Documents disponibles écrits par cet auteur

A novel theory for predicting critical constants and the a function for pure polymers / Chorng H. Twu in Industrial & engineering chemistry research, Vol. 49 N° 22 (Novembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 22 (Novembre 2010) . - pp. 11801–11808 Titre : A novel theory for predicting critical constants and the a function for pure polymers Type de document : texte imprimé Auteurs : Chorng H. Twu, Auteur Année de publication : 2011 Article en page(s) : pp. 11801–11808 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Polymers Résumé : The cubic equation of state (CEoS) requires critical temperature (Tc), critical pressure (Pc), and the alpha (α) function for all components including polymers before it can be used for the prediction of phase behavior and thermodynamic properties for the system. For nonpolymers or conventional components, Tc, Pc, and α usually are available in databanks. However, this is not the case for polymers since their critical point is not measurable and they lack vapor pressures for the derivation of the α function. As a result, the task of finding CEoS critical constants as well as the α function for polymers becomes extremely challenging in the case of polymeric systems. A rigorous theory requiring only the liquid density data of the pure polymer is successfully developed in this work for the accurate prediction of the critical temperature, the critical pressure, and the α function for the pure polymer for use in all types of cubic equations of state. The proposed theory extends the application of cubic equations of state to polymer systems in a very simple fashion. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101474d [article] A novel theory for predicting critical constants and the a function for pure polymers [texte imprimé] / Chorng H. Twu, Auteur . - 2011 . - pp. 11801–11808. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 22 (Novembre 2010) . - pp. 11801–11808 Mots-clés : Polymers Résumé : The cubic equation of state (CEoS) requires critical temperature (Tc), critical pressure (Pc), and the alpha (α) function for all components including polymers before it can be used for the prediction of phase behavior and thermodynamic properties for the system. For nonpolymers or conventional components, Tc, Pc, and α usually are available in databanks. However, this is not the case for polymers since their critical point is not measurable and they lack vapor pressures for the derivation of the α function. As a result, the task of finding CEoS critical constants as well as the α function for polymers becomes extremely challenging in the case of polymeric systems. A rigorous theory requiring only the liquid density data of the pure polymer is successfully developed in this work for the accurate prediction of the critical temperature, the critical pressure, and the α function for the pure polymer for use in all types of cubic equations of state. The proposed theory extends the application of cubic equations of state to polymer systems in a very simple fashion. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101474d

Rigorously universal methodology of volume translation for cubic equations of state / Chorng H. Twu in Industrial & engineering chemistry research, Vol. 48 N° 12 (Juin 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5901–5906 Titre : Rigorously universal methodology of volume translation for cubic equations of state Type de document : texte imprimé Auteurs : Chorng H. Twu, Auteur ; Hui-Shan Chan, Auteur Année de publication : 2009 Article en page(s) : pp. 5901–5906 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Cubic  equations  State  Complex  nonpolar  systems Résumé : To model systems typically found in hydrocarbon production problems and the chemical industry, there are three basic types of calculations are required: phase equilibria, volumetric behavior, and thermophysical properties. Since 1972, cubic equations of state (CEoS) have shown surprising capabilities in the prediction of the phase equilibria of complex nonpolar systems. However, the prediction of the liquid volumes from cubic equations of state, despite the recently important advances in CEoS/AE mixing rules, still remains the weak point of this type of equations. A rigorous, universal, but simple methodology without introducing any regressed parameters is proposed for the volume translation for all types of cubic equation of state. The proposed methodology applies to not only defined components but also petroleum fractions. The translated cubic equations of state reproduce almost exactly the liquid density over the entire temperature range from the triple point to the critical point. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900222j [article] Rigorously universal methodology of volume translation for cubic equations of state [texte imprimé] / Chorng H. Twu, Auteur ; Hui-Shan Chan, Auteur . - 2009 . - pp. 5901–5906. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5901–5906 Mots-clés : Cubic  equations  State  Complex  nonpolar  systems Résumé : To model systems typically found in hydrocarbon production problems and the chemical industry, there are three basic types of calculations are required: phase equilibria, volumetric behavior, and thermophysical properties. Since 1972, cubic equations of state (CEoS) have shown surprising capabilities in the prediction of the phase equilibria of complex nonpolar systems. However, the prediction of the liquid volumes from cubic equations of state, despite the recently important advances in CEoS/AE mixing rules, still remains the weak point of this type of equations. A rigorous, universal, but simple methodology without introducing any regressed parameters is proposed for the volume translation for all types of cubic equation of state. The proposed methodology applies to not only defined components but also petroleum fractions. The translated cubic equations of state reproduce almost exactly the liquid density over the entire temperature range from the triple point to the critical point. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900222j