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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]  in Industrial & 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

Char formation mechanism in supercritical water gasification process / Athika Chuntanapum in Industrial & engineering chemistry research, Vol. 49 N° 9 (Mai 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 9 (Mai 2010) . - pp. 4055-4062 Titre : Char formation mechanism in supercritical water gasification process : a study of model compounds Type de document : texte imprimé Auteurs : Athika Chuntanapum, Auteur ; Yukihiko Matsumura, Auteur Année de publication : 2010 Article en page(s) : pp. 4055-4062 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Modeling  Gasification  Supercritical  state  Formation  mechanism Résumé : Char is one of the undesirable products in the supercritical water gasification of biomass, causing a reduction in carbon gasification efficiency. 5-HMF (5-hydroxymethylfurfural) is believed to be an intermediate in the char formation pathway. In this Article, the rate of formation of char particles obtained from experiments using glucose (a biomass model compound) was compared to that from experiments using 5-HMF (Chuntanapum and Matsumura, 2009). The glucose experiments were conducted in a temperature range of 300—400 °C, at 25 MPa, and for a residence time up to 70 s. The initial concentration of glucose was varied from 1.5 to 3 wt % (i.e., 0.083 to 0.167 M). Glucose was found to produce char particles 2 orders of magnitude faster than 5-HMF feedstock. The copresence of the other glucose decomposition products is thought to cause the difference in the char formation mechanism (i.e., the side reaction between 5-HMF and the other decomposition products) from that of 5-HMF alone. FT-IR and Raman spectroscopy of the solid products was carried out. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=22732894 [article] Char formation mechanism in supercritical water gasification process : a study of model compounds [texte imprimé] / Athika Chuntanapum, Auteur ; Yukihiko Matsumura, Auteur . - 2010 . - pp. 4055-4062. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 9 (Mai 2010) . - pp. 4055-4062 Mots-clés : Modeling  Gasification  Supercritical  state  Formation  mechanism Résumé : Char is one of the undesirable products in the supercritical water gasification of biomass, causing a reduction in carbon gasification efficiency. 5-HMF (5-hydroxymethylfurfural) is believed to be an intermediate in the char formation pathway. In this Article, the rate of formation of char particles obtained from experiments using glucose (a biomass model compound) was compared to that from experiments using 5-HMF (Chuntanapum and Matsumura, 2009). The glucose experiments were conducted in a temperature range of 300—400 °C, at 25 MPa, and for a residence time up to 70 s. The initial concentration of glucose was varied from 1.5 to 3 wt % (i.e., 0.083 to 0.167 M). Glucose was found to produce char particles 2 orders of magnitude faster than 5-HMF feedstock. The copresence of the other glucose decomposition products is thought to cause the difference in the char formation mechanism (i.e., the side reaction between 5-HMF and the other decomposition products) from that of 5-HMF alone. FT-IR and Raman spectroscopy of the solid products was carried out. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=22732894

