Documents disponibles écrits par cet auteur

Decolorization of biopetroleum and analysis of colored components / Jinhua Li 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. 4924–4928 Titre : Decolorization of biopetroleum and analysis of colored components Type de document : texte imprimé Auteurs : Jinhua Li, Auteur ; Chao Wang, Auteur ; Zhengyu Yang, Auteur Année de publication : 2008 Article en page(s) : p. 4924–4928 Langues : Anglais (eng) Mots-clés : Biopetroleum;  Decolorization;  Distillation  fractions Résumé : Biopetroleum, mainly composed of alkanes, cycloalkanes, and aromatic hydrocarbons, was prepared from biomass by direct deoxyliquefaction. The distillation fractions were obtained after distilling at different temperatures and may become dark brown in color after storage in air. To produce a visually high-grade fuel, acid-activated bentonite was selected as the adsorbent to remove the color-induced components, such as unsaturated carbonyl groups, polycyclic aromatic hydrocarbons, quinones, heterocyclic and nitrous compounds, which can be determined by using GC/MS. The raw and acid-activated bentonites were characterized by X-ray diffraction (XRD), thermogravimetric analysis (TG) and Fourier transform infrared (FTIR) spectra, respectively. The colored distillation fractions were decolorized by acid-activated bentonite. The results showed that the acid-activated bentonite was effective in removing the color-induced components from the distillation fractions, and the maximum decolorization efficiency was 86.31%. The adsorption equilibrium data were fitted to the Freundlich isotherm equation. Moreover, the product treated by the acid-activated bentonite proved to be a high-grade fuel, which is similar to −10# diesel oil (freezing point ≤ −10 °C), not only in composition but also in color. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800101j [article] Decolorization of biopetroleum and analysis of colored components [texte imprimé] / Jinhua Li, Auteur ; Chao Wang, Auteur ; Zhengyu Yang, Auteur . - 2008 . - p. 4924–4928. Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4924–4928 Mots-clés : Biopetroleum;  Decolorization;  Distillation  fractions Résumé : Biopetroleum, mainly composed of alkanes, cycloalkanes, and aromatic hydrocarbons, was prepared from biomass by direct deoxyliquefaction. The distillation fractions were obtained after distilling at different temperatures and may become dark brown in color after storage in air. To produce a visually high-grade fuel, acid-activated bentonite was selected as the adsorbent to remove the color-induced components, such as unsaturated carbonyl groups, polycyclic aromatic hydrocarbons, quinones, heterocyclic and nitrous compounds, which can be determined by using GC/MS. The raw and acid-activated bentonites were characterized by X-ray diffraction (XRD), thermogravimetric analysis (TG) and Fourier transform infrared (FTIR) spectra, respectively. The colored distillation fractions were decolorized by acid-activated bentonite. The results showed that the acid-activated bentonite was effective in removing the color-induced components from the distillation fractions, and the maximum decolorization efficiency was 86.31%. The adsorption equilibrium data were fitted to the Freundlich isotherm equation. Moreover, the product treated by the acid-activated bentonite proved to be a high-grade fuel, which is similar to −10# diesel oil (freezing point ≤ −10 °C), not only in composition but also in color. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800101j

Direct deoxy-liquefaction of poplar leaves to biopetroleum with two kinds of catalysts / Libin Wu 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. 9248–9255 Titre : Direct deoxy-liquefaction of poplar leaves to biopetroleum with two kinds of catalysts Type de document : texte imprimé Auteurs : Libin Wu, Auteur ; Shipeng Guo, Auteur ; Chao Wang, Auteur Année de publication : 2009 Article en page(s) : p. 9248–9255 Note générale : Chemistry engineering Langues : Anglais (eng) Mots-clés : Deoxy-Liquefaction  Biopetroleum  Kinds  of  Catalysts Résumé : The objective of this study was to investigate the direct deoxy-liquefaction of poplar leaves with two kinds of catalysts (T203, Z409). The optimum conditions were found to be at a temperature of 623 K with 3% T203 and 5% Z409. The effect of these catalysts on the products was investigated, and the obtained results were compared with similar experiments without catalyst. The oil yield of 10.18% was obtained without catalyst and reached 12.22% with 3% T203. Higher oil yield of 16.18% was observed when 5% Z409 was used. The relative contents of hydrocarbons (alkanes and aromatics) were high to 42.91 and 55.89% when using 3% T203 and 5% Z409 as catalysts, and some light alkanes such as C7H16 and C8H18 were also detected in the oil. The most striking characteristics of the oils were that H/C > 1.75, oxygen content < 5.78%, and higher heating value > 44.33 MJ kg−1. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801129b [article] Direct deoxy-liquefaction of poplar leaves to biopetroleum with two kinds of catalysts [texte imprimé] / Libin Wu, Auteur ; Shipeng Guo, Auteur ; Chao Wang, Auteur . - 2009 . - p. 9248–9255. Chemistry engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9248–9255 Mots-clés : Deoxy-Liquefaction  Biopetroleum  Kinds  of  Catalysts Résumé : The objective of this study was to investigate the direct deoxy-liquefaction of poplar leaves with two kinds of catalysts (T203, Z409). The optimum conditions were found to be at a temperature of 623 K with 3% T203 and 5% Z409. The effect of these catalysts on the products was investigated, and the obtained results were compared with similar experiments without catalyst. The oil yield of 10.18% was obtained without catalyst and reached 12.22% with 3% T203. Higher oil yield of 16.18% was observed when 5% Z409 was used. The relative contents of hydrocarbons (alkanes and aromatics) were high to 42.91 and 55.89% when using 3% T203 and 5% Z409 as catalysts, and some light alkanes such as C7H16 and C8H18 were also detected in the oil. The most striking characteristics of the oils were that H/C > 1.75, oxygen content < 5.78%, and higher heating value > 44.33 MJ kg−1. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801129b

