Documents disponibles écrits par cet auteur

Optimization of galactoglucomannans and acidic arabinans recovery in softwood / Lyne Desharnais in Industrial & engineering chemistry research, Vol. 50 N° 24 (Décembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 24 (Décembre 2011) . - pp. 14217-14220 Titre : Optimization of galactoglucomannans and acidic arabinans recovery in softwood Type de document : texte imprimé Auteurs : Lyne Desharnais, Auteur ; Fang Du, Auteur ; Nicolas Brosse, Auteur Année de publication : 2012 Article en page(s) : pp. 14217-14220 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Softwood  Optimization Résumé : Autohydrolysis of softwood chips, used as raw material in a paper mill, was studied to simulate one of the aspects of industrial hydrolytic steps of a thermomechanical pulping process. The compositions of the pulps and of the hydrolysates were determined as a function of the residence time and the severity of the treatment. It was found that acidic arabinogalactans were largely affected and depolymerized, even at low severity (log(R0) < 2). The percentage of residual arabinans in the pulp after hydrolysis seemed be a good indicator of the severity of the treatment and can provide an effective guide for an optimization of the industrial process. A hydrolytic step performed at a severity oflog(R0) = 1.8 resulted in the extraction of∼ 100% of the water-soluble acidic arabinogalactans, which constitutes the main part of the αanionic trash" released in mechanical pulping. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25299893 [article] Optimization of galactoglucomannans and acidic arabinans recovery in softwood [texte imprimé] / Lyne Desharnais, Auteur ; Fang Du, Auteur ; Nicolas Brosse, Auteur . - 2012 . - pp. 14217-14220. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 24 (Décembre 2011) . - pp. 14217-14220 Mots-clés : Softwood  Optimization Résumé : Autohydrolysis of softwood chips, used as raw material in a paper mill, was studied to simulate one of the aspects of industrial hydrolytic steps of a thermomechanical pulping process. The compositions of the pulps and of the hydrolysates were determined as a function of the residence time and the severity of the treatment. It was found that acidic arabinogalactans were largely affected and depolymerized, even at low severity (log(R0) < 2). The percentage of residual arabinans in the pulp after hydrolysis seemed be a good indicator of the severity of the treatment and can provide an effective guide for an optimization of the industrial process. A hydrolytic step performed at a severity oflog(R0) = 1.8 resulted in the extraction of∼ 100% of the water-soluble acidic arabinogalactans, which constitutes the main part of the αanionic trash" released in mechanical pulping. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25299893

Pretreatment of miscanthus x giganteus using the ethanol organosolv process for ethanol production / Nicolas Brosse in Industrial & engineering chemistry research, Vol. 48 N° 18 (Septembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 18 (Septembre 2009) . - pp. 8328–8334 Titre : Pretreatment of miscanthus x giganteus using the ethanol organosolv process for ethanol production Type de document : texte imprimé Auteurs : Nicolas Brosse, Auteur ; Sannigrahi, Poulomi, Auteur ; Arthur Ragauskas, Auteur Année de publication : 2010 Article en page(s) : pp. 8328–8334 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Miscanthus  x  giganteus  Aqueous-ethanol  organosolv  treatment Résumé : A two-step procedure involving a dilute-acid presoaking step and an aqueous-ethanol organosolv treatment has been evaluated and optimized for the conversion of Miscanthus x giganteus (MxG). This process allowed for the efficient fractionation of the raw material into a cellulose-rich residue, an ethanol organosolv lignin fraction, and a water-soluble fraction mainly containing hemicellulose sugars. It was found that the presoaking step not only allowed a better recovery of xylans, but also enhanced the dissolution of lignin in the aqueous ethanol and the digestibility of the remaining cellulose by enzymes. The optimized conditions yielded a solid residue containing about 95% of the initial glucans, from which 98% was recovered after 48 h of enzymatic hydrolysis. In addition, 71% of the lignin was recovered as ethanol organosolv lignin (EOL), and the recovery of the xylans was equivalent to 73% of the xylose present in the raw Miscanthus. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9006672 [article] Pretreatment of miscanthus x giganteus using the ethanol organosolv process for ethanol production [texte imprimé] / Nicolas Brosse, Auteur ; Sannigrahi, Poulomi, Auteur ; Arthur Ragauskas, Auteur . - 2010 . - pp. 8328–8334. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 18 (Septembre 2009) . - pp. 8328–8334 Mots-clés : Miscanthus  x  giganteus  Aqueous-ethanol  organosolv  treatment Résumé : A two-step procedure involving a dilute-acid presoaking step and an aqueous-ethanol organosolv treatment has been evaluated and optimized for the conversion of Miscanthus x giganteus (MxG). This process allowed for the efficient fractionation of the raw material into a cellulose-rich residue, an ethanol organosolv lignin fraction, and a water-soluble fraction mainly containing hemicellulose sugars. It was found that the presoaking step not only allowed a better recovery of xylans, but also enhanced the dissolution of lignin in the aqueous ethanol and the digestibility of the remaining cellulose by enzymes. The optimized conditions yielded a solid residue containing about 95% of the initial glucans, from which 98% was recovered after 48 h of enzymatic hydrolysis. In addition, 71% of the lignin was recovered as ethanol organosolv lignin (EOL), and the recovery of the xylans was equivalent to 73% of the xylose present in the raw Miscanthus. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9006672