Documents disponibles écrits par cet auteur

Block copolymer derived membranes for sustained carbon dioxide − methane separations / Sarah E. Querelle in Industrial & engineering chemistry research, Vol. 49 N° 23 (Décembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 23 (Décembre 2010) . - pp. 12051–12059 Titre : Block copolymer derived membranes for sustained carbon dioxide − methane separations Type de document : texte imprimé Auteurs : Sarah E. Querelle, Auteur ; Chen, Liang, Auteur ; Marc A. Hillmyer, Auteur Année de publication : 2011 Article en page(s) : pp. 12051–12059 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Polymer Résumé : Using a reactive block polymer precursor, membranes with a bicontinuous nanostructure containing a poly((N,N-dimethylamino)ethyl methacrylate) phase within a cross-linked poly(cyclooctene) framework were formed. These membranes were evaluated for their CO2 selectivity over CH4. Low pressure experiments demonstrated that the CO2 and CH4 permeabilities remain the same with pure and mixed gas feeds. This shows that the membranes are able to maintain their selectivity for CO2. This selectivity was only slightly decreased at moderate temperature (35 °C) and higher pressures (up to 40 bar) using a 50/50 CO2/CH4 mixed gas feed. The bicontinuous block polymer membranes resist the plasticization effect by using a cross-linked phase to sustain the properties of the selective block, and not by changing chain mobility through new chemistry. These bicontinuous block polymer membranes may be valuable for CO2 removal from natural gas streams. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100461k [article] Block copolymer derived membranes for sustained carbon dioxide − methane separations [texte imprimé] / Sarah E. Querelle, Auteur ; Chen, Liang, Auteur ; Marc A. Hillmyer, Auteur . - 2011 . - pp. 12051–12059. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 23 (Décembre 2010) . - pp. 12051–12059 Mots-clés : Polymer Résumé : Using a reactive block polymer precursor, membranes with a bicontinuous nanostructure containing a poly((N,N-dimethylamino)ethyl methacrylate) phase within a cross-linked poly(cyclooctene) framework were formed. These membranes were evaluated for their CO2 selectivity over CH4. Low pressure experiments demonstrated that the CO2 and CH4 permeabilities remain the same with pure and mixed gas feeds. This shows that the membranes are able to maintain their selectivity for CO2. This selectivity was only slightly decreased at moderate temperature (35 °C) and higher pressures (up to 40 bar) using a 50/50 CO2/CH4 mixed gas feed. The bicontinuous block polymer membranes resist the plasticization effect by using a cross-linked phase to sustain the properties of the selective block, and not by changing chain mobility through new chemistry. These bicontinuous block polymer membranes may be valuable for CO2 removal from natural gas streams. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100461k

Exploring the essence of three-phase packed distillation / Chen, Liang in Industrial & engineering chemistry research, Vol. 49 N° 2 (Janvier 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 2 (Janvier 2010) . - pp 822–837 Titre : Exploring the essence of three-phase packed distillation : substantial mass transfer computation Type de document : texte imprimé Auteurs : Chen, Liang, Auteur ; Jens-Uwe Repke, Auteur ; Günter Wozny, Auteur Année de publication : 2010 Article en page(s) : pp 822–837 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Essence  Mass  transfer  Vapor  Liquid. Résumé : Three-phase packed distillation has been so far relatively poorly understood. Hence, a substantial mass transfer model describing the (vapor−liquid−liquid) three-phase flow in packed column is proposed to explore the essence of three-phase distillation. The model enables, for the first time, rigorous computation of all the interphase transfer parameters on the basis of a thorough consideration of the unique flow behaviors (such as film breakup, rivulet-flow, surface variation, etc.) caused by the second liquid. The derived theoretical mass transfer model has been incorporated into the three-phase nonequilibrium simulation. Moreover, comprehensive experimental investigations have been carried out using two laboratory-scale columns, and four different packings (Montz-Pak B1-350, Rombopak 9M, Raschig Super-Ring 0.3, and Sulzer Optiflow C.36) were considered. The derived experimental database, covering a wide range of load conditions, is used for flow pattern identification and model validation. For the studied n-butanol/water/n-propanol system, it is revealed that the flow pattern of the second liquid (aqueous phase) could play a critical role in the system performance. When the second liquid flows below the first liquid film, it will enlarge the interfacial area and enhance the vapor−liquid mass transfer; when the second liquid flows above the first liquid film, it will reduce the interfacial area and degrade the mass transfer. This fundamental flow behavior may essentially result in the discrepancy existing in the highly variable separation efficiencies in three-phase packed columns. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9010645 [article] Exploring the essence of three-phase packed distillation : substantial mass transfer computation [texte imprimé] / Chen, Liang, Auteur ; Jens-Uwe Repke, Auteur ; Günter Wozny, Auteur . - 2010 . - pp 822–837. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 2 (Janvier 2010) . - pp 822–837 Mots-clés : Essence  Mass  transfer  Vapor  Liquid. Résumé : Three-phase packed distillation has been so far relatively poorly understood. Hence, a substantial mass transfer model describing the (vapor−liquid−liquid) three-phase flow in packed column is proposed to explore the essence of three-phase distillation. The model enables, for the first time, rigorous computation of all the interphase transfer parameters on the basis of a thorough consideration of the unique flow behaviors (such as film breakup, rivulet-flow, surface variation, etc.) caused by the second liquid. The derived theoretical mass transfer model has been incorporated into the three-phase nonequilibrium simulation. Moreover, comprehensive experimental investigations have been carried out using two laboratory-scale columns, and four different packings (Montz-Pak B1-350, Rombopak 9M, Raschig Super-Ring 0.3, and Sulzer Optiflow C.36) were considered. The derived experimental database, covering a wide range of load conditions, is used for flow pattern identification and model validation. For the studied n-butanol/water/n-propanol system, it is revealed that the flow pattern of the second liquid (aqueous phase) could play a critical role in the system performance. When the second liquid flows below the first liquid film, it will enlarge the interfacial area and enhance the vapor−liquid mass transfer; when the second liquid flows above the first liquid film, it will reduce the interfacial area and degrade the mass transfer. This fundamental flow behavior may essentially result in the discrepancy existing in the highly variable separation efficiencies in three-phase packed columns. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9010645

