Documents disponibles écrits par cet auteur

Heat-transfer performance of a liquid-liquid microdispersed system / Kai Wang in Industrial & engineering chemistry research, Vol. 47 N° 23 (Décembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9754–9758 Titre : Heat-transfer performance of a liquid-liquid microdispersed system Type de document : texte imprimé Auteurs : Kai Wang, Auteur ; Yangcheng Lu, Auteur ; Huawei Shao, Auteur Année de publication : 2009 Article en page(s) : p. 9754–9758 Note générale : Chemistry engineering Langues : Anglais (eng) Mots-clés : Performance  Liquid-liquid  Microdispersed  system Résumé : In this work, the heat-transfer performance of liquid−liquid microdispersed systems was tested for the first time with a microdispersion contactor named a membrane dispersion minicontactor and octane/water as the working system. The volumetric heat-transfer coefficients ranging from 5 to 25 MW/(m3·°C) were obtained, which were 15−20 times higher than that of the conventional dispersion heat-transfer methods. The heat-transfer Murphree efficiencies, defined to evaluate the heat-transfer performance, reached 85−99% for the microdispersed system with residence times less than 0.1 s. By introducing the two parameters of Ca number and oil volumetric fraction, a semiempirical model for predicting the volumetric heat-transfer coefficient has been developed, which fits the experimental results very well. Furthermore, the similarity between the heat and mass transfer in the microdispersed system was demonstrated. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8005484 [article] Heat-transfer performance of a liquid-liquid microdispersed system [texte imprimé] / Kai Wang, Auteur ; Yangcheng Lu, Auteur ; Huawei Shao, Auteur . - 2009 . - p. 9754–9758. Chemistry engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9754–9758 Mots-clés : Performance  Liquid-liquid  Microdispersed  system Résumé : In this work, the heat-transfer performance of liquid−liquid microdispersed systems was tested for the first time with a microdispersion contactor named a membrane dispersion minicontactor and octane/water as the working system. The volumetric heat-transfer coefficients ranging from 5 to 25 MW/(m3·°C) were obtained, which were 15−20 times higher than that of the conventional dispersion heat-transfer methods. The heat-transfer Murphree efficiencies, defined to evaluate the heat-transfer performance, reached 85−99% for the microdispersed system with residence times less than 0.1 s. By introducing the two parameters of Ca number and oil volumetric fraction, a semiempirical model for predicting the volumetric heat-transfer coefficient has been developed, which fits the experimental results very well. Furthermore, the similarity between the heat and mass transfer in the microdispersed system was demonstrated. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8005484

Improving selectivity of temperature-sensitive exothermal reactions with microreactor / Kai Wang in Industrial & engineering chemistry research, Vol. 47 n°14 (Juillet 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4683–4688 Titre : Improving selectivity of temperature-sensitive exothermal reactions with microreactor Type de document : texte imprimé Auteurs : Kai Wang, Auteur ; Yangcheng Lu, Auteur ; Huawei Shao, Auteur ; Guangsheng Luo, Auteur Année de publication : 2008 Article en page(s) : p. 4683–4688 Note générale : Bibliogr. p. 4688 Langues : Anglais (eng) Mots-clés : Temperature-sensitive  exothermal  reaction;  Cyclohexanecarboxylic  acid;  Oleum Résumé : The selectivity of temperature-sensitive exothermal reaction, especially for a fast reaction system, is hard to control in chemical synthesis process. Traditionally, reducing the reaction temperature is applied to control byproduct. Nowadays, the confinement of the reaction temperature can be released by using microreactors. To demonstrate this, the fast exothermal reaction between cyclohexanecarboxylic acid and oleum was chosen as an experimental system in this work. An adiabatic micropore dispersion capillary reactor was developed to control the reaction selectivity at relatively high temperature. The results showed that 5−30 μm dispersed scale of oleum was reached in this microreactor, and nearly 100% selectivity was obtained at a relatively high product temperature, 50−60 °C, with 100% conversion of oleum. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800318q [article] Improving selectivity of temperature-sensitive exothermal reactions with microreactor [texte imprimé] / Kai Wang, Auteur ; Yangcheng Lu, Auteur ; Huawei Shao, Auteur ; Guangsheng Luo, Auteur . - 2008 . - p. 4683–4688. Bibliogr. p. 4688 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4683–4688 Mots-clés : Temperature-sensitive  exothermal  reaction;  Cyclohexanecarboxylic  acid;  Oleum Résumé : The selectivity of temperature-sensitive exothermal reaction, especially for a fast reaction system, is hard to control in chemical synthesis process. Traditionally, reducing the reaction temperature is applied to control byproduct. Nowadays, the confinement of the reaction temperature can be released by using microreactors. To demonstrate this, the fast exothermal reaction between cyclohexanecarboxylic acid and oleum was chosen as an experimental system in this work. An adiabatic micropore dispersion capillary reactor was developed to control the reaction selectivity at relatively high temperature. The results showed that 5−30 μm dispersed scale of oleum was reached in this microreactor, and nearly 100% selectivity was obtained at a relatively high product temperature, 50−60 °C, with 100% conversion of oleum. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800318q

