Documents disponibles écrits par cet auteur

Simulation and analysis of an ethylene slurry polymerization system using supercritical propane / Zhao Xiaojun in Industrial & engineering chemistry research, Vol. 51 N° 2 (Janvier 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 2 (Janvier 2012) . - pp. 682-690 Titre : Simulation and analysis of an ethylene slurry polymerization system using supercritical propane Type de document : texte imprimé Auteurs : Zhao Xiaojun, Auteur ; Guo Xiaojun, Auteur ; Cheng Peng, Auteur Année de publication : 2012 Article en page(s) : pp. 682-690 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Supercritical  state  Polymerization Résumé : In this paper, a model for an ethylene slurry polymerization system using supercritical propane as a solvent is developed by adopting a set of thermodynamic and kinetic parameters using fundamental chemical engineering principles and Polymers Plus software. The Ziegler-Natta catalyst is characterized by assuming the existence of multiple types of catalyst sites and deconvolution data from gel permeation chromatography to determine the most probable chain-length distribution and relative amounts of polymer produced at each site type. A set of suitable reaction subclasses and kinetic constants for different site types that fit plant conditions is developed, validating our model. The values calculated for production rate, ethylene conversion, residence time, H2/C2H4 molar ratio in the reactor, number-average molecular weight, and polydispersity index are all close to actual values, verifying that our model accurately describes plant conditions. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25476400 [article] Simulation and analysis of an ethylene slurry polymerization system using supercritical propane [texte imprimé] / Zhao Xiaojun, Auteur ; Guo Xiaojun, Auteur ; Cheng Peng, Auteur . - 2012 . - pp. 682-690. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 2 (Janvier 2012) . - pp. 682-690 Mots-clés : Supercritical  state  Polymerization Résumé : In this paper, a model for an ethylene slurry polymerization system using supercritical propane as a solvent is developed by adopting a set of thermodynamic and kinetic parameters using fundamental chemical engineering principles and Polymers Plus software. The Ziegler-Natta catalyst is characterized by assuming the existence of multiple types of catalyst sites and deconvolution data from gel permeation chromatography to determine the most probable chain-length distribution and relative amounts of polymer produced at each site type. A set of suitable reaction subclasses and kinetic constants for different site types that fit plant conditions is developed, validating our model. The values calculated for production rate, ethylene conversion, residence time, H2/C2H4 molar ratio in the reactor, number-average molecular weight, and polydispersity index are all close to actual values, verifying that our model accurately describes plant conditions. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25476400