Documents disponibles écrits par cet auteur

Analysis of membrane distillation crystallization system for high salinity brine treatment with zero discharge using aspen flowsheet simulation / Guoqiang Guan in Industrial & engineering chemistry research, Vol. 51 N° 41 (Octobre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 41 (Octobre 2012) . - pp. 13405-13413 Titre : Analysis of membrane distillation crystallization system for high salinity brine treatment with zero discharge using aspen flowsheet simulation Type de document : texte imprimé Auteurs : Guoqiang Guan, Auteur ; Rong Wang, Auteur ; Filicia Wicaksana, Auteur Année de publication : 2012 Article en page(s) : pp. 13405-13413 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Membrane  separation  Flowsheet  Brine  Crystallization  Membrane  distillation Résumé : An environmentally friendly membrane distillation crystallization (MDC) system is proposed to treat high salinity reverse osmosis (RO) brine with zero discharge. The raw brine from RO desalination plants is concentrated in direct contact MD to produce pure water, and the concentrate is then crystallized to produce solid salts without secondary disposal. A comprehensive analysis on the MDC system has been performed by Aspen flowsheet simulation with a user customized MD model, which was verified by our previous experiments. Simulation results reveal that the total energy consumption is negligibly changed by integration of a crystallization unit into the system, as over 97.8% of the energy was consumed by the heater of the MD subsystem. Higher inlet temperatures of both the feed and permeate streams in the MD module can improve the thermal efficiency. The introduction of a heat recovery unit in the MDC system, to recover the heat in the permeate for feed preheating, can increase the gain output ratio (GOR) by 28%. Moreover, it is shown that in a hollow fiber MD module, the permeate yield is a linear function of the length-to-radius ratio of the membrane module, and a longer MD module can reduce the specific energy consumption. A relatively high feed flow rate is preferred to avoid the potential problem of crystal blockage in the MD module. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26493634 [article] Analysis of membrane distillation crystallization system for high salinity brine treatment with zero discharge using aspen flowsheet simulation [texte imprimé] / Guoqiang Guan, Auteur ; Rong Wang, Auteur ; Filicia Wicaksana, Auteur . - 2012 . - pp. 13405-13413. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 41 (Octobre 2012) . - pp. 13405-13413 Mots-clés : Membrane  separation  Flowsheet  Brine  Crystallization  Membrane  distillation Résumé : An environmentally friendly membrane distillation crystallization (MDC) system is proposed to treat high salinity reverse osmosis (RO) brine with zero discharge. The raw brine from RO desalination plants is concentrated in direct contact MD to produce pure water, and the concentrate is then crystallized to produce solid salts without secondary disposal. A comprehensive analysis on the MDC system has been performed by Aspen flowsheet simulation with a user customized MD model, which was verified by our previous experiments. Simulation results reveal that the total energy consumption is negligibly changed by integration of a crystallization unit into the system, as over 97.8% of the energy was consumed by the heater of the MD subsystem. Higher inlet temperatures of both the feed and permeate streams in the MD module can improve the thermal efficiency. The introduction of a heat recovery unit in the MDC system, to recover the heat in the permeate for feed preheating, can increase the gain output ratio (GOR) by 28%. Moreover, it is shown that in a hollow fiber MD module, the permeate yield is a linear function of the length-to-radius ratio of the membrane module, and a longer MD module can reduce the specific energy consumption. A relatively high feed flow rate is preferred to avoid the potential problem of crystal blockage in the MD module. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26493634

Carboxymethyl chitosan-functionalized magnetic nanoparticles for disruption of biofilms of staphylococcus aureus and escherichia coli / Tong Chen 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. 13164-13172 Titre : Carboxymethyl chitosan-functionalized magnetic nanoparticles for disruption of biofilms of staphylococcus aureus and escherichia coli Type de document : texte imprimé Auteurs : Tong Chen, Auteur ; Rong Wang, Auteur ; Li Qun Xu, Auteur Année de publication : 2012 Article en page(s) : pp. 13164-13172 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Bacteria  Enterobacteriaceae  Escherichia  coli  Biofil  Disruption  Nanoparticle Résumé : Bacteria in biofilms are much more resistant to antibiotics and microbicides as compared to their planktonic stage. Thus, to achieve the same antibacterial efficacy, a much higher dose of antibiotics is required for-biofilm bacteria. However, the widespread use of antibiotics has been recognized as the main cause for the emergence of antibiotic-resistant microbial species, which has now become