Documents disponibles écrits par cet auteur

Chlorohydrination of alyl chloride to dichloropropanol in a microchemical system / Jisong Zhang in Industrial & engineering chemistry research, Vol. 51 N° 45 (Novembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 45 (Novembre 2012) . - pp. 14685-14691 Titre : Chlorohydrination of alyl chloride to dichloropropanol in a microchemical system Type de document : texte imprimé Auteurs : Jisong Zhang, Auteur ; Jing Tan, Auteur ; Kai Wang, Auteur Année de publication : 2013 Article en page(s) : pp. 14685-14691 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Microchemical  system Résumé : A microchemical system, including two micromixers and a delay loop, is specially designed to carry out the chlorohydrination of allyl chloride with chlorine in water. Chlorine is dissolved in water in the first micromixer and then reacts with allyl chloride to produce dichloropropanol in the second micromixer. The reaction can be accomplished in the delay loop with a residence time less than 10 s and the selectivity higher than 98%. A multistage strategy which connects several microchemical units in series has been developed and demonstrated. The dichloropropanol concentration higher than 6 wt % with the selectivity higher than 96% can be successfully reached using this strategy. The results show that low temperature and high pressure could greatly improve the microreaction performance. In contrast to the conventional reaction process, the microreaction process has the advantages for higher yield, higher dichloropropanol concentration, less water waste, and lower energy consumption. Moreover, the new process could make the reaction process employing chlorine more controllable and safe. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301816k [article] Chlorohydrination of alyl chloride to dichloropropanol in a microchemical system [texte imprimé] / Jisong Zhang, Auteur ; Jing Tan, Auteur ; Kai Wang, Auteur . - 2013 . - pp. 14685-14691. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 45 (Novembre 2012) . - pp. 14685-14691 Mots-clés : Microchemical  system Résumé : A microchemical system, including two micromixers and a delay loop, is specially designed to carry out the chlorohydrination of allyl chloride with chlorine in water. Chlorine is dissolved in water in the first micromixer and then reacts with allyl chloride to produce dichloropropanol in the second micromixer. The reaction can be accomplished in the delay loop with a residence time less than 10 s and the selectivity higher than 98%. A multistage strategy which connects several microchemical units in series has been developed and demonstrated. The dichloropropanol concentration higher than 6 wt % with the selectivity higher than 96% can be successfully reached using this strategy. The results show that low temperature and high pressure could greatly improve the microreaction performance. In contrast to the conventional reaction process, the microreaction process has the advantages for higher yield, higher dichloropropanol concentration, less water waste, and lower energy consumption. Moreover, the new process could make the reaction process employing chlorine more controllable and safe. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301816k

Controllable preparation of SiO2 nanoparticles using a microfiltration membrane dispersion microreactor / Le Du in Industrial & engineering chemistry research, Vol. 50 N° 14 (Juillet 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 14 (Juillet 2011) . - pp. 8536-8541 Titre : Controllable preparation of SiO2 nanoparticles using a microfiltration membrane dispersion microreactor Type de document : texte imprimé Auteurs : Le Du, Auteur ; Jing Tan, Auteur ; Kai Wang, Auteur Année de publication : 2011 Article en page(s) : pp. 8536-8541 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Microreactor  Dispersion  Membrane  separation  Microfiltration  Nanoparticle  Preparation Résumé : The study presents a new technology for controllable preparation of SiO2 nanoparticles using a membrane dispersion microreactor. A gas―liquid precipitation reaction system was suggested for economics. (NH4)2SiF6 aqueous solution, a byproduct from wet-process phosphoric acid technology, was supplied as the reactant. Pure ammonia (NH3) was used as the precipitation agent. A microfiltation membrane with 0.2 μm pore size was used as the microdispersion medium to control the bubble size. The effect of various operation parameters on nanoparticles was determined, and the process was optimized. The SiO2 nanoparticles were characterized by X-ray powder diffraction, transmission electron microscopy, and Brunauer―Emmet―Teller analysis. The results showed that the preparation process could be easily controlled. The SiO2 nanoparticles were of a pseudospherical shape, the average particle size of which could vary from 10 to 150 nm. The particle size distribution was relatively narrow, and a specific surface area of around 360 m2/g was reached. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24346895 [article] Controllable preparation of SiO2 nanoparticles using a microfiltration membrane dispersion microreactor [texte imprimé] / Le Du, Auteur ; Jing Tan, Auteur ; Kai Wang, Auteur . - 2011 . - pp. 8536-8541. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 14 (Juillet 2011) . - pp. 8536-8541 Mots-clés : Microreactor  Dispersion  Membrane  separation  Microfiltration  Nanoparticle  Preparation Résumé : The study presents a new technology for controllable preparation of SiO2 nanoparticles using a membrane dispersion microreactor. A gas―liquid precipitation reaction system was suggested for economics. (NH4)2SiF6 aqueous solution, a byproduct from wet-process phosphoric acid technology, was supplied as the reactant. Pure ammonia (NH3) was used as the precipitation agent. A microfiltation membrane with 0.2 μm pore size was used as the microdispersion medium to control the bubble size. The effect of various operation parameters on nanoparticles was determined, and the process was optimized. The SiO2 nanoparticles were characterized by X-ray powder diffraction, transmission electron microscopy, and Brunauer―Emmet―Teller analysis. The results showed that the preparation process could be easily controlled. The SiO2 nanoparticles were of a pseudospherical shape, the average particle size of which could vary from 10 to 150 nm. The particle size distribution was relatively narrow, and a specific surface area of around 360 m2/g was reached. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24346895