Experimental and numerical study of electronic module-cooling heat sinks used in a variable frequency air-conditioner outdoor unit / Xifeng Zhao in International journal of refrigeration, Vol. 38 (Février 2014) 

Public ISBD [article]  in International journal of refrigeration > Vol. 38 (Février 2014) . - pp. 10–21 Titre : Experimental and numerical study of electronic module-cooling heat sinks used in a variable frequency air-conditioner outdoor unit Titre original : Etude expérimentale et numérique de puits thermiques d'un système extérieur de conditionnement d'air à vitesse variable, utilisés pour le refroidissement de modules électroniques Type de document : texte imprimé Auteurs : Xifeng Zhao, Auteur ; Jinju Sun, Auteur ; Chao Wang, Auteur Année de publication : 2014 Article en page(s) : pp. 10–21 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Heat  sink;  Electronic  module  cooling;  Variable  frequency  air-conditioner;  Heat  transfer Résumé : In variable-frequency Air Conditioner (AC), sizes of frequency controlling electronic module and its supplemental heat sink are much restrained and they are also tightly packed. Heat removal in such a limited space is difficult, and effective and compact heat sinks are required. The study has focused on heat sink thermal performance with different geometries and configurations. To allow for interaction of heat sink and fan, both numerical and experimental investigations are conducted in a real AC outdoor unit environment. An increase in heat sink base area significantly improves its thermal performance; fin height and pitch influence convective surface and also sweeping stream behavior and a good compromise is needed to enhance convective heat transfer. A proper tuning of heat sink configuration is effective to improve convective stream and subsequently enhance thermal performance. Heat sink geometry and configuration produces insignificant influence on fan aerodynamic and aeroacoustic performance, and AC system performance. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713002533 [article] Experimental and numerical study of electronic module-cooling heat sinks used in a variable frequency air-conditioner outdoor unit = Etude expérimentale et numérique de puits thermiques d'un système extérieur de conditionnement d'air à vitesse variable, utilisés pour le refroidissement de modules électroniques [texte imprimé] / Xifeng Zhao, Auteur ; Jinju Sun, Auteur ; Chao Wang, Auteur . - 2014 . - pp. 10–21. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 38 (Février 2014) . - pp. 10–21 Mots-clés : Heat  sink;  Electronic  module  cooling;  Variable  frequency  air-conditioner;  Heat  transfer Résumé : In variable-frequency Air Conditioner (AC), sizes of frequency controlling electronic module and its supplemental heat sink are much restrained and they are also tightly packed. Heat removal in such a limited space is difficult, and effective and compact heat sinks are required. The study has focused on heat sink thermal performance with different geometries and configurations. To allow for interaction of heat sink and fan, both numerical and experimental investigations are conducted in a real AC outdoor unit environment. An increase in heat sink base area significantly improves its thermal performance; fin height and pitch influence convective surface and also sweeping stream behavior and a good compromise is needed to enhance convective heat transfer. A proper tuning of heat sink configuration is effective to improve convective stream and subsequently enhance thermal performance. Heat sink geometry and configuration produces insignificant influence on fan aerodynamic and aeroacoustic performance, and AC system performance. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713002533

