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Alkanolamine ionic liquids and their inability to dissolve crystalline cellulose / Andre Pinkert in Industrial & engineering chemistry research, Vol. 49 N° 22 (Novembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 22 (Novembre 2010) . - pp. 11809–11813 Titre : Alkanolamine ionic liquids and their inability to dissolve crystalline cellulose Type de document : texte imprimé Auteurs : Andre Pinkert, Auteur ; Kenneth N. Marsh, Auteur ; Shusheng Pang, Auteur Année de publication : 2011 Article en page(s) : pp. 11809–11813 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Ionic  liquids  Crystalline  Cellulose Résumé : The purpose of this research note is to report on the inability of alkanolammonium ionic liquids to dissolve crystalline cellulose, supporting the claims we make in an associated commentary paper, “Reflections on the Solubility of Cellulose” (Pinkert et al., Ind. Eng. Chem. Res. 2010, 49, DOI: 10.1021/ie1006596). Four organic acids (formic acid, acetic acid, malonic acid, and citric acid) and five amines (ethanolamine, diethanolamine, triethanolamine, propan-1-olamine, and diallylamine) were selected for the synthesis of 17 protic ionic liquids. The products were characterized by 1H nuclear magnetic resonance spectroscopy, infrared spectroscopy, thermogravimetric analysis, and Karl Fischer titration. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101250v [article] Alkanolamine ionic liquids and their inability to dissolve crystalline cellulose [texte imprimé] / Andre Pinkert, Auteur ; Kenneth N. Marsh, Auteur ; Shusheng Pang, Auteur . - 2011 . - pp. 11809–11813. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 22 (Novembre 2010) . - pp. 11809–11813 Mots-clés : Ionic  liquids  Crystalline  Cellulose Résumé : The purpose of this research note is to report on the inability of alkanolammonium ionic liquids to dissolve crystalline cellulose, supporting the claims we make in an associated commentary paper, “Reflections on the Solubility of Cellulose” (Pinkert et al., Ind. Eng. Chem. Res. 2010, 49, DOI: 10.1021/ie1006596). Four organic acids (formic acid, acetic acid, malonic acid, and citric acid) and five amines (ethanolamine, diethanolamine, triethanolamine, propan-1-olamine, and diallylamine) were selected for the synthesis of 17 protic ionic liquids. The products were characterized by 1H nuclear magnetic resonance spectroscopy, infrared spectroscopy, thermogravimetric analysis, and Karl Fischer titration. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101250v

Reflections on the solubility of cellulose / Andre Pinkert in Industrial & engineering chemistry research, Vol. 49 N° 22 (Novembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 22 (Novembre 2010) . - pp. 11121–11130 Titre : Reflections on the solubility of cellulose Type de document : texte imprimé Auteurs : Andre Pinkert, Auteur ; Kenneth N. Marsh, Auteur ; Shusheng Pang, Auteur Année de publication : 2011 Article en page(s) : pp. 11121–11130 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Cellulose  Biopolymers  Biofuels Résumé : Wood cellulose can be used for producing biofuels and biopolymers, thus offering a solution to global concerns on the excessive use of fossil fuels. This requires a cellulose solvent that also allows the ecofriendly processing of selective wood components. Some ionic liquids (ILs) have shown promising results as cellulose solvents with many advantages over traditional approaches. It is agreed that their ionic nature is responsible for cleaving hydrogen bonds between cellulose chains, resulting in dissolution of the biopolymer. However, it is still necessary to establish a structural relationship between IL cations and anions, which explains why only certain ion combinations show the ability to dissolve cellulose. This work aims to analyze the structural similarities displayed by common cellulose solvents focusing on requirements for ionic liquids to qualify as such. A mutual relationship between IL anions and cations is postulated that offers an explanation for the ability or disability of certain ion combinations to dissolve the biopolymer. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1006596 [article] Reflections on the solubility of cellulose [texte imprimé] / Andre Pinkert, Auteur ; Kenneth N. Marsh, Auteur ; Shusheng Pang, Auteur . - 2011 . - pp. 11121–11130. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 22 (Novembre 2010) . - pp. 11121–11130 Mots-clés : Cellulose  Biopolymers  Biofuels Résumé : Wood cellulose can be used for producing biofuels and biopolymers, thus offering a solution to global concerns on the excessive use of fossil fuels. This requires a cellulose solvent that also allows the ecofriendly processing of selective wood components. Some ionic liquids (ILs) have shown promising results as cellulose solvents with many advantages over traditional approaches. It is agreed that their ionic nature is responsible for cleaving hydrogen bonds between cellulose chains, resulting in dissolution of the biopolymer. However, it is still necessary to establish a structural relationship between IL cations and anions, which explains why only certain ion combinations show the ability to dissolve cellulose. This work aims to analyze the structural similarities displayed by common cellulose solvents focusing on requirements for ionic liquids to qualify as such. A mutual relationship between IL anions and cations is postulated that offers an explanation for the ability or disability of certain ion combinations to dissolve the biopolymer. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1006596