Documents disponibles écrits par cet auteur

Calculation of solubilities for systems containing multiple non-volatile solutes and supercritical carbon dioxide / Beatriz P. Nobre in Industrial & engineering chemistry research, Vol. 48 N°3 (Février 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1551–1555 Titre : Calculation of solubilities for systems containing multiple non-volatile solutes and supercritical carbon dioxide Type de document : texte imprimé Auteurs : Beatriz P. Nobre, Auteur ; Rui L. Mendes, Auteur ; Eduardo M. Queiroz, Auteur Année de publication : 2009 Article en page(s) : p. 1551–1555 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Supercritical  fluids  Systems  non-volatile  --  calculation  solubility  Carbon  Dioxide  --  calculation  solubility Résumé : Most of the investigations on thermodynamic modeling of solid solubility in supercritical fluids are limited to pure nonvolatile solutes. Even with a presence of solid mixtures, it is considered that the different solids in the mixture behave as if they were alone, that is, they do not interact. Results in the literature show that this is true if the molecules of the solutes have symmetry, both in size or polarity. The aim of this work is to present solubility experimental data of a solid mixture (β-carotene/bixin) and supercritical carbon dioxide and to propose a thermodynamic model in order to describe this very asymmetric system. The proposed model is based on the Peng−Robinson equation of state and depends on the critical properties and the binary interaction parameters. The binary interaction parameters between carbon dioxide and β-carotene and between carbon dioxide and bixin were obtained from binary experimental data. For the solid mixture and carbon dioxide the model considers interactions between the solids in the solid phase and relaxes the constraint of equal interaction parameters between the solutes. A new set of experimental data on the solubility in supercritical CO2 of a mixture of bixin and β-carotene (1:1, wt) measured at 40 and 60 °C and pressures up to 350 bar is presented, and its behavior is well described by the proposed model, with a deviation of 18.2% and 44.6% for β-carotene and bixin, respectively, opposed to the model without any solid interaction, which poorly describes the available experimental data (approximately 70% average deviation). This model may be used for solid mixtures even when the solids melt. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8006352 [article] Calculation of solubilities for systems containing multiple non-volatile solutes and supercritical carbon dioxide [texte imprimé] / Beatriz P. Nobre, Auteur ; Rui L. Mendes, Auteur ; Eduardo M. Queiroz, Auteur . - 2009 . - p. 1551–1555. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1551–1555 Mots-clés : Supercritical  fluids  Systems  non-volatile  --  calculation  solubility  Carbon  Dioxide  --  calculation  solubility Résumé : Most of the investigations on thermodynamic modeling of solid solubility in supercritical fluids are limited to pure nonvolatile solutes. Even with a presence of solid mixtures, it is considered that the different solids in the mixture behave as if they were alone, that is, they do not interact. Results in the literature show that this is true if the molecules of the solutes have symmetry, both in size or polarity. The aim of this work is to present solubility experimental data of a solid mixture (β-carotene/bixin) and supercritical carbon dioxide and to propose a thermodynamic model in order to describe this very asymmetric system. The proposed model is based on the Peng−Robinson equation of state and depends on the critical properties and the binary interaction parameters. The binary interaction parameters between carbon dioxide and β-carotene and between carbon dioxide and bixin were obtained from binary experimental data. For the solid mixture and carbon dioxide the model considers interactions between the solids in the solid phase and relaxes the constraint of equal interaction parameters between the solutes. A new set of experimental data on the solubility in supercritical CO2 of a mixture of bixin and β-carotene (1:1, wt) measured at 40 and 60 °C and pressures up to 350 bar is presented, and its behavior is well described by the proposed model, with a deviation of 18.2% and 44.6% for β-carotene and bixin, respectively, opposed to the model without any solid interaction, which poorly describes the available experimental data (approximately 70% average deviation). This model may be used for solid mixtures even when the solids melt. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8006352