Mixture absorption system of monoethanolamine — triethylene glycol for CO2 capture / Jing Tan in Industrial & engineering chemistry research, Vol. 50 N° 7 (Avril 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 7 (Avril 2011) . - pp. 3966-3976 Titre : Mixture absorption system of monoethanolamine — triethylene glycol for CO2 capture Type de document : texte imprimé Auteurs : Jing Tan, Auteur ; Huawei Shao, Auteur ; Jianhong Xu, Auteur Année de publication : 2011 Article en page(s) : pp. 3966-3976 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Carbon  dioxide Résumé : In this paper, a mixture system without water but composed of monoethanolamine (MEA) and triethylene glycol (TEG) is designed for CO2 capture. The solubility of CO2 in pure TEG and MEA-TEG solutions is determined, respectively, showing that the solubility of CO2 in TEG is generally consistent with Henry's Law and the value is higher than that in water. The solubility of CO2 in MEA―TEG solutions significantly increases with the increase of MEA, showing the characteristics of chemical reaction absorption. The absorption mechanism study shows that TEG does not act as a reaction agent. There is only one reaction between CO2 and MEA. The absence of water in the new system leads to the absence of dissociation of protonated MEA and formation of carbamate (MEACOO―). This is much different from the MEA―water system. A mathematical model is also developed for predicting the solubility of CO2 in the new system. The results show that the absorption and desorption can be realized at relatively lower temperatures (lower than 353.15 K), which may provide advancement in two aspects: low energy consumption with less solvent evaporation and avoidance of MEA's degradation caused by high-temperature operation. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24027643 [article] Mixture absorption system of monoethanolamine — triethylene glycol for CO2 capture [texte imprimé] / Jing Tan, Auteur ; Huawei Shao, Auteur ; Jianhong Xu, Auteur . - 2011 . - pp. 3966-3976. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 7 (Avril 2011) . - pp. 3966-3976 Mots-clés : Carbon  dioxide Résumé : In this paper, a mixture system without water but composed of monoethanolamine (MEA) and triethylene glycol (TEG) is designed for CO2 capture. The solubility of CO2 in pure TEG and MEA-TEG solutions is determined, respectively, showing that the solubility of CO2 in TEG is generally consistent with Henry's Law and the value is higher than that in water. The solubility of CO2 in MEA―TEG solutions significantly increases with the increase of MEA, showing the characteristics of chemical reaction absorption. The absorption mechanism study shows that TEG does not act as a reaction agent. There is only one reaction between CO2 and MEA. The absence of water in the new system leads to the absence of dissociation of protonated MEA and formation of carbamate (MEACOO―). This is much different from the MEA―water system. A mathematical model is also developed for predicting the solubility of CO2 in the new system. The results show that the absorption and desorption can be realized at relatively lower temperatures (lower than 353.15 K), which may provide advancement in two aspects: low energy consumption with less solvent evaporation and avoidance of MEA's degradation caused by high-temperature operation. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24027643