Influences of pressure on the operation of reactive distillation columns involving kinetically controlled exothermic reactions / Chao Wang in Industrial & engineering chemistry research, Vol. 51 N° 9 (Mars 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3692-3708 Titre : Influences of pressure on the operation of reactive distillation columns involving kinetically controlled exothermic reactions Type de document : texte imprimé Auteurs : Chao Wang, Auteur ; Liang Zhang, Auteur ; Kejin Huang, Auteur Année de publication : 2012 Article en page(s) : pp. 3692-3708 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Exothermic  reaction  Distillation  column  Distillation  with  reaction Résumé : For the reactive distillation column involving a kinetically controlled exothermic reaction, operating pressure can present nonmonotonic influences on process dynamics and operation. While the enhancement of operating pressure benefits process dynamics and controllability in the lower part of its feasible region (which is confined by the temperature levels of the available cold and hot utilities), it turns to deteriorate process dynamics and controllability in the higher part of its feasible region. Three reactive distillation systems, including an ideal reactive distillation column performing a hypothetical exothermic reaction, A + Bkf⇄ kb C + D, and two real ones producing, respectively, methyl acetate from acetic acid and methanol and methyl tertiary butyl ether (MTBE) from isobutylene and methanol, are thoroughly studied in this work, and the results confirm the existence of this unique phenomenon. The intricate behavior of such kind of reactive distillation columns is essentially governed by the conflicting effects of operating pressure on reaction rate and chemical equilibrium constant and determines actually a favorable region of operating pressure for process dynamics and operation. Because the region may or may not coincide with the one in terms of process synthesis and design, operating pressure can therefore serve as an important decision variable to trade-off process design and operation, rendering the resultant process design with balanced steady-state performance and process dynamics and controllability. ISSN : 0888 -5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595798 [article] Influences of pressure on the operation of reactive distillation columns involving kinetically controlled exothermic reactions [texte imprimé] / Chao Wang, Auteur ; Liang Zhang, Auteur ; Kejin Huang, Auteur . - 2012 . - pp. 3692-3708. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3692-3708 Mots-clés : Exothermic  reaction  Distillation  column  Distillation  with  reaction Résumé : For the reactive distillation column involving a kinetically controlled exothermic reaction, operating pressure can present nonmonotonic influences on process dynamics and operation. While the enhancement of operating pressure benefits process dynamics and controllability in the lower part of its feasible region (which is confined by the temperature levels of the available cold and hot utilities), it turns to deteriorate process dynamics and controllability in the higher part of its feasible region. Three reactive distillation systems, including an ideal reactive distillation column performing a hypothetical exothermic reaction, A + Bkf⇄ kb C + D, and two real ones producing, respectively, methyl acetate from acetic acid and methanol and methyl tertiary butyl ether (MTBE) from isobutylene and methanol, are thoroughly studied in this work, and the results confirm the existence of this unique phenomenon. The intricate behavior of such kind of reactive distillation columns is essentially governed by the conflicting effects of operating pressure on reaction rate and chemical equilibrium constant and determines actually a favorable region of operating pressure for process dynamics and operation. Because the region may or may not coincide with the one in terms of process synthesis and design, operating pressure can therefore serve as an important decision variable to trade-off process design and operation, rendering the resultant process design with balanced steady-state performance and process dynamics and controllability. ISSN : 0888 -5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595798

Kinetic parameters estimation in the polymerase chain reaction process using the genetic algorithm / Lanting Li in Industrial & engineering chemistry research, Vol. 51 N° 40 (Octobre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 40 (Octobre 2012) . - pp. 13268-13273 Titre : Kinetic parameters estimation in the polymerase chain reaction process using the genetic algorithm Type de document : texte imprimé Auteurs : Lanting Li, Auteur ; Chao Wang, Auteur ; Bo Song, Auteur Année de publication : 2012 Article en page(s) : pp. 13268-13273 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Genetic  algorithm  Polymerase  chain  reaction  Parameter  estimationKinetic  parameter Résumé : Analyzing the polymerase chain reaction (PCR) process by mathematical modelling is of importance in terms of uncovering the dynamic mechanism of PCR and predicting DNA amplification performance. Construction of an ideal PCR model, however, requires sufficient and accurate kinetic parameters, which cannot be easily obtained directly from experimental data. In this work, a genetic algorithm-based approach was introduced for optimizing kinetic parameters of PCR such as the rate constant of polymerase catalyst reaction. The fitted model agrees well with experimental data and predicts the DNA amplification yields as a function of cycle number. The kinetic parameters are not dependent on initial concentrations or the fragment types of DNA amplification. The model also allows us to predict the threshold cycle in real-time PCR, which is helpful for estimating the initial amount of DNA template and determining the optimal PCR reaction conditions. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26451477 [article] Kinetic parameters estimation in the polymerase chain reaction process using the genetic algorithm [texte imprimé] / Lanting Li, Auteur ; Chao Wang, Auteur ; Bo Song, Auteur . - 2012 . - pp. 13268-13273. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 40 (Octobre 2012) . - pp. 13268-13273 Mots-clés : Genetic  algorithm  Polymerase  chain  reaction  Parameter  estimationKinetic  parameter Résumé : Analyzing the polymerase chain reaction (PCR) process by mathematical modelling is of importance in terms of uncovering the dynamic mechanism of PCR and predicting DNA amplification performance. Construction of an ideal PCR model, however, requires sufficient and accurate kinetic parameters, which cannot be easily obtained directly from experimental data. In this work, a genetic algorithm-based approach was introduced for optimizing kinetic parameters of PCR such as the rate constant of polymerase catalyst reaction. The fitted model agrees well with experimental data and predicts the DNA amplification yields as a function of cycle number. The kinetic parameters are not dependent on initial concentrations or the fragment types of DNA amplification. The model also allows us to predict the threshold cycle in real-time PCR, which is helpful for estimating the initial amount of DNA template and determining the optimal PCR reaction conditions. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26451477