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Enhanced bio - oil yield from liquefaction of cornstalk in sub - and supercritical ethanol by acid - chlorite pretreatment / Hua-Min Liu in Industrial & engineering chemistry research, Vol. 50 N° 19 (Octobre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 19 (Octobre 2011) . - pp. 10928-10935 Titre : Enhanced bio - oil yield from liquefaction of cornstalk in sub - and supercritical ethanol by acid - chlorite pretreatment Type de document : texte imprimé Auteurs : Hua-Min Liu, Auteur ; Bing Feng, Auteur ; Run-Cang Sun, Auteur Année de publication : 2011 Article en page(s) : pp. 10928-10935 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Pretreatment  Supercritical  state  Liquefaction Résumé : Acid―chlorite pretreatment was developed to enhance bio-oil yield and decrease the optimum reaction temperature of cornstalk liquefaction in a stainless steel reactor (0.5 L) at temperatures of 200—340 °C. The effects of liquefaction temperature and ethanol amount on the bio-oil yield from liquefaction of cornstalk before and after pretreatment were investigated. The results showed that the pretreatment could markedly enhance the bio-oil yield and decrease the optimum temperature. The highest bio-oil yield (31.4%) was obtained from the liquefaction at the reaction temperature of 260 °C from the 1.5 h pretreated cornstalk. Unpretreated and pretreated cornstalks differed in chemical components, in which the acid―chlorite pretreatment increased carbohydrate content and removed some amount of lignin. Scanning electron microscopy showed that the pretreated cornstalks had extensive anomalous porosity and lamellar structures. X-ray analysis showed that this pretreatment process was unable to break apart inter- and intrachain hydrogen bonding in cellulose fibrils. GC/MS analysis showed that the pretreatment had an important effect on the formation of various compounds in the bio-oiL. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24573286 [article] Enhanced bio - oil yield from liquefaction of cornstalk in sub - and supercritical ethanol by acid - chlorite pretreatment [texte imprimé] / Hua-Min Liu, Auteur ; Bing Feng, Auteur ; Run-Cang Sun, Auteur . - 2011 . - pp. 10928-10935. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 19 (Octobre 2011) . - pp. 10928-10935 Mots-clés : Pretreatment  Supercritical  state  Liquefaction Résumé : Acid―chlorite pretreatment was developed to enhance bio-oil yield and decrease the optimum reaction temperature of cornstalk liquefaction in a stainless steel reactor (0.5 L) at temperatures of 200—340 °C. The effects of liquefaction temperature and ethanol amount on the bio-oil yield from liquefaction of cornstalk before and after pretreatment were investigated. The results showed that the pretreatment could markedly enhance the bio-oil yield and decrease the optimum temperature. The highest bio-oil yield (31.4%) was obtained from the liquefaction at the reaction temperature of 260 °C from the 1.5 h pretreated cornstalk. Unpretreated and pretreated cornstalks differed in chemical components, in which the acid―chlorite pretreatment increased carbohydrate content and removed some amount of lignin. Scanning electron microscopy showed that the pretreated cornstalks had extensive anomalous porosity and lamellar structures. X-ray analysis showed that this pretreatment process was unable to break apart inter- and intrachain hydrogen bonding in cellulose fibrils. GC/MS analysis showed that the pretreatment had an important effect on the formation of various compounds in the bio-oiL. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24573286

Influence of Incubation Time on the Physicochemical Properties of the isolated hemicelluloses from steam-exploded lespedeza stalks / Kun Wang in Industrial & engineering chemistry research, Vol. 49 N° 18 (Septembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8797–8804 Titre : Influence of Incubation Time on the Physicochemical Properties of the isolated hemicelluloses from steam-exploded lespedeza stalks Type de document : texte imprimé Auteurs : Kun Wang, Auteur ; Feng Xu, Auteur ; Run-Cang Sun, Auteur Année de publication : 2010 Article en page(s) : pp. 8797–8804 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Physicochemical  properties Résumé : Hemicellulosic polysaccharides were isolated from the raw and steam-exploded Lespedeza crytobytrya stalks by sequential 1 M NaOH extraction and fractionated into Hemi-a and Hemi-b fractions by acidification and ethanol precipitation, respectively. The Hemi-a fractions had relatively lower molecular weights and took up 84.6−95.5% of the total released hemicelluloses. After steam explosion, both hemicellulosic fractions were obviously degraded, and a certain amount of glucose or oligosaccharides derived from the amorphous cellulose was coisolated. The influence of increasing incubation time from 2 to 10 min is further discussed, based on the physicochemical properties of the obtained hemicelluloses characterized in terms of sugar component, gel permeation chromatography (GPC), thermal stability, and 13C NMR spectroscopy analysis. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101180p [article] Influence of Incubation Time on the Physicochemical Properties of the isolated hemicelluloses from steam-exploded lespedeza stalks [texte imprimé] / Kun Wang, Auteur ; Feng Xu, Auteur ; Run-Cang Sun, Auteur . - 2010 . - pp. 8797–8804. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8797–8804 Mots-clés : Physicochemical  properties Résumé : Hemicellulosic polysaccharides were isolated from the raw and steam-exploded Lespedeza crytobytrya stalks by sequential 1 M NaOH extraction and fractionated into Hemi-a and Hemi-b fractions by acidification and ethanol precipitation, respectively. The Hemi-a fractions had relatively lower molecular weights and took up 84.6−95.5% of the total released hemicelluloses. After steam explosion, both hemicellulosic fractions were obviously degraded, and a certain amount of glucose or oligosaccharides derived from the amorphous cellulose was coisolated. The influence of increasing incubation time from 2 to 10 min is further discussed, based on the physicochemical properties of the obtained hemicelluloses characterized in terms of sugar component, gel permeation chromatography (GPC), thermal stability, and 13C NMR spectroscopy analysis. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101180p