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

Investigation of the performance of a high-temperature heat pump using parallel cycles with serial heating on the water side / Kai Wang in International journal of refrigeration, Vol. 33 N° 6 (Septembre 2010) 

Public ISBD [article]  in International journal of refrigeration > Vol. 33 N° 6 (Septembre 2010) . - pp. 1142-1151 Titre : Investigation of the performance of a high-temperature heat pump using parallel cycles with serial heating on the water side Titre original : Etude sur la performance d'une pompe à chaleur à température élevée employant des cycles parallèles avec chauffage en série du côté eau Type de document : texte imprimé Auteurs : Kai Wang, Auteur ; Feng Cao, Auteur ; Shouguo Wang, Auteur Année de publication : 2010 Article en page(s) : pp. 1142-1151 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Heat  pump  Screw  compressor  High  temperature  Design  Oil  injection  Thermodynamic  cycle  Calculation  Performance  Test-measurement Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : High-temperature heat pumps can be widely utilized for industrial heating as an energy-saving method due to their high condensing temperatures. This paper describes a cycle analysis and experimental study on the performance of a high-temperature heat pump (HTHP) system. The performance comparisons are conducted using performance calculations among the parallel cycles with serial heating on the water side, a two-stage compression cycle and a single-stage cycle. The results show that the performance of the heat pump using parallel cycles with serial heating is the best when the condensing temperature exceeds 75 °C. Based on the cycle analysis, a prototype HTHP using parallel cycles with serial heating on the water side with a heating capacity of 700 kW was built in this study. Also, a screw compressor was modified due to the high-temperature conditions. The measured performance shows that the HTHP can stably provide an outlet water temperature of up to 85 °C with a high coefficient of performance (COP). The experimental results indicate that the average heating capacity and coefficient of performance of the HTHP could be improved significantly in high-temperature conditions due to the parallel cycles with serial heating on the water side and the modified compressor. All the results indicate that the HTHP using parallel cycles and modified compressor with serial heating on the water side is very competitive in industrial heating applications. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000861 [article] Investigation of the performance of a high-temperature heat pump using parallel cycles with serial heating on the water side = Etude sur la performance d'une pompe à chaleur à température élevée employant des cycles parallèles avec chauffage en série du côté eau [texte imprimé] / Kai Wang, Auteur ; Feng Cao, Auteur ; Shouguo Wang, Auteur . - 2010 . - pp. 1142-1151. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 6 (Septembre 2010) . - pp. 1142-1151 Mots-clés : Heat  pump  Screw  compressor  High  temperature  Design  Oil  injection  Thermodynamic  cycle  Calculation  Performance  Test-measurement Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : High-temperature heat pumps can be widely utilized for industrial heating as an energy-saving method due to their high condensing temperatures. This paper describes a cycle analysis and experimental study on the performance of a high-temperature heat pump (HTHP) system. The performance comparisons are conducted using performance calculations among the parallel cycles with serial heating on the water side, a two-stage compression cycle and a single-stage cycle. The results show that the performance of the heat pump using parallel cycles with serial heating is the best when the condensing temperature exceeds 75 °C. Based on the cycle analysis, a prototype HTHP using parallel cycles with serial heating on the water side with a heating capacity of 700 kW was built in this study. Also, a screw compressor was modified due to the high-temperature conditions. The measured performance shows that the HTHP can stably provide an outlet water temperature of up to 85 °C with a high coefficient of performance (COP). The experimental results indicate that the average heating capacity and coefficient of performance of the HTHP could be improved significantly in high-temperature conditions due to the parallel cycles with serial heating on the water side and the modified compressor. All the results indicate that the HTHP using parallel cycles and modified compressor with serial heating on the water side is very competitive in industrial heating applications. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000861

Preparation and performance of polyimide-reinforced clay aerogel composites / Wei Wu in Industrial & engineering chemistry research, Vol. 51 N° 39 (Octobre 2012) 

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Rapid measurement of gas solubility in liquids using a membrane dispersion microcontactor / Jing Tan in Industrial & engineering chemistry research, Vol. 49 N° 20 (Octobre 2010) 

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Review of secondary loop refrigeration systems / Kai Wang in International journal of refrigeration, Vol. 33 N° 2 (Mars 2010) 

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