a major public health crisis globally. In this work, we present an efficient nonantibiotic-based strategy for disrupting biofilms using carboxymethyl chitosan (CMCS) coated on magnetic iron oxide nanoparticles (CMCS-MNPs). CMCS-MNPs demonstrate strong bactericidal activities against both Gram-positive Staphylococcus aureus (S. aureus) and Gram-negative Escherichia coli (E. coli) planktonic cells. More than 99% S. aureus and E. coli planktonic cells were killed after incubation with CMCS-MNPs for 10 and 5 h, respectively. In the presence of a magnetic field (MF), CMCS-MNPs can effectively penetrate into both S. aureus and E. coli biofilms, resulting in a reduction of viable cells counts by 84% and 95%, respectively, after 48 h incubation, as compared to the control experiment without CMCS-MNPs or CMCS. CMCS-MNPs are noncytotoxic toward mammalian cells and can potentially be a useful antimicrobial agent to eliminate both planktonic and biofilm bacteria. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26451466 [article] Carboxymethyl chitosan-functionalized magnetic nanoparticles for disruption of biofilms of staphylococcus aureus and escherichia coli [texte imprimé] / Tong Chen, Auteur ; Rong Wang, Auteur ; Li Qun Xu, Auteur . - 2012 . - pp. 13164-13172. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 40 (Octobre 2012) . - pp. 13164-13172 Mots-clés : Bacteria  Enterobacteriaceae  Escherichia  coli  Biofil  Disruption  Nanoparticle Résumé : Bacteria in biofilms are much more resistant to antibiotics and microbicides as compared to their planktonic stage. Thus, to achieve the same antibacterial efficacy, a much higher dose of antibiotics is required for-biofilm bacteria. However, the widespread use of antibiotics has been recognized as the main cause for the emergence of antibiotic-resistant microbial species, which has now become a major public health crisis globally. In this work, we present an efficient nonantibiotic-based strategy for disrupting biofilms using carboxymethyl chitosan (CMCS) coated on magnetic iron oxide nanoparticles (CMCS-MNPs). CMCS-MNPs demonstrate strong bactericidal activities against both Gram-positive Staphylococcus aureus (S. aureus) and Gram-negative Escherichia coli (E. coli) planktonic cells. More than 99% S. aureus and E. coli planktonic cells were killed after incubation with CMCS-MNPs for 10 and 5 h, respectively. In the presence of a magnetic field (MF), CMCS-MNPs can effectively penetrate into both S. aureus and E. coli biofilms, resulting in a reduction of viable cells counts by 84% and 95%, respectively, after 48 h incubation, as compared to the control experiment without CMCS-MNPs or CMCS. CMCS-MNPs are noncytotoxic toward mammalian cells and can potentially be a useful antimicrobial agent to eliminate both planktonic and biofilm bacteria. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26451466

Effect of methanol on catalytic performance of HY zeolite for desulfurization of FCC gasoline by alkylation / Rong Wang in Industrial & engineering chemistry research, Vol. 51 N° 18 (Mai 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 18 (Mai 2012) . - pp. 6320-6326 Titre : Effect of methanol on catalytic performance of HY zeolite for desulfurization of FCC gasoline by alkylation Type de document : texte imprimé Auteurs : Rong Wang, Auteur ; Yonghong Li, Auteur ; Benshuai Guo, Auteur Année de publication : 2012 Article en page(s) : pp. 6320-6326 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Alkylation  Desulfurization  Zeolite  Catalytic  reaction Résumé : Desulfurization of FCC gasoline by alkylation over a solid acid catalyst is considered to be a viable and less costly path to meet environmental regulations of sulfur emissions. However, side reactions in this process lead to significant levels of coke which greatly reduce the catalyst lifetime. In this paper, experiments were designed in both real and simulated gasoline to investigate the effect of different concentrations of methanol on the catalytic behavior of HY zeolite in the alkylation process for desulfurization. The result showed that the presence of an appropriate amount of methanol in FCC gasoline (about 5 wt % of the feed) appeared to improve the catalyst selectivity for the alkylation of thiophenic compounds by decreasing the conversion of olefins to oligomers, which was favorable for prolonging the catalyst lifetime. Moreover, a deep investigation was also carried out by a theoretical calculation method of DFT to explain the reason for the advantageous effect of methanol on the catalyst performance in the desulfurization process. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25867283 [article] Effect of methanol on catalytic performance of HY zeolite for desulfurization of FCC gasoline by alkylation [texte imprimé] / Rong Wang, Auteur ; Yonghong Li, Auteur ; Benshuai Guo, Auteur . - 2012 . - pp. 6320-6326. