Documents disponibles écrits par cet auteur

A disjunctive programming model for simultaneous synthesis and detailed design of cooling networks / José María Ponce-Ortega in Industrial & engineering chemistry research, Vol. 48 N° 6 (Mars 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 6 (Mars 2009) . - pp. 2991–3003 Titre : A disjunctive programming model for simultaneous synthesis and detailed design of cooling networks Type de document : texte imprimé Auteurs : José María Ponce-Ortega, Auteur ; Medardo Serna-González, Auteur ; Arturo Jimenez-Gutierrez, Auteur Année de publication : 2009 Article en page(s) : pp. 2991–3003 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Cooling  networks  Disjunctive  programming  formulation  Optimum  cooling  network  configuration  Mechanical  design  Thermal-hydraulic  variables Résumé : This paper presents a model that simultaneously considers synthesis and detailed design aspects of cooling networks. The model is based on a generalized disjunctive programming formulation that is transformed into a mixed-integer nonlinear program. The objective function is to minimize the total annual cost, which accounts for the cold utility consumption cost, the capital cost for the coolers and pumps, and the pumping costs. The model uses a stagewise superstructure that allows combinations of cooler arrangements in series or in parallel, as well as bypass, mixing, and splitting of the cold utility. The model also incorporates several constraints to meet some specified design codes. In addition to the optimum cooling network configuration, the solution provides the details on the mechanical design features and thermal−hydraulic variables of each cooler unit. Three example problems are presented to show the application of the proposed model. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8015494 [article] A disjunctive programming model for simultaneous synthesis and detailed design of cooling networks [texte imprimé] / José María Ponce-Ortega, Auteur ; Medardo Serna-González, Auteur ; Arturo Jimenez-Gutierrez, Auteur . - 2009 . - pp. 2991–3003. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 6 (Mars 2009) . - pp. 2991–3003 Mots-clés : Cooling  networks  Disjunctive  programming  formulation  Optimum  cooling  network  configuration  Mechanical  design  Thermal-hydraulic  variables Résumé : This paper presents a model that simultaneously considers synthesis and detailed design aspects of cooling networks. The model is based on a generalized disjunctive programming formulation that is transformed into a mixed-integer nonlinear program. The objective function is to minimize the total annual cost, which accounts for the cold utility consumption cost, the capital cost for the coolers and pumps, and the pumping costs. The model uses a stagewise superstructure that allows combinations of cooler arrangements in series or in parallel, as well as bypass, mixing, and splitting of the cold utility. The model also incorporates several constraints to meet some specified design codes. In addition to the optimum cooling network configuration, the solution provides the details on the mechanical design features and thermal−hydraulic variables of each cooler unit. Three example problems are presented to show the application of the proposed model. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8015494

Experimental analysis and modeling of the separation of triacylglycerol and free fatty acid mixtures using molecular distillation / Guillermo Arzate-Martinez in Industrial & engineering chemistry research, Vol. 50 N° 19 (Octobre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 19 (Octobre 2011) . - pp. 11237-11244 Titre : Experimental analysis and modeling of the separation of triacylglycerol and free fatty acid mixtures using molecular distillation Type de document : texte imprimé Auteurs : Guillermo Arzate-Martinez, Auteur ; Arturo Jimenez-Gutierrez, Auteur ; Hugo S. Garcia, Auteur Année de publication : 2011 Article en page(s) : pp. 11237-11244 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Distillation  Modeling Résumé : Experimental results for the separation of triacylglycerols and free fatty acids mixtures by molecular distillation are reported. The experiments were carried out so as to evaluate the effect of relevant operating conditions on the performance of the separation. Mixtures with different compositions were distilled at pressures of 1 and 4mbar, with temperatures ranging from 40 to 80 °C, mass flows from 0.95 to 7.65 g/min, and wiper speeds from 0 to 400 rpm. Distillate and retentate products were weighed and evaporated fractions were calculated. The results were compared with those predicted by the use of the Langmuir Knudsen equation together with a functional group contribution method to estimate the vapor pressure of the components. The approach provided a good basis to model the experimental results for the separation by molecular distillation of binary mixtures of free fatty acids and triacylglycerols, as well as for mixtures of several free fatty acids. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24573320 [article] Experimental analysis and modeling of the separation of triacylglycerol and free fatty acid mixtures using molecular distillation [texte imprimé] / Guillermo Arzate-Martinez, Auteur ; Arturo Jimenez-Gutierrez, Auteur ; Hugo S. Garcia, Auteur . - 2011 . - pp. 11237-11244. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 19 (Octobre 2011) . - pp. 11237-11244 Mots-clés : Distillation  Modeling Résumé : Experimental results for the separation of triacylglycerols and free fatty acids mixtures by molecular distillation are reported. The experiments were carried out so as to evaluate the effect of relevant operating conditions on the performance of the separation. Mixtures with different compositions were distilled at pressures of 1 and 4mbar, with temperatures ranging from 40 to 80 °C, mass flows from 0.95 to 7.65 g/min, and wiper speeds from 0 to 400 rpm. Distillate and retentate products were weighed and evaporated fractions were calculated. The results were compared with those predicted by the use of the Langmuir Knudsen equation together with a functional group contribution method to estimate the vapor pressure of the components. The approach provided a good basis to model the experimental results for the separation by molecular distillation of binary mixtures of free fatty acids and triacylglycerols, as well as for mixtures of several free fatty acids. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24573320

