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Calculation of pressure − temperature diagrams and distance for phase transition in polyethylene solutions / G. M. N. Costa 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. 12242-12253 Titre : Calculation of pressure − temperature diagrams and distance for phase transition in polyethylene solutions Type de document : texte imprimé Auteurs : G. M. N. Costa, Auteur ; S. Kislansky, Auteur ; Y. Guerrieri, Auteur Année de publication : 2011 Article en page(s) : pp. 12242-12253 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Phase  transitions Résumé : Understanding the phase behavior of polymer solutions is of great theoretical and practical importance. Pressure versus temperature (P-T) isopleths allow one to determine the number of phases present at a given T, P, and overall mixture composition. In this work, the PC-SAFT (perturbed-chain statistical associating fluid theory) equation of state (EOS) was applied to simulate the curves that describe the boundaries between several distinct regions depicted in P—T isopleths. A new strategy was used, and the simulation results were found to show good agreement with experimental cloud-point isopleth data from the literature. In addition, a method was developed to calculate the distance between an operating point (pressure and temperature) and the corresponding point in the interface for fixed molecular weight and weight fraction of the polymer. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23463388 [article] Calculation of pressure − temperature diagrams and distance for phase transition in polyethylene solutions [texte imprimé] / G. M. N. Costa, Auteur ; S. Kislansky, Auteur ; Y. Guerrieri, Auteur . - 2011 . - pp. 12242-12253. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 23 (Décembre 2010) . - pp. 12242-12253 Mots-clés : Phase  transitions Résumé : Understanding the phase behavior of polymer solutions is of great theoretical and practical importance. Pressure versus temperature (P-T) isopleths allow one to determine the number of phases present at a given T, P, and overall mixture composition. In this work, the PC-SAFT (perturbed-chain statistical associating fluid theory) equation of state (EOS) was applied to simulate the curves that describe the boundaries between several distinct regions depicted in P—T isopleths. A new strategy was used, and the simulation results were found to show good agreement with experimental cloud-point isopleth data from the literature. In addition, a method was developed to calculate the distance between an operating point (pressure and temperature) and the corresponding point in the interface for fixed molecular weight and weight fraction of the polymer. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23463388

Simulation of flash separation in polyethylene industrial processing / G. M. N. Costa in Industrial & engineering chemistry research, Vol. 48 N° 18 (Septembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 18 (Septembre 2009) . - pp. 8613–8628 Titre : Simulation of flash separation in polyethylene industrial processing : comparison of SRK and SL equations of state Type de document : texte imprimé Auteurs : G. M. N. Costa, Auteur ; Y. Guerrieri, Auteur ; S. Kislansky, Auteur Année de publication : 2010 Article en page(s) : pp. 8613–8628 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Soave-Redlich-Kwong  Sanchez  and  Lacombe  equations  Polyethylene  industrial  separators Résumé : The Soave−Redlich−Kwong (SRK) and the Sanchez and Lacombe (SL) equations of state are applied to the flash simulation of polyethylene industrial separators, specifically low-density polyethylene (eight resins) and linear low-density polyethylene (25 resins). Three mixing rules are used in the SRK equation: van der Waals (VDW) one-fluid, Wong−Sandler, and LCVM (linear combination of the Vidal and Michelsen mixing rules). The latter two mixing rules incorporate the Bogdanic and Vidal activity coefficient model. All these models involve two adjustable parameters. The results indicate that SL is the best model to simulate the flash separation of polyethylene under industrial conditions. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801652q [article] Simulation of flash separation in polyethylene industrial processing : comparison of SRK and SL equations of state [texte imprimé] / G. M. N. Costa, Auteur ; Y. Guerrieri, Auteur ; S. Kislansky, Auteur . - 2010 . - pp. 8613–8628. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 18 (Septembre 2009) . - pp. 8613–8628 Mots-clés : Soave-Redlich-Kwong  Sanchez  and  Lacombe  equations  Polyethylene  industrial  separators Résumé : The Soave−Redlich−Kwong (SRK) and the Sanchez and Lacombe (SL) equations of state are applied to the flash simulation of polyethylene industrial separators, specifically low-density polyethylene (eight resins) and linear low-density polyethylene (25 resins). Three mixing rules are used in the SRK equation: van der Waals (VDW) one-fluid, Wong−Sandler, and LCVM (linear combination of the Vidal and Michelsen mixing rules). The latter two mixing rules incorporate the Bogdanic and Vidal activity coefficient model. All these models involve two adjustable parameters. The results indicate that SL is the best model to simulate the flash separation of polyethylene under industrial conditions. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801652q