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Investigation on pyrolysis of microalgae botryococcus braunii and hapalosiphon sp. / Yong-Qiang Liu in Industrial & engineering chemistry research, Vol.51 N° 31 (Août 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol.51 N° 31 (Août 2012) . - pp. 10320-10326 Titre : Investigation on pyrolysis of microalgae botryococcus braunii and hapalosiphon sp. Type de document : texte imprimé Auteurs : Yong-Qiang Liu, Auteur ; Lingo R. X. Lim, Auteur ; Jin Wang, Auteur Année de publication : 2012 Article en page(s) : pp. 10320-10326 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Pyrolysis Résumé : In this study, the thermochemical characteristics of two types of microalgae, namely Hapalosiphon sp. and Botryococcus braunii, were investigated by use of a thermogravimetric analyzer. The low calorific value of Hapalosiphon sp. was 14.75 MJ kg―1, which is dose to that of sewage sludge or lignocellulosic biomass. However, the low calorific value of B. braunii was as high as 35.58 MJ kg―1 due to 89% of total C and H contents in biomass. Pyrolytic results indicated that the two microalgae had similar pyrolytic temperature ranges. In addition, with increased heating rates, the pyrolytic curves of the microalgae shifted to a higher temperature. However, derivative thermogravimetric (DTG) profiles of the two microalgae are distinct, which showed that different reactions were involved in the pyrolysis process. Hapalosiphon sp. has a lower mean activation energy than B. braunii in the pyrolysis process. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26234062 [article] Investigation on pyrolysis of microalgae botryococcus braunii and hapalosiphon sp. [texte imprimé] / Yong-Qiang Liu, Auteur ; Lingo R. X. Lim, Auteur ; Jin Wang, Auteur . - 2012 . - pp. 10320-10326. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol.51 N° 31 (Août 2012) . - pp. 10320-10326 Mots-clés : Pyrolysis Résumé : In this study, the thermochemical characteristics of two types of microalgae, namely Hapalosiphon sp. and Botryococcus braunii, were investigated by use of a thermogravimetric analyzer. The low calorific value of Hapalosiphon sp. was 14.75 MJ kg―1, which is dose to that of sewage sludge or lignocellulosic biomass. However, the low calorific value of B. braunii was as high as 35.58 MJ kg―1 due to 89% of total C and H contents in biomass. Pyrolytic results indicated that the two microalgae had similar pyrolytic temperature ranges. In addition, with increased heating rates, the pyrolytic curves of the microalgae shifted to a higher temperature. However, derivative thermogravimetric (DTG) profiles of the two microalgae are distinct, which showed that different reactions were involved in the pyrolysis process. Hapalosiphon sp. has a lower mean activation energy than B. braunii in the pyrolysis process. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26234062

Multivariate statistical process monitoring based on statistics pattern analysis / Jin Wang in Industrial & engineering chemistry research, Vol. 49 N° 17 (Septembre 1, 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 17 (Septembre 1, 2010) . - pp 7858–7869 Titre : Multivariate statistical process monitoring based on statistics pattern analysis Type de document : texte imprimé Auteurs : Jin Wang, Auteur ; Q. Peter He, Auteur Année de publication : 2010 Article en page(s) : pp 7858–7869 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Statistical  process  Pattern  analysis. Résumé : In this work, a new multivariate method to monitor continuous processes is developed based on the statistics pattern analysis (SPA) framework. The SPA framework was proposed recently to address some challenges associated with batch process monitoring, such as unsynchronized batch trajectories and multimodal distribution. The major difference between the principal component analysis (PCA) based and SPA-based fault detection methods is that PCA monitors process variables while SPA monitors the statistics of process variables. In other words, PCA examines the variance−covariance of the process variables to perform fault detection while SPA examines the variance−covariance of the process variable statistics (e.g., mean, variance, autocorrelation, cross-correlation, etc.) to perform fault detection. In this paper, a window-based SPA method is proposed to address the challenges associated with continuous processes such as nonlinear process dynamics. First, the details of the window-based SPA method are presented; then the basic properties of the SPA method for fault detection are discussed and illustrated using a simple nonlinear example. Finally, the potential of the window-based SPA method in monitoring continuous processes is explored using two case studies (a 2 × 2 linear dynamic process and the challenging Tennessee Eastman process). The performance of the window-based SPA method is compared with the benchmark PCA and DPCA methods. The monitoring results clearly demonstrate the superiority of the proposed method. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901911p [article] Multivariate statistical process monitoring based on statistics pattern analysis [texte imprimé] / Jin Wang, Auteur ; Q. Peter He, Auteur . - 2010 . - pp 7858–7869. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 17 (Septembre 1, 2010) . - pp 7858–7869 Mots-clés : Statistical  process  Pattern  analysis. Résumé : In this work, a new multivariate method to monitor continuous processes is developed based on the statistics pattern analysis (SPA) framework. The SPA framework was proposed recently to address some challenges associated with batch process monitoring, such as unsynchronized batch trajectories and multimodal distribution. The major difference between the principal component analysis (PCA) based and SPA-based fault detection methods is that PCA monitors process variables while SPA monitors the statistics of process variables. In other words, PCA examines the variance−covariance of the process variables to perform fault detection while SPA examines the variance−covariance of the process variable statistics (e.g., mean, variance, autocorrelation, cross-correlation, etc.) to perform fault detection. In this paper, a window-based SPA method is proposed to address the challenges associated with continuous processes such as nonlinear process dynamics. First, the details of the window-based SPA method are presented; then the basic properties of the SPA method for fault detection are discussed and illustrated using a simple nonlinear example. Finally, the potential of the window-based SPA method in monitoring continuous processes is explored using two case studies (a 2 × 2 linear dynamic process and the challenging Tennessee Eastman process). The performance of the window-based SPA method is compared with the benchmark PCA and DPCA methods. The monitoring results clearly demonstrate the superiority of the proposed method. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901911p

Optimization Design for DTB Industrial Crystallizer of Potassium Chloride / Xingfu Song in Industrial & engineering chemistry research, Vol. 49 N° 21 (Novembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 21 (Novembre 2010) . - pp. 10297-10302 Titre : Optimization Design for DTB Industrial Crystallizer of Potassium Chloride Type de document : texte imprimé Auteurs : Xingfu Song, Auteur ; Menghua Zhang, Auteur ; Jin Wang, Auteur Année de publication : 2011 Article en page(s) : pp. 10297-10302 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Crystallizer  Design  Optimization Résumé : A computational fluid dynamics (CFD) model was developed for the simulation and optimization of an existing continuous DTB crystallizer with KCl productivity of 0.1 million tons per year. The multiple reference frame (MRF) method was used in the CFD simulation. Both the hexagonal grid and the tetrahedral grid were adopted to divide meshes in this industrial DTB crystallizer, and in total 866 388 cells were used for CFD simulation. The fluid flow field in the DTB crystallizer was calculated using FLUENT6.3 software with the Reynolds-averaged Navier-Stokes equation combined with the widely used κ―ε turbulence model. The crystal size distribution and the coefficient of variation of crystal product were studied by CFD simulation of two-phase flow model. The impeller shapes and various operating conditions were optimized to reduce the energy consumption of the crystallization process and to increase the KCl product quality. Based on the CFD optimization design, a new impeller was retrofitted into an existing continuous DTB crystallizer with the KCl productivity of 0.1 million tons per year located at Qinghai salt lake plant in China, and its excellent performance was confirmed against data collected using the original impeller. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23447920 [article] Optimization Design for DTB Industrial Crystallizer of Potassium Chloride [texte imprimé] / Xingfu Song, Auteur ; Menghua Zhang, Auteur ; Jin Wang, Auteur . - 2011 . - pp. 10297-10302. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 21 (Novembre 2010) . - pp. 10297-10302 Mots-clés : Crystallizer  Design  Optimization Résumé : A computational fluid dynamics (CFD) model was developed for the simulation and optimization of an existing continuous DTB crystallizer with KCl productivity of 0.1 million tons per year. The multiple reference frame (MRF) method was used in the CFD simulation. Both the hexagonal grid and the tetrahedral grid were adopted to divide meshes in this industrial DTB crystallizer, and in total 866 388 cells were used for CFD simulation. The fluid flow field in the DTB crystallizer was calculated using FLUENT6.3 software with the Reynolds-averaged Navier-Stokes equation combined with the widely used κ―ε turbulence model. The crystal size distribution and the coefficient of variation of crystal product were studied by CFD simulation of two-phase flow model. The impeller shapes and various operating conditions were optimized to reduce the energy consumption of the crystallization process and to increase the KCl product quality. Based on the CFD optimization design, a new impeller was retrofitted into an existing continuous DTB crystallizer with the KCl productivity of 0.1 million tons per year located at Qinghai salt lake plant in China, and its excellent performance was confirmed against data collected using the original impeller. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23447920

Synthesis and properties of biodegradable poly(ester - co - carbonate) multiblock copolymers comprising of poly(butylene succinate) and poly(butylene carbonate) by chain extension / Jin Wang in Industrial & engineering chemistry research, Vol. 51 N° 33 (Août 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 33 (Août 2012) . - pp. 10785-10792 Titre : Synthesis and properties of biodegradable poly(ester - co - carbonate) multiblock copolymers comprising of poly(butylene succinate) and poly(butylene carbonate) by chain extension Type de document : texte imprimé Auteurs : Jin Wang, Auteur ; Liuchun Zheng, Auteur ; Chuncheng Li, Auteur Année de publication : 2012 Article en page(s) : pp. 10785-10792 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Properties  biodegradable  Copolymers Résumé : A series of biodegradable poly(ester-co-carbonate) multiblock copolymers consisting of poly(butylene succinate) and poly(butylene carbonate) (PBS-b-PBC) were synthesized successfully by chain-extension reaction of dihydroxyl terminated PBS-diol prepolymer and dihydroxyl terminated PBC-diol prepolymer using hexamethylene diisocyanate (HDI) as a chain extender. The chemical structures and molecular weights of copolymers were characterized by proton nuclear magnetic resonance (1H NMR) and gel permeation chromatography (GPC). The thermal properties, crystallization behavior, morphology and mechanical properties of PBS-b-PBC were investigated by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), phase-contrast optical microscopy (PCOM), and mechanical testing. It was found that the PBC soft segment is effective in enhancing the impact strength, while hardly decreases the melting point (Tm) of the copolymers. The resulting novel copolymers are expected to find a potential application in the area of biodegradable polymer materials. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300547g [article] Synthesis and properties of biodegradable poly(ester - co - carbonate) multiblock copolymers comprising of poly(butylene succinate) and poly(butylene carbonate) by chain extension [texte imprimé] / Jin Wang, Auteur ; Liuchun Zheng, Auteur ; Chuncheng Li, Auteur . - 2012 . - pp. 10785-10792. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 33 (Août 2012) . - pp. 10785-10792 Mots-clés : Properties  biodegradable  Copolymers Résumé : A series of biodegradable poly(ester-co-carbonate) multiblock copolymers consisting of poly(butylene succinate) and poly(butylene carbonate) (PBS-b-PBC) were synthesized successfully by chain-extension reaction of dihydroxyl terminated PBS-diol prepolymer and dihydroxyl terminated PBC-diol prepolymer using hexamethylene diisocyanate (HDI) as a chain extender. The chemical structures and molecular weights of copolymers were characterized by proton nuclear magnetic resonance (1H NMR) and gel permeation chromatography (GPC). The thermal properties, crystallization behavior, morphology and mechanical properties of PBS-b-PBC were investigated by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), phase-contrast optical microscopy (PCOM), and mechanical testing. It was found that the PBC soft segment is effective in enhancing the impact strength, while hardly decreases the melting point (Tm) of the copolymers. The resulting novel copolymers are expected to find a potential application in the area of biodegradable polymer materials. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300547g