Formation of tarry material from 5-HMF in subcritical and supercritical water / Athika Chuntanapum in Industrial & engineering chemistry research, Vol. 48 N° 22 (Novembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 22 (Novembre 2009) . - pp. 9837–9846 Titre : Formation of tarry material from 5-HMF in subcritical and supercritical water Type de document : texte imprimé Auteurs : Athika Chuntanapum, Auteur ; Yukihiko Matsumura, Auteur Année de publication : 2010 Article en page(s) : pp. 9837–9846 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Compound  5-hydroxymethylfurfural  Biomass  Tarry  material Résumé : The compound 5-hydroxymethylfurfural (5-HMF) is thought to be an intermediate for the formation of tarry material in the supercritical water gasification (SCWG) of biomass. To gain insight on the formation mechanism of tarry material, we examined 5-HMF under both subcritical and supercritical conditions. The experiments of this study were conducted in a continuous reactor designed for an instant heating of 5-HMF solution to the reaction temperature. The reaction temperatures were set at 350 and 450 °C, and the pressure was set at 25 MPa. The initial concentration of 5-HMF and the residence time were adjusted in the range of 0.02−0.15 M (at room temperature) and 80−3000 s, respectively. The formation of char particles was only observed under the subcritical conditions. Char yield increased as the initial concentration of 5-HMF rose, with a reaction order of 4.29, with respect to 5-HMF concentration. The liquid products obtained from the 5-HMF decomposition also contributed to the polymerization to form char, with a reaction order of 1.21, based on their concentration. The sensitivity analysis indicated the high sensitivity of reaction orders on the char yield. The liquid products were identified by liquid chromatography/mass spectroscopy (LC/MS) and high-performance liquid chromatography (HPLC). The char particles were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, and Raman spectrometry. The char characterization results implied that the char particles formed had a polyaromatic structure. Based on our experimental findings, we proposed a mechanism of char particle formation from 5-HMF. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900423g [article] Formation of tarry material from 5-HMF in subcritical and supercritical water [texte imprimé] / Athika Chuntanapum, Auteur ; Yukihiko Matsumura, Auteur . - 2010 . - pp. 9837–9846. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 22 (Novembre 2009) . - pp. 9837–9846 Mots-clés : Compound  5-hydroxymethylfurfural  Biomass  Tarry  material Résumé : The compound 5-hydroxymethylfurfural (5-HMF) is thought to be an intermediate for the formation of tarry material in the supercritical water gasification (SCWG) of biomass. To gain insight on the formation mechanism of tarry material, we examined 5-HMF under both subcritical and supercritical conditions. The experiments of this study were conducted in a continuous reactor designed for an instant heating of 5-HMF solution to the reaction temperature. The reaction temperatures were set at 350 and 450 °C, and the pressure was set at 25 MPa. The initial concentration of 5-HMF and the residence time were adjusted in the range of 0.02−0.15 M (at room temperature) and 80−3000 s, respectively. The formation of char particles was only observed under the subcritical conditions. Char yield increased as the initial concentration of 5-HMF rose, with a reaction order of 4.29, with respect to 5-HMF concentration. The liquid products obtained from the 5-HMF decomposition also contributed to the polymerization to form char, with a reaction order of 1.21, based on their concentration. The sensitivity analysis indicated the high sensitivity of reaction orders on the char yield. The liquid products were identified by liquid chromatography/mass spectroscopy (LC/MS) and high-performance liquid chromatography (HPLC). The char particles were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, and Raman spectrometry. The char characterization results implied that the char particles formed had a polyaromatic structure. Based on our experimental findings, we proposed a mechanism of char particle formation from 5-HMF. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900423g

New correlation for mass transfer characteristics of spray column / Tsubsa Tanda in Industrial & engineering chemistry research, Vol. 50 N° 23 (Décembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 23 (Décembre 2011) . - pp. 13554-13560 Titre : New correlation for mass transfer characteristics of spray column Type de document : texte imprimé Auteurs : Tsubsa Tanda, Auteur ; Koichi Shirai, Auteur ; Yukihiko Matsumura, Auteur Année de publication : 2012 Article en page(s) : pp. 13554-13560 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Spray  tower  Mass  transfer  Correlation  analysis  Correlation Résumé : This paper presents a study of the mass transfer characteristics of a spray column being used as a dehumidification device for air. The experiment was conducted using high humidity air and polyethylene glycol (PEG) as a desiccant solution over a range of process conditions including various liquid flow rates, gas flow rates, water concentrations of PEG, temperatures of PEG, and nozzle diameters. The performance of the spray column was evaluated in terms of volumetric mass transfer coefficients. The results were well expressed by the correlation using dimensionless groups including the physical properties of the liquid and nozzle diameter. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25267514 [article] New correlation for mass transfer characteristics of spray column [texte imprimé] / Tsubsa Tanda, Auteur ; Koichi Shirai, Auteur ; Yukihiko Matsumura, Auteur . - 2012 . - pp. 13554-13560. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 23 (Décembre 2011) . - pp. 13554-13560 Mots-clés : Spray  tower  Mass  transfer  Correlation  analysis  Correlation Résumé : This paper presents a study of the mass transfer characteristics of a spray column being used as a dehumidification device for air. The experiment was conducted using high humidity air and polyethylene glycol (PEG) as a desiccant solution over a range of process conditions including various liquid flow rates, gas flow rates, water concentrations of PEG, temperatures of PEG, and nozzle diameters. The performance of the spray column was evaluated in terms of volumetric mass transfer coefficients. The results were well expressed by the correlation using dimensionless groups including the physical properties of the liquid and nozzle diameter. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25267514

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]  in Industrial & 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

Reactor development for supercritical water gasification of 4.9 wt% glucose solution at 673 K by using computational fluid dynamics / Takuya Yoshida in Industrial & engineering chemistry research, Vol. 48 N° 18 (Septembre 2009) 

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Temperature effect on hydrothermal decomposition of glucose in sub- and supercritical water / Chutinan Promdej in Industrial & engineering chemistry research, Vol. 50 N° 14 (Juillet 2011) 

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