Experimental assessment on the enzymatic hydrolysis of hydrothermally pretreated eucalyptus globulus wood / Aloia Romaní in Industrial & engineering chemistry research, Vol. 49 N° 10 (Mai 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 10 (Mai 2010) . - pp. 4653–4663 Titre : Experimental assessment on the enzymatic hydrolysis of hydrothermally pretreated eucalyptus globulus wood Type de document : texte imprimé Auteurs : Aloia Romaní, Auteur ; Gil Garrote, Auteur ; Jose Luis Alonso, Auteur Année de publication : 2010 Article en page(s) : pp. 4653–4663 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Enzymatic hydrolysis. Résumé : Hydrothermal processing of Eucalyptus globulus wood was evaluated as a pretreatment for bioethanol manufacture, to assess the effects caused by the severity of wood solubilization, composition of liquors, and spent solid and suceptibility of substrates toward enzymatic hydrolysis. A factorial design was employed to assess the hydrolysis kinetics of spent solids. The liquor to solid ratio (6−20 g/g) and the enzyme to substrate ratio (8−28 FPU/g) were considered as independent variables. Generalized empirical models suitable for predicting glucose concentrations were developed. Using selected substrates and hydrolysis conditions (LSR = 6 g/g, ESR = 28 FPU/g), media containing more than 82 g glucose/L were obtained (with cellulose-to-glucose conversions of 75−80%), whereas cellulose-to-glucose conversions of 80−100% were obtained under a variety of experimental conditions. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100154m [article] Experimental assessment on the enzymatic hydrolysis of hydrothermally pretreated eucalyptus globulus wood [texte imprimé] / Aloia Romaní, Auteur ; Gil Garrote, Auteur ; Jose Luis Alonso, Auteur . - 2010 . - pp. 4653–4663. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 10 (Mai 2010) . - pp. 4653–4663 Mots-clés : Enzymatic hydrolysis. Résumé : Hydrothermal processing of Eucalyptus globulus wood was evaluated as a pretreatment for bioethanol manufacture, to assess the effects caused by the severity of wood solubilization, composition of liquors, and spent solid and suceptibility of substrates toward enzymatic hydrolysis. A factorial design was employed to assess the hydrolysis kinetics of spent solids. The liquor to solid ratio (6−20 g/g) and the enzyme to substrate ratio (8−28 FPU/g) were considered as independent variables. Generalized empirical models suitable for predicting glucose concentrations were developed. Using selected substrates and hydrolysis conditions (LSR = 6 g/g, ESR = 28 FPU/g), media containing more than 82 g glucose/L were obtained (with cellulose-to-glucose conversions of 75−80%), whereas cellulose-to-glucose conversions of 80−100% were obtained under a variety of experimental conditions. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100154m

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Processing of acacia dealbata in aqueous media / Remedios Yáñez in Industrial & engineering chemistry research, Vol. 48 N° 14 (Juillet 2009)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N° 14 (Juillet 2009) . - pp. 6618–6626 Titre : Processing of acacia dealbata in aqueous media : first step of a wood biorefinery Type de document : texte imprimé Auteurs : Remedios Yáñez, Auteur ; Aloia Romaní, Auteur ; Gil Garrote, Auteur Année de publication : 2009 Article en page(s) : pp. 6618–6626 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Acacia dealbata Aqueous media Autohydrolysis Stability Résumé : In order to assess the suitability of autohydrolysis as a first biorefinery stage, Acacia dealbata wood samples were heated in aqueous media to a range of 170−240 °C. Under selected operational conditions (maximum temperature, 215 °C), 70% xylan was converted into xylooligosaccharides, whereas cellulose and lignin remained in solid phase with little alteration. The spent solids from treatments contained 65% cellulose (measured as glucan), 8% hemicelluloses, and 27% lignin. Kinetic models describing the Acacia dealbata wood solubilization as well as the autohydrolysis of the polysaccharide fractions (glucan, xylan, and arabinosyl and acetyl substituents of hemicelluloses) were developed. All the models considered sequential, first-order, pseudohomogeneous kinetics, with Arrhenius type dependence on temperature, and provided a satisfactory interpretation of experimental data. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900233x [article] Processing of acacia dealbata in aqueous media : first step of a wood biorefinery [texte imprimé] / Remedios Yáñez, Auteur ; Aloia Romaní, Auteur ; Gil Garrote, Auteur . - 2009 . - pp. 6618–6626. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 14 (Juillet 2009) . - pp. 6618–6626 Mots-clés : Acacia dealbata Aqueous media Autohydrolysis Stability Résumé : In order to assess the suitability of autohydrolysis as a first biorefinery stage, Acacia dealbata wood samples were heated in aqueous media to a range of 170−240 °C. Under selected operational conditions (maximum temperature, 215 °C), 70% xylan was converted into xylooligosaccharides, whereas cellulose and lignin remained in solid phase with little alteration. The spent solids from treatments contained 65% cellulose (measured as glucan), 8% hemicelluloses, and 27% lignin. Kinetic models describing the Acacia dealbata wood solubilization as well as the autohydrolysis of the polysaccharide fractions (glucan, xylan, and arabinosyl and acetyl substituents of hemicelluloses) were developed. All the models considered sequential, first-order, pseudohomogeneous kinetics, with Arrhenius type dependence on temperature, and provided a satisfactory interpretation of experimental data. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900233x

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