A note on the controllability of two short-cut designs for a class of thermally coupled distillation sequence / Miguel Vaca in Industrial & engineering chemistry research, Vol. 48 N°4 (Février 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - p. 2283–2289 Titre : A note on the controllability of two short-cut designs for a class of thermally coupled distillation sequence Type de document : texte imprimé Auteurs : Miguel Vaca, Auteur ; Arturo Jimenez-Gutierrez, Auteur ; José Alvarez-Ramírez, Auteur Année de publication : 2009 Article en page(s) : p. 2283–2289 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Ternary  mixtures  Thermally  coupled  sequence  Open-loop  transfer  function Résumé : The separation of multicomponent mixtures with conventional distillation sequences is energy-intensive. The use of thermal coupling sequences provides a more-efficient alternative, although their industrial usage has been quite limited, because of the complexity of design methods and potential difficulties during operation. In this work, we study a direct thermally coupled sequence for the separation of ideal ternary mixtures and perform a comparative study of two different designs, one based on the tray structure of an equivalent conventional sequence and the other specifically considering the effect of the thermal coupling on tray distribution and operational flows. Using the singular value decomposition technique on open-loop transfer function matrixes, controllability indexes were obtained. The controllability indexes of both designs are of the same order of magnitude, which means that their dynamic responses are basically the same. Although additional studies of dynamic simulation under closed-loop conditions are necessary, our results indicate that the controllability properties are similar, and that the design that provides the smallest energy consumption should be favored. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800993u [article] A note on the controllability of two short-cut designs for a class of thermally coupled distillation sequence [texte imprimé] / Miguel Vaca, Auteur ; Arturo Jimenez-Gutierrez, Auteur ; José Alvarez-Ramírez, Auteur . - 2009 . - p. 2283–2289. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - p. 2283–2289 Mots-clés : Ternary  mixtures  Thermally  coupled  sequence  Open-loop  transfer  function Résumé : The separation of multicomponent mixtures with conventional distillation sequences is energy-intensive. The use of thermal coupling sequences provides a more-efficient alternative, although their industrial usage has been quite limited, because of the complexity of design methods and potential difficulties during operation. In this work, we study a direct thermally coupled sequence for the separation of ideal ternary mixtures and perform a comparative study of two different designs, one based on the tray structure of an equivalent conventional sequence and the other specifically considering the effect of the thermal coupling on tray distribution and operational flows. Using the singular value decomposition technique on open-loop transfer function matrixes, controllability indexes were obtained. The controllability indexes of both designs are of the same order of magnitude, which means that their dynamic responses are basically the same. Although additional studies of dynamic simulation under closed-loop conditions are necessary, our results indicate that the controllability properties are similar, and that the design that provides the smallest energy consumption should be favored. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800993u

