Documents disponibles écrits par cet auteur

Effect of H2O on the desulfurization of simulated flue gas by an ionic liquid / Shuhang Ren in Industrial & engineering chemistry research, Vol. 48 N° 10 (Mai 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 10 (Mai 2009) . - pp. 4928–4932 Titre : Effect of H2O on the desulfurization of simulated flue gas by an ionic liquid Type de document : texte imprimé Auteurs : Shuhang Ren, Auteur ; Yucui Hou, Auteur ; Weize Wu, Auteur Année de publication : 2009 Article en page(s) : pp. 4928–4932 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Ionic  liquids  SO2  Large-scale  desulfurization  Mixed  gases Résumé : Functionalized ionic liquids (ILs) have been demonstrated to absorb SO2 from mixed gases or simulated flue gases efficiently. However, after absorbing a large amount of SO2, the viscosity of the ILs increases greatly, which might limit their eventual applications in large-scale desulfurization from mixed gases or flue gases. In this work, the effect of the presence of water in a simulated flue gas on the absorption of SO2 by a functionalized ionic liquid, 1,1,3,3-tetramethylguanidinium lactate, has been studied at different temperatures. It is found that the presence of water in the simulated flue gas can decrease the viscosity of the IL greatly, and it has no effect on the absorptivity of SO2 from the flue gas. The densities of the IL absorbing SO2 from the flue gas with or without water are also studied. They increase with the increase of the amount of SO2 absorbed from the flue gas in both cases. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9000844 [article] Effect of H2O on the desulfurization of simulated flue gas by an ionic liquid [texte imprimé] / Shuhang Ren, Auteur ; Yucui Hou, Auteur ; Weize Wu, Auteur . - 2009 . - pp. 4928–4932. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 10 (Mai 2009) . - pp. 4928–4932 Mots-clés : Ionic  liquids  SO2  Large-scale  desulfurization  Mixed  gases Résumé : Functionalized ionic liquids (ILs) have been demonstrated to absorb SO2 from mixed gases or simulated flue gases efficiently. However, after absorbing a large amount of SO2, the viscosity of the ILs increases greatly, which might limit their eventual applications in large-scale desulfurization from mixed gases or flue gases. In this work, the effect of the presence of water in a simulated flue gas on the absorption of SO2 by a functionalized ionic liquid, 1,1,3,3-tetramethylguanidinium lactate, has been studied at different temperatures. It is found that the presence of water in the simulated flue gas can decrease the viscosity of the IL greatly, and it has no effect on the absorptivity of SO2 from the flue gas. The densities of the IL absorbing SO2 from the flue gas with or without water are also studied. They increase with the increase of the amount of SO2 absorbed from the flue gas in both cases. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9000844

Efficient conversion of cellulose to glucose, levulinic acid, and other products in hot water using SO2 as a recoverable catalyst / Weina Liu in Industrial & engineering chemistry research, Vol. 51 N° 47 (Novembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15503-15508 Titre : Efficient conversion of cellulose to glucose, levulinic acid, and other products in hot water using SO2 as a recoverable catalyst Type de document : texte imprimé Auteurs : Weina Liu, Auteur ; Yucui Hou, Auteur ; Weize Wu, Auteur Année de publication : 2013 Article en page(s) : pp. 15503-15508 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Catalyst  Hot  water Résumé : Cellulose is the most widely distributed source of biomass, and its efficient conversion to a variety of chemicals is important for a sustainable future. In this work, sulfur dioxide (SO2) dissolved in hot water has been demonstrated to be an efficient catalyst for the selective conversion of cellulose to chemicals such as glucose and levulinic acid. The selectivity of products can be tuned by the SO2 concentration, temperature, and reaction time. SO2 acts both as a supply of H+ ions through ionization of H2SO3 when dissolved in water and as a Lewis acid catalyst that breaks the hydrogen bonds in cellulose. Importantly, SO2 in the reaction mixture can be recovered completely by stream stripping, thus avoiding the formation of acidic wastewater. This work provides a new, efficient, and environmentally benign way to convert cellulose to chemicals. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679671 [article] Efficient conversion of cellulose to glucose, levulinic acid, and other products in hot water using SO2 as a recoverable catalyst [texte imprimé] / Weina Liu, Auteur ; Yucui Hou, Auteur ; Weize Wu, Auteur . - 2013 . - pp. 15503-15508. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15503-15508 Mots-clés : Catalyst  Hot  water Résumé : Cellulose is the most widely distributed source of biomass, and its efficient conversion to a variety of chemicals is important for a sustainable future. In this work, sulfur dioxide (SO2) dissolved in hot water has been demonstrated to be an efficient catalyst for the selective conversion of cellulose to chemicals such as glucose and levulinic acid. The selectivity of products can be tuned by the SO2 concentration, temperature, and reaction time. SO2 acts both as a supply of H+ ions through ionization of H2SO3 when dissolved in water and as a Lewis acid catalyst that breaks the hydrogen bonds in cellulose. Importantly, SO2 in the reaction mixture can be recovered completely by stream stripping, thus avoiding the formation of acidic wastewater. This work provides a new, efficient, and environmentally benign way to convert cellulose to chemicals. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679671

Production of benzene polycarboxylic acids from lignite by alkali-oxygen oxidation / Wenhua Wang in Industrial & engineering chemistry research, Vol. 51 N° 46 (Novembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 46 (Novembre 2012) . - pp. 14994–15003 Titre : Production of benzene polycarboxylic acids from lignite by alkali-oxygen oxidation Type de document : texte imprimé Auteurs : Wenhua Wang, Auteur ; Yucui Hou, Auteur ; Weize Wu, Auteur Année de publication : 2013 Article en page(s) : pp. 14994–15003 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Polycarboxylic  Acids Résumé : The oxidation of coal to produce high-valued benzene polycarboxylic acids (BPCAs), which are obtained currently from diminishing petroleum reserves, is a promising industrial process of the future. Up to now, the yield distribution of BPCAs has not been studied in detail and the mechanism of coal oxidation to BPCAs remains unclear. In this study, Huolinhe lignite was oxidized in a batch reactor by alkali-oxygen oxidation. All 12 kinds of BPCAs obtained were quantified by a new established method. Effects of alkali/coal mass ratio, reaction temperature, initial oxygen pressure, and reaction time on the yield distribution of BPCAs were studied for the first time. The results indicate that BPCAs with four or five carboxyls are the predominant products, and BPCAs with one or two carboxyls are formed in a relatively short time; moreover, the formation of BPCAs with more carboxyls is relatively more sensitive to the salting out effect. CP/MAS 13C NMR spectra and oxidation of model compounds show that phenolic, ether-substituted aromatic, ether, and aldehyde groups are easily converted and that water-soluble acids (WSA) are formed rapidly and largely due to the breakage of these bonds. The step from WSA to BPCAs is relatively slow mainly due to the inertia of the aromatic clusters with attached carboxyls or carboxylate. On the whole, the BPCAs are derived from aromatic clusters through the oxidation of condensed benzene rings, bridges, or peripheral groups that are attached to the aromatic clusters. Possible mother units for BPCAs in the lignite are suggested based on the generally agreed lignite structure. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3021297 [article] Production of benzene polycarboxylic acids from lignite by alkali-oxygen oxidation [texte imprimé] / Wenhua Wang, Auteur ; Yucui Hou, Auteur ; Weize Wu, Auteur . - 2013 . - pp. 14994–15003. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 46 (Novembre 2012) . - pp. 14994–15003 Mots-clés : Polycarboxylic  Acids Résumé : The oxidation of coal to produce high-valued benzene polycarboxylic acids (BPCAs), which are obtained currently from diminishing petroleum reserves, is a promising industrial process of the future. Up to now, the yield distribution of BPCAs has not been studied in detail and the mechanism of coal oxidation to BPCAs remains unclear. In this study, Huolinhe lignite was oxidized in a batch reactor by alkali-oxygen oxidation. All 12 kinds of BPCAs obtained were quantified by a new established method. Effects of alkali/coal mass ratio, reaction temperature, initial oxygen pressure, and reaction time on the yield distribution of BPCAs were studied for the first time. The results indicate that BPCAs with four or five carboxyls are the predominant products, and BPCAs with one or two carboxyls are formed in a relatively short time; moreover, the formation of BPCAs with more carboxyls is relatively more sensitive to the salting out effect. CP/MAS 13C NMR spectra and oxidation of model compounds show that phenolic, ether-substituted aromatic, ether, and aldehyde groups are easily converted and that water-soluble acids (WSA) are formed rapidly and largely due to the breakage of these bonds. The step from WSA to BPCAs is relatively slow mainly due to the inertia of the aromatic clusters with attached carboxyls or carboxylate. On the whole, the BPCAs are derived from aromatic clusters through the oxidation of condensed benzene rings, bridges, or peripheral groups that are attached to the aromatic clusters. Possible mother units for BPCAs in the lignite are suggested based on the generally agreed lignite structure. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3021297

Solubility of glucose in ionic liquid + antisolvent mixtures / Weina Liu in Industrial & engineering chemistry research, Vol. 50 N° 11 (Juin 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 11 (Juin 2011) . - pp. 6952-6956 Titre : Solubility of glucose in ionic liquid + antisolvent mixtures Type de document : texte imprimé Auteurs : Weina Liu, Auteur ; Yucui Hou, Auteur ; Weize Wu, Auteur Année de publication : 2011 Article en page(s) : pp. 6952-6956 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Ionic  liquid  Solubility Résumé : An extended study on the solubility of glucose in ionic liquid (IL) + antisolvent mixtures has been performed to find a way to separate glucose from ILs. These Ils, commonly used in cellulose conversion processes, are based on combination of cations of I-methyl-3-alkylimidazolium and anions of chloride, bromide, acetate, and hydrogen sulfate. Effects of temperatures, antisolvents, ILs, mass ratios of antisolvent to IL, and water contents on the solubility of glucose have been investigated in this work. The results demonstrate that the solubility of glucose increases with decreasing mass ratio of antisolvent to IL and elevating temperatures. The solubility of glucose in IL + ethanol mixtures increases in the following order: [emim][Br], [bmim][Cl], [bmim][HSO4], [bmim][CH3COO], and [emim] [CH3COO]. The addition of water can increase the solubility of glucose in IL + antisolvent mixtures. Ethanol can be selected as a better antisolvent to separate glucose from IL than methanol, acetone, and acetonitrile. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24199913 [article] Solubility of glucose in ionic liquid + antisolvent mixtures [texte imprimé] / Weina Liu, Auteur ; Yucui Hou, Auteur ; Weize Wu, Auteur . - 2011 . - pp. 6952-6956. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 11 (Juin 2011) . - pp. 6952-6956 Mots-clés : Ionic  liquid  Solubility Résumé : An extended study on the solubility of glucose in ionic liquid (IL) + antisolvent mixtures has been performed to find a way to separate glucose from ILs. These Ils, commonly used in cellulose conversion processes, are based on combination of cations of I-methyl-3-alkylimidazolium and anions of chloride, bromide, acetate, and hydrogen sulfate. Effects of temperatures, antisolvents, ILs, mass ratios of antisolvent to IL, and water contents on the solubility of glucose have been investigated in this work. The results demonstrate that the solubility of glucose increases with decreasing mass ratio of antisolvent to IL and elevating temperatures. The solubility of glucose in IL + ethanol mixtures increases in the following order: [emim][Br], [bmim][Cl], [bmim][HSO4], [bmim][CH3COO], and [emim] [CH3COO]. The addition of water can increase the solubility of glucose in IL + antisolvent mixtures. Ethanol can be selected as a better antisolvent to separate glucose from IL than methanol, acetone, and acetonitrile. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24199913