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Degradation of cellulose in dilute aqueous solutions of acidic ionic liquid 1 - (1 - Propylsulfonic) - 3 - methylimidazolium chloride, and p - toluenesulfonic acid at moderate temperatures and pressures / Ananda S. Amarasekara in Industrial & engineering chemistry research, Vol. 50 N° 21 (Novembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 21 (Novembre 2011) . - pp. 12276-12280 Titre : Degradation of cellulose in dilute aqueous solutions of acidic ionic liquid 1 - (1 - Propylsulfonic) - 3 - methylimidazolium chloride, and p - toluenesulfonic acid at moderate temperatures and pressures Type de document : texte imprimé Auteurs : Ananda S. Amarasekara, Auteur ; Bernard Wiredu, Auteur Année de publication : 2011 Article en page(s) : pp. 12276-12280 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Ionic  liquid  Aqueous  solution Résumé : Dilute aqueous solutions of 1-(1-propylsulfonic)-3-methylimidazolium chloride and p-toluenesulfonic acid are shown to be better catalysts than aqueous sulfuric acid of the same H+ ion concentration for the degradation of cellulose at moderate temperatures and pressures. For example, Sigmacell cellulose (DP ≈ 450) in aqueous solutions of 1-(1-propylsulfonic)-3-methylimidazolium chloride, p-toluenesulfonic acid, and sulfuric acid of the same acid strength (0.0321 mol H+ ion/L) produced total reducing sugar (TRS) yields of 28.5%, 32.6%, and 22.0%, respectively, after heating at 170 °C for 3.0 h. In the same set of experiments, glucose yields of 22.2%, 21.0%, and 16.2% were attained in 1-(1-propylsulfonic)-3-methylimidazolium chloride, p-toluenesulfonc acid, and sulfuric acid mediums, respectively. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24697547 [article] Degradation of cellulose in dilute aqueous solutions of acidic ionic liquid 1 - (1 - Propylsulfonic) - 3 - methylimidazolium chloride, and p - toluenesulfonic acid at moderate temperatures and pressures [texte imprimé] / Ananda S. Amarasekara, Auteur ; Bernard Wiredu, Auteur . - 2011 . - pp. 12276-12280. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 21 (Novembre 2011) . - pp. 12276-12280 Mots-clés : Ionic  liquid  Aqueous  solution Résumé : Dilute aqueous solutions of 1-(1-propylsulfonic)-3-methylimidazolium chloride and p-toluenesulfonic acid are shown to be better catalysts than aqueous sulfuric acid of the same H+ ion concentration for the degradation of cellulose at moderate temperatures and pressures. For example, Sigmacell cellulose (DP ≈ 450) in aqueous solutions of 1-(1-propylsulfonic)-3-methylimidazolium chloride, p-toluenesulfonic acid, and sulfuric acid of the same acid strength (0.0321 mol H+ ion/L) produced total reducing sugar (TRS) yields of 28.5%, 32.6%, and 22.0%, respectively, after heating at 170 °C for 3.0 h. In the same set of experiments, glucose yields of 22.2%, 21.0%, and 16.2% were attained in 1-(1-propylsulfonic)-3-methylimidazolium chloride, p-toluenesulfonc acid, and sulfuric acid mediums, respectively. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24697547

Hydrolysis and decomposition of cellulose in brönsted acidic ionic liquids under mild conditions / Ananda S. Amarasekara 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. 10152–10155 Titre : Hydrolysis and decomposition of cellulose in brönsted acidic ionic liquids under mild conditions Type de document : texte imprimé Auteurs : Ananda S. Amarasekara, Auteur ; Onome S. Owereh, Auteur Année de publication : 2010 Article en page(s) : pp. 10152–10155 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Brönsted  acidic  ionic  liquids  Cellulose  dissolves Résumé : Cellulose dissolves in Brönsted acidic ionic liquids 1-(1-propylsulfonic)-3-methylimidazolium chloride and 1-(1-butylsulfonic)-3-methylimidazolium chloride up to 20 g/100 g ionic liquid by gentle mixing at room temperature. Hydrolysis of cellulose can be carried out in these ionic liquid solutions by the addition of 2.0 equiv of water per glucose unit of cellulose and heating the solution at 70 °C and at atmospheric pressure with or without preheating to give glucose along with other reducing sugars. The hydrolysis of Sigmacell cellulose (DP ∼ 450) in 1-(1-propylsulfonic)-3-methylimidazolium chloride produced the highest total reducing sugar (62%) and glucose (14%) yields and was attained in 1 h of preheating at 70 °C and 30 min of heating at 70 °C, after adding water. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901047u [article] Hydrolysis and decomposition of cellulose in brönsted acidic ionic liquids under mild conditions [texte imprimé] / Ananda S. Amarasekara, Auteur ; Onome S. Owereh, Auteur . - 2010 . - pp. 10152–10155. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 22 (Novembre 2009) . - pp. 10152–10155 Mots-clés : Brönsted  acidic  ionic  liquids  Cellulose  dissolves Résumé : Cellulose dissolves in Brönsted acidic ionic liquids 1-(1-propylsulfonic)-3-methylimidazolium chloride and 1-(1-butylsulfonic)-3-methylimidazolium chloride up to 20 g/100 g ionic liquid by gentle mixing at room temperature. Hydrolysis of cellulose can be carried out in these ionic liquid solutions by the addition of 2.0 equiv of water per glucose unit of cellulose and heating the solution at 70 °C and at atmospheric pressure with or without preheating to give glucose along with other reducing sugars. The hydrolysis of Sigmacell cellulose (DP ∼ 450) in 1-(1-propylsulfonic)-3-methylimidazolium chloride produced the highest total reducing sugar (62%) and glucose (14%) yields and was attained in 1 h of preheating at 70 °C and 30 min of heating at 70 °C, after adding water. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901047u