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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

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

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) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 10040–10045 Titre : Rapid measurement of gas solubility in liquids using a membrane dispersion microcontactor Type de document : texte imprimé Auteurs : Jing Tan, Auteur ; Jianhong Xu, Auteur ; Kai Wang, Auteur Année de publication : 2011 Article en page(s) : pp. 10040–10045 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Dispersion  Solubility Résumé : In this study, we present a simple and fast method for the measurement of gas solubility in different liquids. Gas solubility measurements were carried out in a microcontactor using microdispersions to enhance mass transfer. The gas−liquid microcontactor, with a 5 μm pore size microfiltration membrane as the dispersion medium, was used to measure the gas solubility of six typical gas−liquid systems. The gas−liquid systems reached vapor−liquid equilibrium within 2 s, much less time than the 24 h required by the widely used static method of measurement. The obtained gas solubility data agree well with those obtained using the static method. The results produced using this measurement method were also highly reproducible, and relative measurement errors were less than 10% at the optimized operating conditions. The present method can potentially be very useful for the accurate and rapid measurement of gas solubility in many areas including gas−liquid reactions and solvent-based CO2 capture. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23325827 [article] Rapid measurement of gas solubility in liquids using a membrane dispersion microcontactor [texte imprimé] / Jing Tan, Auteur ; Jianhong Xu, Auteur ; Kai Wang, Auteur . - 2011 . - pp. 10040–10045. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 10040–10045 Mots-clés : Dispersion  Solubility Résumé : In this study, we present a simple and fast method for the measurement of gas solubility in different liquids. Gas solubility measurements were carried out in a microcontactor using microdispersions to enhance mass transfer. The gas−liquid microcontactor, with a 5 μm pore size microfiltration membrane as the dispersion medium, was used to measure the gas solubility of six typical gas−liquid systems. The gas−liquid systems reached vapor−liquid equilibrium within 2 s, much less time than the 24 h required by the widely used static method of measurement. The obtained gas solubility data agree well with those obtained using the static method. The results produced using this measurement method were also highly reproducible, and relative measurement errors were less than 10% at the optimized operating conditions. The present method can potentially be very useful for the accurate and rapid measurement of gas solubility in many areas including gas−liquid reactions and solvent-based CO2 capture. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23325827