Hydrogen source diagram / Joana L Borges in Industrial & engineering chemistry research, Vol. 51 N° 39 (Octobre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 39 (Octobre 2012) . - pp. 12877-12885 Titre : Hydrogen source diagram : A procedure for minimization of hydrogen demand in petroleum refineries Type de document : texte imprimé Auteurs : Joana L Borges, Auteur ; Fernando L. P. Pessoa, Auteur ; Eduardo M. Queiroz, Auteur Année de publication : 2012 Article en page(s) : pp. 12877-12885 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Refinery  Petroleum Résumé : The consumption of hydrogen in petroleum refineries is increasing due to its growing intensive use in treatment processes and in new refining technologies. This trend and the reduction of hydrogen production in gasoline processing have generated a new panorama. In this new context, target identification for minimum consumption of hydrogen in a distribution network has become fundamental information in the definition of minimum hydrogen requirements in petroleum refineries. This paper presents the hydrogen source diagram (HSD), a new algorithmic method for minimum hydrogen consumption target calculation and, simultaneously, hydrogen network flowsheet synthesis. The proposed HSD procedure is described in details using a case study, showing its wide scope. The results demonstrate the effectiveness of the procedure and show that the generated network can be easily adapted to meet specific plant restrictions. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26419244 [article] Hydrogen source diagram : A procedure for minimization of hydrogen demand in petroleum refineries [texte imprimé] / Joana L Borges, Auteur ; Fernando L. P. Pessoa, Auteur ; Eduardo M. Queiroz, Auteur . - 2012 . - pp. 12877-12885. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 39 (Octobre 2012) . - pp. 12877-12885 Mots-clés : Refinery  Petroleum Résumé : The consumption of hydrogen in petroleum refineries is increasing due to its growing intensive use in treatment processes and in new refining technologies. This trend and the reduction of hydrogen production in gasoline processing have generated a new panorama. In this new context, target identification for minimum consumption of hydrogen in a distribution network has become fundamental information in the definition of minimum hydrogen requirements in petroleum refineries. This paper presents the hydrogen source diagram (HSD), a new algorithmic method for minimum hydrogen consumption target calculation and, simultaneously, hydrogen network flowsheet synthesis. The proposed HSD procedure is described in details using a case study, showing its wide scope. The results demonstrate the effectiveness of the procedure and show that the generated network can be easily adapted to meet specific plant restrictions. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26419244

Thermohydraulic simulation of heat exchanger networks / Viviane B. G. Tavares in Industrial & engineering chemistry research, Vol. 49 N° 10 (Mai 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 10 (Mai 2010) . - pp. 4756–4765 Titre : Thermohydraulic simulation of heat exchanger networks Type de document : texte imprimé Auteurs : Viviane B. G. Tavares, Auteur ; Eduardo M. Queiroz, Auteur ; André L. H. Costa, Auteur Année de publication : 2010 Article en page(s) : pp. 4756–4765 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Heat  exchanger  networks Résumé : This paper presents a simulation scheme of heat exchanger networks considering thermal and hydraulic effects simultaneously. The determination of network temperatures is carried out together with the evaluation of flow rates and pressures along the network, considering head losses in heat exchangers and associated piping. The model encompasses two systems of equations: a network hydraulic model, composed by a nonlinear system of mass balances and fluid flow equations, and an energy model, represented by a linear system of energy balances and heat exchanger equations. The mathematical structure is based on a matrix representation of the network. The proposed model allows a more realistic analysis of heat exchanger networks where flow rates are constrained by limitations of hydraulic facilities. The utilization of the simulation scheme is illustrated by the analysis of a cooling water system. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901275z [article] Thermohydraulic simulation of heat exchanger networks [texte imprimé] / Viviane B. G. Tavares, Auteur ; Eduardo M. Queiroz, Auteur ; André L. H. Costa, Auteur . - 2010 . - pp. 4756–4765. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 10 (Mai 2010) . - pp. 4756–4765 Mots-clés : Heat  exchanger  networks Résumé : This paper presents a simulation scheme of heat exchanger networks considering thermal and hydraulic effects simultaneously. The determination of network temperatures is carried out together with the evaluation of flow rates and pressures along the network, considering head losses in heat exchangers and associated piping. The model encompasses two systems of equations: a network hydraulic model, composed by a nonlinear system of mass balances and fluid flow equations, and an energy model, represented by a linear system of energy balances and heat exchanger equations. The mathematical structure is based on a matrix representation of the network. The proposed model allows a more realistic analysis of heat exchanger networks where flow rates are constrained by limitations of hydraulic facilities. The utilization of the simulation scheme is illustrated by the analysis of a cooling water system. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901275z