / Aron K. Goodwin, Auteur ; Gregory L. Rorrer, Auteur . - 2011 . - pp. 7172-7182. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7172-7182 Mots-clés : Microreactor  Gasification  Supercritical  state  Modeling Résumé : Microchannel reactors offer high rates of heat transfer that intensify biomass gasification in supercritical water by sustaining the reaction temperature in the presence of endothermic reforming reactions and providing rapid fluid heating. Furthermore, the large ratio of surface area to volume in the micro channels enhances "unintentional" catalytic activity from the reactor wall for reactors comprised of nickel alloys such as Hastelloy. In this study, a parallel-channel Hastelloy C-276 microreactor was used to gasify xylose, a hemicellulose model compound, at 650 °C and 250 bar. The reactor consisted of 14 parallel microchannels, each measuring 127 μm × 1000 μm, integrated into a contiguous reactor block using scalable microfabrication techniques. The channels were configured in a serpentine design, which resulted in temperature gradients within the channels during fluid heating isolated from those in subsequent channel passes. Complete conversion of a 4.0 wt % aqueous xylose solution to hydrogen-rich gas was achieved with an average fluid residence time of 1.4 s. Computational fluid dynamics (CFD) modeling was used to simulate xylose gasification in the microchannel reactor and investigate temperature gradients produced by the heat of reaction for xylose gasification. Additional CFD simulations were used to show the effect of short residence times (less than 1.0 s) on the reacting fluid temperature while in the reactor. The results from this study suggest that parallel-channel Hastelloy microreactors potentially offer a unique way to improve biomass gasification by supercritical water. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239031