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Crossover volume translation soave – redlich – kwong equation of state for fluids / Xin-Hao Xu in Industrial & engineering chemistry research, Vol. 51 N° 18 (Mai 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 18 (Mai 2012) . - pp. 6580-6585 Titre : Crossover volume translation soave – redlich – kwong equation of state for fluids Type de document : texte imprimé Auteurs : Xin-Hao Xu, Auteur ; Yuan-Yuan Duan, Auteur ; Zhen Yang, Auteur Année de publication : 2012 Article en page(s) : pp. 6580-6585 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Thermodynamic  properties  Equations  of  state Résumé : The crossover method can be used in the classical equations of state (EOSs) to study the singular behavior of fluids in the critical region. However, this usually involves introducing additional system-dependent parameters and changing the values of classical parameters in the EOS with curve fits that require large amounts of experimental data. This work presents a crossover volume translation Soave-Redlich-Kwong (SRK) equation of state with unchanged classical parameters and crossover parameters either set as constants or determined solely by the critical compressibility factor. This EOS is used to describe the VLE and ppT data of 16 fluids (n-alkanes from methane to hexane, Ar, N2, O2 CO2, CO, H2S, SO2, R22, R125, and R245fa) to show that the crossover volume translation SRK EOS can accurately predict experimental data both far from and near the critical point. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25867308 [article] Crossover volume translation soave – redlich – kwong equation of state for fluids [texte imprimé] / Xin-Hao Xu, Auteur ; Yuan-Yuan Duan, Auteur ; Zhen Yang, Auteur . - 2012 . - pp. 6580-6585. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 18 (Mai 2012) . - pp. 6580-6585 Mots-clés : Thermodynamic  properties  Equations  of  state Résumé : The crossover method can be used in the classical equations of state (EOSs) to study the singular behavior of fluids in the critical region. However, this usually involves introducing additional system-dependent parameters and changing the values of classical parameters in the EOS with curve fits that require large amounts of experimental data. This work presents a crossover volume translation Soave-Redlich-Kwong (SRK) equation of state with unchanged classical parameters and crossover parameters either set as constants or determined solely by the critical compressibility factor. This EOS is used to describe the VLE and ppT data of 16 fluids (n-alkanes from methane to hexane, Ar, N2, O2 CO2, CO, H2S, SO2, R22, R125, and R245fa) to show that the crossover volume translation SRK EOS can accurately predict experimental data both far from and near the critical point. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25867308

Vapor-liquid equilibria predictions for alternative working fluids at low and moderate pressures / Shu-Xin Hou in Industrial & engineering chemistry research, Vol. 47 N°19 (Octobre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°19 (Octobre 2008) . - p. 7501–7508 Titre : Vapor-liquid equilibria predictions for alternative working fluids at low and moderate pressures Type de document : texte imprimé Auteurs : Shu-Xin Hou, Auteur ; Yuan-Yuan Duan, Auteur ; Xiao-Dong Wang, Auteur Année de publication : 2008 Article en page(s) : p. 7501–7508 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Working  fluids  Vapor-liquid  equilibria  Soave-Redlich-Kwong  EoS Résumé : Alternative working fluid mixtures containing hydrofluoroethers, hydrofluorocarbons, alkanes, alcohols, ketones, and esters widely used as process fluids generally exhibit azeotropes, high nonideality, and association effects. In this work, the vapor−liquid equilibria for these mixtures are predicted using a combination of the Soave−Redlich−Kwong equation of state, zero reference pressure GE−EoS mixing rules, and the UNIFAC group contribution model. A new functional group assignment strategy was developed, and the model interaction parameters between groups were obtained from selected binary vapor−liquid equilibria data to give fairly good agreement between the calculated results and the experimental data. The method is also extended to ternary systems for VLE representations in a totally predictive manner with only the molecular structures, the critical parameters, and the acentric factors of the pure components needed. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800133b [article] Vapor-liquid equilibria predictions for alternative working fluids at low and moderate pressures [texte imprimé] / Shu-Xin Hou, Auteur ; Yuan-Yuan Duan, Auteur ; Xiao-Dong Wang, Auteur . - 2008 . - p. 7501–7508. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°19 (Octobre 2008) . - p. 7501–7508 Mots-clés : Working  fluids  Vapor-liquid  equilibria  Soave-Redlich-Kwong  EoS Résumé : Alternative working fluid mixtures containing hydrofluoroethers, hydrofluorocarbons, alkanes, alcohols, ketones, and esters widely used as process fluids generally exhibit azeotropes, high nonideality, and association effects. In this work, the vapor−liquid equilibria for these mixtures are predicted using a combination of the Soave−Redlich−Kwong equation of state, zero reference pressure GE−EoS mixing rules, and the UNIFAC group contribution model. A new functional group assignment strategy was developed, and the model interaction parameters between groups were obtained from selected binary vapor−liquid equilibria data to give fairly good agreement between the calculated results and the experimental data. The method is also extended to ternary systems for VLE representations in a totally predictive manner with only the molecular structures, the critical parameters, and the acentric factors of the pure components needed. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800133b