Simultaneous retrofit and heat integration of chemical processes / José M. Ponce-Ortega in Industrial & engineering chemistry research, Vol. 47 n°15 (Août 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°15 (Août 2008) . - p. 5512–5528 Titre : Simultaneous retrofit and heat integration of chemical processes Type de document : texte imprimé Auteurs : José M. Ponce-Ortega, Auteur ; Arturo Jimenez-Gutierrez, Auteur ; Ignacio E. Grossmann, Auteur Année de publication : 2008 Article en page(s) : p. 5512–5528 Note générale : Bibliogr. p. 5528 Langues : Anglais (eng) Mots-clés : Heat  exchanger  networks  --  retrofit;  Mixed-integer  nonlinear  programming  model Résumé : In this paper, a new formulation for the retrofit of heat exchanger networks considering process modifications is presented. The method accounts for the interactions between the process conditions and the heat integration options to provide an optimal structure for a redesigned heat exchanger network. The formulation is based on a superstructure that considers explicitly the plant layout and the piping arrangement, which yields a mixed-integer nonlinear programming model. The model presented here includes the treatment of isothermal process streams that exchange their latent heats, in addition to the streams commonly considered with sensible heat loads. The objective function consists of maximizing the total annual profit for the retrofit process, which includes the income from products sales and the expenses due to raw materials, capital cost for new units, utility costs, and the piping modification costs. The results for the cases of study show that significant improvement in the process profitability can be obtained with the simultaneous approach presented in this work for process retrofit with respect to the sole consideration of the heat exchanger networks. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071182%2B [article] Simultaneous retrofit and heat integration of chemical processes [texte imprimé] / José M. Ponce-Ortega, Auteur ; Arturo Jimenez-Gutierrez, Auteur ; Ignacio E. Grossmann, Auteur . - 2008 . - p. 5512–5528. Bibliogr. p. 5528 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°15 (Août 2008) . - p. 5512–5528 Mots-clés : Heat  exchanger  networks  --  retrofit;  Mixed-integer  nonlinear  programming  model Résumé : In this paper, a new formulation for the retrofit of heat exchanger networks considering process modifications is presented. The method accounts for the interactions between the process conditions and the heat integration options to provide an optimal structure for a redesigned heat exchanger network. The formulation is based on a superstructure that considers explicitly the plant layout and the piping arrangement, which yields a mixed-integer nonlinear programming model. The model presented here includes the treatment of isothermal process streams that exchange their latent heats, in addition to the streams commonly considered with sensible heat loads. The objective function consists of maximizing the total annual profit for the retrofit process, which includes the income from products sales and the expenses due to raw materials, capital cost for new units, utility costs, and the piping modification costs. The results for the cases of study show that significant improvement in the process profitability can be obtained with the simultaneous approach presented in this work for process retrofit with respect to the sole consideration of the heat exchanger networks. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071182%2B

Synthesis of heat exchanger networks with optimal placement of multiple utilities / José María Ponce-Ortega in Industrial & engineering chemistry research, Vol. 49 N° 6 (Mars 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 6 (Mars 2010) . - pp. 2849–2856 Titre : Synthesis of heat exchanger networks with optimal placement of multiple utilities Type de document : texte imprimé Auteurs : José María Ponce-Ortega, Auteur ; Medardo Serna-González, Auteur ; Arturo Jimenez-Gutierrez, Auteur Année de publication : 2010 Article en page(s) : pp. 2849–2856 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Heat  exchanger;  Networks;  Synthesis;  Utilities Résumé : The synthesis problem of optimal heat exchanger networks using multiple utilities is addressed. A mixed integer nonlinear programming (MINLP) model is developed based on a stagewise superstructure that contains all possible matches between hot and cold streams in every stage. Unlike previous MINLP formulations, exchanges of process streams with utilities are allowed in each stage of the superstructure to determine the optimal location of hot and cold utilities. The optimal choice of different types of available utilities is considered through a disjunctive programming formulation. The model can handle forbidden matches and required and restricted matches as well as isothermal and nonisothermal process streams. The MINLP problem is readily solved using commercial local solvers. Four examples are presented to show the application of the proposed methodology. No computation complications were observed in the examples presented, and they required small CPU times. Note de contenu : Bibogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901750a [article] Synthesis of heat exchanger networks with optimal placement of multiple utilities [texte imprimé] / José María Ponce-Ortega, Auteur ; Medardo Serna-González, Auteur ; Arturo Jimenez-Gutierrez, Auteur . - 2010 . - pp. 2849–2856. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 6 (Mars 2010) . - pp. 2849–2856 Mots-clés : Heat  exchanger;  Networks;  Synthesis;  Utilities Résumé : The synthesis problem of optimal heat exchanger networks using multiple utilities is addressed. A mixed integer nonlinear programming (MINLP) model is developed based on a stagewise superstructure that contains all possible matches between hot and cold streams in every stage. Unlike previous MINLP formulations, exchanges of process streams with utilities are allowed in each stage of the superstructure to determine the optimal location of hot and cold utilities. The optimal choice of different types of available utilities is considered through a disjunctive programming formulation. The model can handle forbidden matches and required and restricted matches as well as isothermal and nonisothermal process streams. The MINLP problem is readily solved using commercial local solvers. Four examples are presented to show the application of the proposed methodology. No computation complications were observed in the examples presented, and they required small CPU times. Note de contenu : Bibogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901750a