Catalytic gasification of poultry manure and eucalyptus wood mixture in supercritical water / Tau Len-Kelly Yong in Industrial & engineering chemistry research, Vol. 51 N° 16 (Avril 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 16 (Avril 2012) . - pp. 5685-5690 Titre : Catalytic gasification of poultry manure and eucalyptus wood mixture in supercritical water Type de document : texte imprimé Auteurs : Tau Len-Kelly Yong, Auteur ; Yukihiko Matsumura, Auteur Année de publication : 2012 Article en page(s) : pp. 5685-5690 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Supercritical state Wood Poultry manure Gasification Catalytic reaction Résumé : The effect of wood addition on supercritical water gasification (SCWG) of poultry manure is investigated for broiler-derived wastes consisting of manure and the bedding material such as wood sawdust. SCWG of poultry manure (0.5 wt %) with Eucalyptus wood (0-0.3 wt %) is conducted in a continuous flow system for the temperature range of 550-650 °C and a pressure of 25 MPa. The organic matter in the poultry manure is mainly converted into fuel gases such as H2, CO2, and CH4. During SCWG of poultry manure and wood, not only decomposition of both but also reactions between their decomposition products occur. Wood biomass (cellulose and hemicellulose) are easily decomposed in SCW compared to poultry manure. However, at higher loading of wood in the mixture, the existence of inhibiting compounds in the wood decelerates the gas producing pathways in the overall reactions. The usage of activated carbon in the feedstock mixture improves the gasification efficiency. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25834481 [article] Catalytic gasification of poultry manure and eucalyptus wood mixture in supercritical water [texte imprimé] / Tau Len-Kelly Yong, Auteur ; Yukihiko Matsumura, Auteur . - 2012 . - pp. 5685-5690. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 16 (Avril 2012) . - pp. 5685-5690 Mots-clés : Supercritical state Wood Poultry manure Gasification Catalytic reaction Résumé : The effect of wood addition on supercritical water gasification (SCWG) of poultry manure is investigated for broiler-derived wastes consisting of manure and the bedding material such as wood sawdust. SCWG of poultry manure (0.5 wt %) with Eucalyptus wood (0-0.3 wt %) is conducted in a continuous flow system for the temperature range of 550-650 °C and a pressure of 25 MPa. The organic matter in the poultry manure is mainly converted into fuel gases such as H2, CO2, and CH4. During SCWG of poultry manure and wood, not only decomposition of both but also reactions between their decomposition products occur. Wood biomass (cellulose and hemicellulose) are easily decomposed in SCW compared to poultry manure. However, at higher loading of wood in the mixture, the existence of inhibiting compounds in the wood decelerates the gas producing pathways in the overall reactions. The usage of activated carbon in the feedstock mixture improves the gasification efficiency. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25834481

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Reaction kinetics of the lignin conversion in supercritical water / Tau Len-Kelly Yong in Industrial & engineering chemistry research, Vol. 51 N° 37 (Septembre 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 37 (Septembre 2012) . - pp. 11975–11988 Titre : Reaction kinetics of the lignin conversion in supercritical water Type de document : texte imprimé Auteurs : Tau Len-Kelly Yong, Auteur ; Yukihiko Matsumura, Auteur Année de publication : 2012 Article en page(s) : pp. 11975–11988 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Kinetics Résumé : The effect of temperature (390–450 °C) and residence time (0.5–10 s) at a pressure of 25 MPa was investigated for lignin conversion in supercritical water (SCW) using a continuous flow apparatus designed to rapidly heat the system to the desired reaction temperature. Conversion of lignin in SCW occurs rapidly, and complete depolymerization can be achieved within a 5 s residence time. A high degree of depolymerization is achieved from rapid heating to supercritical temperatures. In addition, supercritical conditions result in a high yield of solid that does not significantly change with an increase in temperature or residence time. To test the suggested hypothesis that the formation of low molecular weight fragments and cross-linking of these fragments forms higher molecular weight fragments, the yield of char, gaseous products, phenolic compounds (phenol, guaiacol, catechol, o-cresol, m-cresol, and catechol) and aromatic hydrocarbons (benzene, toluene, and naphthalene) were determined. The formation of phenolic compounds at short residence time indicates that ether bonds in lignin are easily degraded under supercritical conditions. A reaction network model was proposed, and the subsequent kinetic parameters for the conversion pathways were determined by assuming a first-order reaction. It is observed that the rate constant of overall lignin conversion obeys Arrhenius behavior. The individual rate constants of each reaction in the network are evaluated to determine conformity to Arrhenius behavior. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300921d [article] Reaction kinetics of the lignin conversion in supercritical water [texte imprimé] / Tau Len-Kelly Yong, Auteur ; Yukihiko Matsumura, Auteur . - 2012 . - pp. 11975–11988. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 37 (Septembre 2012) . - pp. 11975–11988 Mots-clés : Kinetics Résumé : The effect of temperature (390–450 °C) and residence time (0.5–10 s) at a pressure of 25 MPa was investigated for lignin conversion in supercritical water (SCW) using a continuous flow apparatus designed to rapidly heat the system to the desired reaction temperature. Conversion of lignin in SCW occurs rapidly, and complete depolymerization can be achieved within a 5 s residence time. A high degree of depolymerization is achieved from rapid heating to supercritical temperatures. In addition, supercritical conditions result in a high yield of solid that does not significantly change with an increase in temperature or residence time. To test the suggested hypothesis that the formation of low molecular weight fragments and cross-linking of these fragments forms higher molecular weight fragments, the yield of char, gaseous products, phenolic compounds (phenol, guaiacol, catechol, o-cresol, m-cresol, and catechol) and aromatic hydrocarbons (benzene, toluene, and naphthalene) were determined. The formation of phenolic compounds at short residence time indicates that ether bonds in lignin are easily degraded under supercritical conditions. A reaction network model was proposed, and the subsequent kinetic parameters for the conversion pathways were determined by assuming a first-order reaction. It is observed that the rate constant of overall lignin conversion obeys Arrhenius behavior. The individual rate constants of each reaction in the network are evaluated to determine conformity to Arrhenius behavior. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300921d

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