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Characteristics of solid residues obtained from hot-compressed-water treatment of woody biomass / Nobusuke Kobayashi in Industrial & engineering chemistry research, Vol. 48 N°1 (Janvier 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°1 (Janvier 2009) . - P. 373-379 Titre : Characteristics of solid residues obtained from hot-compressed-water treatment of woody biomass Type de document : texte imprimé Auteurs : Nobusuke Kobayashi, Editeur scientifique ; Nobuhiko Okada, Editeur scientifique ; Ayumu Hirakawa, Editeur scientifique Année de publication : 2009 Article en page(s) : P. 373-379 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Hot-Compressed-Water  Treatment  Solid  Residues  Woody  biomass Résumé : Hydrolysis experiment of woody biomass in hot compressed water (HCW) was conducted in a batch-type reactor and the characteristics of solid residue after the HCW hydrolysis treatment were measured to understand the hydrolysis mechanism of woody biomass. Woody slurry of Douglas fir was used in this HCW experiment. Reaction temperature was controlled from 423 to 523 K, and the reaction time was set at 1 min. After separation of solid residues from the hydrolysis liquid material, the solid residue characteristics, such as proximate and ultimate analysis, particle size distribution, particle shape, surface area, pore size distribution, chemical composition, and equilibrium moisture content ratio, were measured and then the decomposition mechanism of woody biomass in HCW was discussed. It was found that the solid residue characteristics yielded in HCW changed drastically depending on the reaction temperature. For example, cellulose crystallinity decreased with increasing reaction temperature, and the physical characteristics of solid residue, such as particle shape, particle diameter, and pore size distribution, also changed dramatically depending on the reaction temperature. The physical or chemical characteristic change in HCW was strongly related to the decomposition of components of woody biomass at that reaction temperature. Dehydration of woody components was one of the most important factors to understand physical characteristics during HCW treatment. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800870k [article] Characteristics of solid residues obtained from hot-compressed-water treatment of woody biomass [texte imprimé] / Nobusuke Kobayashi, Editeur scientifique ; Nobuhiko Okada, Editeur scientifique ; Ayumu Hirakawa, Editeur scientifique . - 2009 . - P. 373-379. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°1 (Janvier 2009) . - P. 373-379 Mots-clés : Hot-Compressed-Water  Treatment  Solid  Residues  Woody  biomass Résumé : Hydrolysis experiment of woody biomass in hot compressed water (HCW) was conducted in a batch-type reactor and the characteristics of solid residue after the HCW hydrolysis treatment were measured to understand the hydrolysis mechanism of woody biomass. Woody slurry of Douglas fir was used in this HCW experiment. Reaction temperature was controlled from 423 to 523 K, and the reaction time was set at 1 min. After separation of solid residues from the hydrolysis liquid material, the solid residue characteristics, such as proximate and ultimate analysis, particle size distribution, particle shape, surface area, pore size distribution, chemical composition, and equilibrium moisture content ratio, were measured and then the decomposition mechanism of woody biomass in HCW was discussed. It was found that the solid residue characteristics yielded in HCW changed drastically depending on the reaction temperature. For example, cellulose crystallinity decreased with increasing reaction temperature, and the physical characteristics of solid residue, such as particle shape, particle diameter, and pore size distribution, also changed dramatically depending on the reaction temperature. The physical or chemical characteristic change in HCW was strongly related to the decomposition of components of woody biomass at that reaction temperature. Dehydration of woody components was one of the most important factors to understand physical characteristics during HCW treatment. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800870k

Fluid behavior of woody biomass slurry during hydrothermal treatment / Nousuke Kobayashi in Industrial & engineering chemistry research, Vol. 50 N° 7 (Avril 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 7 (Avril 2011) . - pp. 4133-4139 Titre : Fluid behavior of woody biomass slurry during hydrothermal treatment Type de document : texte imprimé Auteurs : Nousuke Kobayashi, Auteur ; Nobuhiko Okada, Auteur ; Yasuhiro Tanabe, Auteur Année de publication : 2011 Article en page(s) : pp. 4133-4139 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Hydrothermal  treatment  Biomass Résumé : Hydrothermal experiment of woody biomass was carried out in an autoclave, and a property change of the woody slurry associated with hydrothermal reaction was analyzed. The reaction conditions, such as reaction temperature, reaction period, and slurry concentration, were varied in this experiment, and the effect of the hydrothermal conditions on the slurry characteristics was evaluated. To evaluate the property change of the woody slurry, apparent viscosity, particle size, pH, and ξ potential measurements of the hydrothermally influenced slurry were conducted. The fluid resistance of the slurry during hydrothermal experiment was also measured with an autoclave reactor. With application of hydrothermal treatment on a woody slurry, significant change of the slurry property was observed. The particle size decreased during hydrothermal experiment with increasing reaction temperature, and this particle size change influenced the slurry behavior. Due to the particle size reduction, the apparent viscosity of the treated slurry became smaller, and the treated slurry showed strong pseudoplastic fluid behavior. With a longer reaction period, the particle size was getting smaller by the hydrolysis reaction; however, particle size enlargement caused by a swelling and/or agglomeration occurred when the reactor's temperature started to increase. This particle size enlargement behavior at the beginning of the hydrothermal experiment increased the fluid resistance of the slurry significantly. pH value and the ξ potential value were also influenced by the hydrothermal treatment. pH and absolute ξ potential values dropped with increasing reaction temperature; however, the absolute ξ potential value of the slurry reversely increased when the reaction temperature was over 523 K. The increment of carboxyl radical on the surface of the reacted particle changed particle―particle and particle-solvent interactions. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24027661 [article] Fluid behavior of woody biomass slurry during hydrothermal treatment [texte imprimé] / Nousuke Kobayashi, Auteur ; Nobuhiko Okada, Auteur ; Yasuhiro Tanabe, Auteur . - 2011 . - pp. 4133-4139. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 7 (Avril 2011) . - pp. 4133-4139 Mots-clés : Hydrothermal  treatment  Biomass Résumé : Hydrothermal experiment of woody biomass was carried out in an autoclave, and a property change of the woody slurry associated with hydrothermal reaction was analyzed. The reaction conditions, such as reaction temperature, reaction period, and slurry concentration, were varied in this experiment, and the effect of the hydrothermal conditions on the slurry characteristics was evaluated. To evaluate the property change of the woody slurry, apparent viscosity, particle size, pH, and ξ potential measurements of the hydrothermally influenced slurry were conducted. The fluid resistance of the slurry during hydrothermal experiment was also measured with an autoclave reactor. With application of hydrothermal treatment on a woody slurry, significant change of the slurry property was observed. The particle size decreased during hydrothermal experiment with increasing reaction temperature, and this particle size change influenced the slurry behavior. Due to the particle size reduction, the apparent viscosity of the treated slurry became smaller, and the treated slurry showed strong pseudoplastic fluid behavior. With a longer reaction period, the particle size was getting smaller by the hydrolysis reaction; however, particle size enlargement caused by a swelling and/or agglomeration occurred when the reactor's temperature started to increase. This particle size enlargement behavior at the beginning of the hydrothermal experiment increased the fluid resistance of the slurry significantly. pH value and the ξ potential value were also influenced by the hydrothermal treatment. pH and absolute ξ potential values dropped with increasing reaction temperature; however, the absolute ξ potential value of the slurry reversely increased when the reaction temperature was over 523 K. The increment of carboxyl radical on the surface of the reacted particle changed particle―particle and particle-solvent interactions. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24027661