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 18 (Mai 2012) . - pp. 6320-6326 Mots-clés : Alkylation  Desulfurization  Zeolite  Catalytic  reaction Résumé : Desulfurization of FCC gasoline by alkylation over a solid acid catalyst is considered to be a viable and less costly path to meet environmental regulations of sulfur emissions. However, side reactions in this process lead to significant levels of coke which greatly reduce the catalyst lifetime. In this paper, experiments were designed in both real and simulated gasoline to investigate the effect of different concentrations of methanol on the catalytic behavior of HY zeolite in the alkylation process for desulfurization. The result showed that the presence of an appropriate amount of methanol in FCC gasoline (about 5 wt % of the feed) appeared to improve the catalyst selectivity for the alkylation of thiophenic compounds by decreasing the conversion of olefins to oligomers, which was favorable for prolonging the catalyst lifetime. Moreover, a deep investigation was also carried out by a theoretical calculation method of DFT to explain the reason for the advantageous effect of methanol on the catalyst performance in the desulfurization process. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25867283

Reduction of chemical reaction mechanism for halide-assisted silicon carbide epitaxial film deposition / Rong Wang in Industrial & engineering chemistry research, Vol. 48 N° 8 (Avril 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 8 (Avril 2009) . - pp. 3860–3866 Titre : Reduction of chemical reaction mechanism for halide-assisted silicon carbide epitaxial film deposition Type de document : texte imprimé Auteurs : Rong Wang, Auteur ; Ronghui Ma, Auteur ; Michael Dudley, Auteur Année de publication : 2009 Article en page(s) : pp. 3860–3866 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Gas-phase  composition  Halide-assisted  chemical  vapor  deposition  Silicon  carbide  film  growth  Three-dimensional  simulation Résumé : Simulation of gas-phase and surface chemistry is an essential part in numerical study of chemical vapor deposition for film growth. When integrated with a model for transport processes such as gas flow, heat transfer, and mass transfer, it allows the prediction of gas-phase composition, film deposition rate, and film uniformity. For halide-assisted chemical vapor deposition of silicon carbide film growth, three-dimensional simulation of the deposition process can be time-consuming due to the large number of chemical reactions involved. In this study, a simplified chemical reaction mechanism was developed for silicon carbide growth with silicon tetrachloride and propane as precursors. After model validation, the reduced reaction steps were implemented into a three-dimensional simulation of halide-assisted chemical vapor deposition to predict the distributions of gas velocity, temperature, concentration of the intermediate reactants, and film deposition rate. Specifically, the effects of deposition pressure on the film growth were investigated. The integrated model for chemistry and transport process demonstrated the capability of modeling a deposition process with reasonable computing time. We envision that this model will provide a useful tool for design, test, and optimization of the deposition process for growing silicon carbide films or bulk crystals by use of halide-assisted chemical vapor deposition process. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8017093 [article] Reduction of chemical reaction mechanism for halide-assisted silicon carbide epitaxial film deposition [texte imprimé] / Rong Wang, Auteur ; Ronghui Ma, Auteur ; Michael Dudley, Auteur . - 2009 . - pp. 3860–3866. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 8 (Avril 2009) . - pp. 3860–3866 Mots-clés : Gas-phase  composition  Halide-assisted  chemical  vapor  deposition  Silicon  carbide  film  growth  Three-dimensional  simulation Résumé : Simulation of gas-phase and surface chemistry is an essential part in numerical study of chemical vapor deposition for film growth. When integrated with a model for transport processes such as gas flow, heat transfer, and mass transfer, it allows the prediction of gas-phase composition, film deposition rate, and film uniformity. For halide-assisted chemical vapor deposition of silicon carbide film growth, three-dimensional simulation of the deposition process can be time-consuming due to the large number of chemical reactions involved. In this study, a simplified chemical reaction mechanism was developed for silicon carbide growth with silicon tetrachloride and propane as precursors. After model validation, the reduced reaction steps were implemented into a three-dimensional simulation of halide-assisted chemical vapor deposition to predict the distributions of gas velocity, temperature, concentration of the intermediate reactants, and film deposition rate. Specifically, the effects of deposition pressure on the film growth were investigated. The integrated model for chemistry and transport process demonstrated the capability of modeling a deposition process with reasonable computing time. We envision that this model will provide a useful tool for design, test, and optimization of the deposition process for growing silicon carbide films or bulk crystals by use of halide-assisted chemical vapor deposition process. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8017093