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Expanded fluid-based viscosity correlation for hydrocarbons / Harvey W. Yarranton in Industrial & engineering chemistry research, Vol. 48 N° 7 (Avril 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 7 (Avril 2009) . - pp. 3640–3648 Titre : Expanded fluid-based viscosity correlation for hydrocarbons Type de document : texte imprimé Auteurs : Harvey W. Yarranton, Auteur ; M. A. Satyro, Auteur Année de publication : 2009 Article en page(s) : pp. 3640–3648 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Hydrocarbons  Viscosity  Correlation Résumé : The viscosity of pure hydrocarbons was correlated using a simple function based on the fluid density. The correlation has three adjustable parameters, a compressed state density, ρs°, an empirical parameter, c2, that scales the viscosity response to fluid expansion, and another empirical parameter, c3, used to tune at pressures above 10 MPa. The inputs to the correlation are the fluid density, pressure, and low-pressure gas viscosity. The correlation fit experimental viscosities for 39 pure hydrocarbons including n-alkanes, branched alkanes, alkenes, cyclics, and aromatics, within experimental error over a broad range of temperatures and pressures. Heavy hydrocarbons such as mineral oils were also fit with an AAPRD of 2.7%. Binary mixture viscosities were predicted to within 10% using simple volumetric mixing rules. The method provides a single framework for liquid and vapor phases, is simple to implement, and is very fast computationally, making it ideal for incorporation into process and reservoir simulators. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801698h [article] Expanded fluid-based viscosity correlation for hydrocarbons [texte imprimé] / Harvey W. Yarranton, Auteur ; M. A. Satyro, Auteur . - 2009 . - pp. 3640–3648. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 7 (Avril 2009) . - pp. 3640–3648 Mots-clés : Hydrocarbons  Viscosity  Correlation Résumé : The viscosity of pure hydrocarbons was correlated using a simple function based on the fluid density. The correlation has three adjustable parameters, a compressed state density, ρs°, an empirical parameter, c2, that scales the viscosity response to fluid expansion, and another empirical parameter, c3, used to tune at pressures above 10 MPa. The inputs to the correlation are the fluid density, pressure, and low-pressure gas viscosity. The correlation fit experimental viscosities for 39 pure hydrocarbons including n-alkanes, branched alkanes, alkenes, cyclics, and aromatics, within experimental error over a broad range of temperatures and pressures. Heavy hydrocarbons such as mineral oils were also fit with an AAPRD of 2.7%. Binary mixture viscosities were predicted to within 10% using simple volumetric mixing rules. The method provides a single framework for liquid and vapor phases, is simple to implement, and is very fast computationally, making it ideal for incorporation into process and reservoir simulators. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801698h

Predicting the viscosity of asymmetric hydrocarbon mixtures with the expanded fluid viscosity correlation / H. Motahhari in Industrial & engineering chemistry research, Vol. 50 N° 22 (Novembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 22 (Novembre 2011) . - pp. 12831-12843 Titre : Predicting the viscosity of asymmetric hydrocarbon mixtures with the expanded fluid viscosity correlation Type de document : texte imprimé Auteurs : H. Motahhari, Auteur ; M. A. Satyro, Auteur ; Harvey W. Yarranton, Auteur Année de publication : 2012 Article en page(s) : pp. 12831-12843 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Correlation  analysis  Correlation  Viscosity  Prediction Résumé : Mass-based mixing rules are proposed for the Expanded Fluid viscosity correlation that are suitable for asymmetric mixtures and replace the original volumetric mixing rules. The Expanded Fluid correlation provides viscosity values as a function of fluid density and characterizes each pure compound with three fluid-specific parameters: c2, ρs° and c3, when using experimental densities and two parameters, c2, ρs°, when using a cubic equation of state. The proposed set of mixing rules predicts the viscosity of over 90 binary mixtures with overall average absolute relative deviations (AARD) of 2.9% and 7.8% using measured densities and densities estimated from an equation of state, respectively. To improve the predictions in equation of state applications, a binary interaction parameter is introduced to the mixing rules, compensating for inaccuracies associated with density predictions from simple cubic equations of state. Using fitted interaction parameters, the overall AARD is 3.6%. The binary interaction parameters are generalized as a function of the molecular weight and Watson K-factor. Using these generalized binary interaction parameters, the overall AARD is reduced to 5.4% for over 90 binary mixtures. The proposed mixing rules and the general binary interaction parameters correlations are also tested on an independent data set which includes 40 binary, ternary, and multicomponent mixtures. The overall AARDs are 8.4% using measured densities and 11.6 and 7.1% using equation-of-state based densities with zero and generalized binary interaction parameters, respectively. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24745759 [article] Predicting the viscosity of asymmetric hydrocarbon mixtures with the expanded fluid viscosity correlation [texte imprimé] / H. Motahhari, Auteur ; M. A. Satyro, Auteur ; Harvey W. Yarranton, Auteur . - 2012 . - pp. 12831-12843. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 22 (Novembre 2011) . - pp. 12831-12843 Mots-clés : Correlation  analysis  Correlation  Viscosity  Prediction Résumé : Mass-based mixing rules are proposed for the Expanded Fluid viscosity correlation that are suitable for asymmetric mixtures and replace the original volumetric mixing rules. The Expanded Fluid correlation provides viscosity values as a function of fluid density and characterizes each pure compound with three fluid-specific parameters: c2, ρs° and c3, when using experimental densities and two parameters, c2, ρs°, when using a cubic equation of state. The proposed set of mixing rules predicts the viscosity of over 90 binary mixtures with overall average absolute relative deviations (AARD) of 2.9% and 7.8% using measured densities and densities estimated from an equation of state, respectively. To improve the predictions in equation of state applications, a binary interaction parameter is introduced to the mixing rules, compensating for inaccuracies associated with density predictions from simple cubic equations of state. Using fitted interaction parameters, the overall AARD is 3.6%. The binary interaction parameters are generalized as a function of the molecular weight and Watson K-factor. Using these generalized binary interaction parameters, the overall AARD is reduced to 5.4% for over 90 binary mixtures. The proposed mixing rules and the general binary interaction parameters correlations are also tested on an independent data set which includes 40 binary, ternary, and multicomponent mixtures. The overall AARDs are 8.4% using measured densities and 11.6 and 7.1% using equation-of-state based densities with zero and generalized binary interaction parameters, respectively. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24745759

Rag layers in oil sand froths / Mehrrad Saadatmand ; Harvey W. Yarranton ; Kevin Moran in Industrial & engineering chemistry research, Vol. 47 n°22 (Novembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°22 (Novembre 2008) . - p. 8828–8839 Titre : Rag layers in oil sand froths Type de document : texte imprimé Auteurs : Mehrrad Saadatmand, Auteur ; Harvey W. Yarranton, Auteur ; Kevin Moran, Auteur Année de publication : 2008 Article en page(s) : p. 8828–8839 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : oil  sand Résumé : During the settling stages in some oil sands froth treatments, a rag layer (an undesirable mixture of dispersed oil, water, and solids) can form at the water−oil interface. To investigate rag layer formation, oil sand froths were diluted with mixtures of toluene and heptane and the diluted froths were centrifuged in steps of increasing rpm. The volumes of oil phase, rag layer, free water, and sediment were measured after each step. The data obtained from the experiments were used for material balances to determine the composition of the rag layers. The size and properties of the rag layer solids were also measured. Two mechanisms were found to influence rag layer formation: slow coalescence of emulsified water between 1500 and 3000 rpm (200−1000 times gravity); trapping of fine intermediate to oil wet solids at higher rpm and residence times. The main process factors affecting rag formation appear to be the type of diluent and asphaltene precipitation. As well, higher quality oil sand produced much smaller rag layers. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800601r [article] Rag layers in oil sand froths [texte imprimé] / Mehrrad Saadatmand, Auteur ; Harvey W. Yarranton, Auteur ; Kevin Moran, Auteur . - 2008 . - p. 8828–8839. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°22 (Novembre 2008) . - p. 8828–8839 Mots-clés : oil  sand Résumé : During the settling stages in some oil sands froth treatments, a rag layer (an undesirable mixture of dispersed oil, water, and solids) can form at the water−oil interface. To investigate rag layer formation, oil sand froths were diluted with mixtures of toluene and heptane and the diluted froths were centrifuged in steps of increasing rpm. The volumes of oil phase, rag layer, free water, and sediment were measured after each step. The data obtained from the experiments were used for material balances to determine the composition of the rag layers. The size and properties of the rag layer solids were also measured. Two mechanisms were found to influence rag layer formation: slow coalescence of emulsified water between 1500 and 3000 rpm (200−1000 times gravity); trapping of fine intermediate to oil wet solids at higher rpm and residence times. The main process factors affecting rag formation appear to be the type of diluent and asphaltene precipitation. As well, higher quality oil sand produced much smaller rag layers. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800601r