Extension of the mass transfer calculation for three-phase distillation in a packed column / Chen, Liang in Industrial & engineering chemistry research, Vol. 48 N° 15 (Août 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 15 (Août 2009) . - pp. 7289–7300 Titre : Extension of the mass transfer calculation for three-phase distillation in a packed column : nonequilibrium model based parameter estimation Type de document : texte imprimé Auteurs : Chen, Liang, Auteur ; Jens-Uwe Repke, Auteur ; Günter Wozny, Auteur Année de publication : 2009 Article en page(s) : pp. 7289–7300 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Nonequilibrium  modeling  Three-phase  distillation  Packed  column Résumé : Nonequilibrium (NEQ) modeling of three-phase (vapor−liquid−liquid) distillation in a packed column is still lacking of reliable correlations to calculate the interphase rate-based mass transfer. In this paper, extensions of the two most-used correlations [i.e., the Rocha correlation (Rocha, J. A.; Bravo, J. L.; Fair, J. R. Distillation Columns Containing Structured Packings: A Comprehensive Model for Their Performance. 2. Mass-Transfer Model. Ind. Eng. Chem. Res. 1996, 35, 1660) and the Billet and Schultes correlation (Billet, R.; Schultes, M. Prediction of Mass Transfer Columns with Dumped and Arranged Packings: Updated Summary of the Calculation Method of Billet & Schultes. Chem. Eng. Res. Des. 1999, 77, 498)] are proposed for mass transfer calculation of three-phase distillation in a packed column. Parameters used in the correlations are estimated on the basis of comprehensive experimental investigations on both two-phase (vapor−liquid) and three-phase distillation. The experimental database contains 150 different experiments of the 1-butanol/water/1-propanol system for different packings (Montz-Pak B1-350, Raschig Super-Ring 0.3, Rombopak 9M). The parameter estimation with multiple data sets and multipacking turns out to be a large-scale optimization problem subjected to a large number of nonlinear model equations. To reduce the problem dimension and remove coupling among the parameters, a hierarchical estimation strategy is proposed. The parameters are classified into packing-related and flow-related parameters, which are estimated using two-phase and three-phase distillation experimental data, respectively. In this way, the extension of mass transfer calculation for three-phase distillation is derived. Substantial improvements in the NEQ model prediction have been achieved. Compared with two-phase distillation, an increase of overall mass transfer ability is observed for the studied three-phase system. The extension of the mass transfer calculation can give a reasonable explanation for this observation, providing a better understanding of the intrinsic transfer phenomena inside three-phase packed columns. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900404p [article] Extension of the mass transfer calculation for three-phase distillation in a packed column : nonequilibrium model based parameter estimation [texte imprimé] / Chen, Liang, Auteur ; Jens-Uwe Repke, Auteur ; Günter Wozny, Auteur . - 2009 . - pp. 7289–7300. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 15 (Août 2009) . - pp. 7289–7300 Mots-clés : Nonequilibrium  modeling  Three-phase  distillation  Packed  column Résumé : Nonequilibrium (NEQ) modeling of three-phase (vapor−liquid−liquid) distillation in a packed column is still lacking of reliable correlations to calculate the interphase rate-based mass transfer. In this paper, extensions of the two most-used correlations [i.e., the Rocha correlation (Rocha, J. A.; Bravo, J. L.; Fair, J. R. Distillation Columns Containing Structured Packings: A Comprehensive Model for Their Performance. 2. Mass-Transfer Model. Ind. Eng. Chem. Res. 1996, 35, 1660) and the Billet and Schultes correlation (Billet, R.; Schultes, M. Prediction of Mass Transfer Columns with Dumped and Arranged Packings: Updated Summary of the Calculation Method of Billet & Schultes. Chem. Eng. Res. Des. 1999, 77, 498)] are proposed for mass transfer calculation of three-phase distillation in a packed column. Parameters used in the correlations are estimated on the basis of comprehensive experimental investigations on both two-phase (vapor−liquid) and three-phase distillation. The experimental database contains 150 different experiments of the 1-butanol/water/1-propanol system for different packings (Montz-Pak B1-350, Raschig Super-Ring 0.3, Rombopak 9M). The parameter estimation with multiple data sets and multipacking turns out to be a large-scale optimization problem subjected to a large number of nonlinear model equations. To reduce the problem dimension and remove coupling among the parameters, a hierarchical estimation strategy is proposed. The parameters are classified into packing-related and flow-related parameters, which are estimated using two-phase and three-phase distillation experimental data, respectively. In this way, the extension of mass transfer calculation for three-phase distillation is derived. Substantial improvements in the NEQ model prediction have been achieved. Compared with two-phase distillation, an increase of overall mass transfer ability is observed for the studied three-phase system. The extension of the mass transfer calculation can give a reasonable explanation for this observation, providing a better understanding of the intrinsic transfer phenomena inside three-phase packed columns. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900404p