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Hemicellulose extraction of mixed southern hardwood with water at 150 °C / M. Sefik Tunc in Industrial & engineering chemistry research, Vol. 47 N°18 (Septembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°18 (Septembre 2008) . - p. 7031–7037 Titre : Hemicellulose extraction of mixed southern hardwood with water at 150 °C : effect of time Type de document : texte imprimé Auteurs : M. Sefik Tunc, Auteur ; Adriaan R. P. van Heiningen, Auteur Année de publication : 2008 Article en page(s) : p. 7031–7037 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Hemicellulose  Extraction  Wood  Hydrothermal  dissolution Résumé : Hemicelluloses derived from biomass are presently underutilized. In order to develop more profitable biorefinery processes, the mechanism responsible for hemicellulose removal by pretreatments has to be further explored. The hydrothermal dissolution profile of the wood components cellulose, hemicelluloses, and lignin of a hardwood mixture during autohydrolysis in a modified Dionex ASE-100 is described. Well-closed material balances were obtained for lignin-free yield, xylan, and glucomannan when comparing the solid and liquid phases. Xylo-oligomers were the predominant component in the extract. Xylan initially dissolved as oligosaccharides and then slowly depolymerized into monomeric xylose. The residual xylan in wood was only slightly deacetylated. A smaller amount of glucomannan was removed as oligosaccharides. Arabinose and galactose were completely removed from wood as monomers at the end of the extraction process. Initially all acetyl groups were removed while still bound to oligosaccharides. Then, acetic acid was released by deacetylation of the dissolved oligosaccharides. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8007105 [article] Hemicellulose extraction of mixed southern hardwood with water at 150 °C : effect of time [texte imprimé] / M. Sefik Tunc, Auteur ; Adriaan R. P. van Heiningen, Auteur . - 2008 . - p. 7031–7037. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°18 (Septembre 2008) . - p. 7031–7037 Mots-clés : Hemicellulose  Extraction  Wood  Hydrothermal  dissolution Résumé : Hemicelluloses derived from biomass are presently underutilized. In order to develop more profitable biorefinery processes, the mechanism responsible for hemicellulose removal by pretreatments has to be further explored. The hydrothermal dissolution profile of the wood components cellulose, hemicelluloses, and lignin of a hardwood mixture during autohydrolysis in a modified Dionex ASE-100 is described. Well-closed material balances were obtained for lignin-free yield, xylan, and glucomannan when comparing the solid and liquid phases. Xylo-oligomers were the predominant component in the extract. Xylan initially dissolved as oligosaccharides and then slowly depolymerized into monomeric xylose. The residual xylan in wood was only slightly deacetylated. A smaller amount of glucomannan was removed as oligosaccharides. Arabinose and galactose were completely removed from wood as monomers at the end of the extraction process. Initially all acetyl groups were removed while still bound to oligosaccharides. Then, acetic acid was released by deacetylation of the dissolved oligosaccharides. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8007105