Documents disponibles écrits par cet auteur

Experimental design of topological curves to safely optimize highly exothermic complex reacting systems / Sabrina Copelli in Industrial & engineering chemistry research, Vol. 50 N° 17 (Septembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 17 (Septembre 2011) . - pp. 9910-9917 Titre : Experimental design of topological curves to safely optimize highly exothermic complex reacting systems Type de document : texte imprimé Auteurs : Sabrina Copelli, Auteur ; Marco Derudi, Auteur ; Renato Rota, Auteur Année de publication : 2011 Article en page(s) : pp. 9910-9917 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Experimental  design Résumé : Strongly exothermic solution homopolymerizations are a class of chain reactions particularly difficult to be optimized from both a safety and a productivity viewpoint. Particularly, lots of side undesired reactions (e.g., backbiting, propagation of tertiary radicals, chain transfer to monomer or solvent, etc.), which affect the selectivity with respect to the desired product, and relevant mass and heat transfer problems, due to the increasing system viscosity, take place during such syntheses. Under these unavoidable operating conditions, it is difficult to employ theoretical procedures that are able to safely optimize the analyzed process, because the development of a reliable mathematical model is often not affordable or too time-consuming. In this work, it is shown that the topological criterion theory and its related optimization procedure can be used to optimize experimentally (through a dedicated set of isoperibolic reaction calorimetry tests) a complex reacting system even if its reaction scheme and all information about the kinetics are not available. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24483634 [article] Experimental design of topological curves to safely optimize highly exothermic complex reacting systems [texte imprimé] / Sabrina Copelli, Auteur ; Marco Derudi, Auteur ; Renato Rota, Auteur . - 2011 . - pp. 9910-9917. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 17 (Septembre 2011) . - pp. 9910-9917 Mots-clés : Experimental  design Résumé : Strongly exothermic solution homopolymerizations are a class of chain reactions particularly difficult to be optimized from both a safety and a productivity viewpoint. Particularly, lots of side undesired reactions (e.g., backbiting, propagation of tertiary radicals, chain transfer to monomer or solvent, etc.), which affect the selectivity with respect to the desired product, and relevant mass and heat transfer problems, due to the increasing system viscosity, take place during such syntheses. Under these unavoidable operating conditions, it is difficult to employ theoretical procedures that are able to safely optimize the analyzed process, because the development of a reliable mathematical model is often not affordable or too time-consuming. In this work, it is shown that the topological criterion theory and its related optimization procedure can be used to optimize experimentally (through a dedicated set of isoperibolic reaction calorimetry tests) a complex reacting system even if its reaction scheme and all information about the kinetics are not available. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24483634

Influence of large obstacles and mitigation barriers on heavy gas cloud dispersion / Valentina Busini in Industrial & engineering chemistry research, Vol. 51 N° 22 (Juin 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 22 (Juin 2012) . - pp. 7643–7650 Titre : Influence of large obstacles and mitigation barriers on heavy gas cloud dispersion : A liquefied natural gas case - study Type de document : texte imprimé Auteurs : Valentina Busini, Auteur ; Massimiliano Lino, Auteur ; Renato Rota, Auteur Année de publication : 2012 Article en page(s) : pp. 7643–7650 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Liquefied  natural  gas Résumé : The study of the consequences of heavy gases releases is of paramount importance in the safety analysis because of the large damage areas involved. The Computational Fluid Dynamics (CFD) models, unlike the integral ones that are simpler and faster, allow for a complete description of complex geometries, such as those involved in industrial plants or urban areas. In this work, the effect of typical large obstacles present in a real plant has been studied. Moreover, to verify the effectiveness of mitigation barriers on the dispersion of clouds produced by massive release of heavy gases, several types of walls have been investigated by analyzing the induced changes in the hazardous area. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201591b [article] Influence of large obstacles and mitigation barriers on heavy gas cloud dispersion : A liquefied natural gas case - study [texte imprimé] / Valentina Busini, Auteur ; Massimiliano Lino, Auteur ; Renato Rota, Auteur . - 2012 . - pp. 7643–7650. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 22 (Juin 2012) . - pp. 7643–7650 Mots-clés : Liquefied  natural  gas Résumé : The study of the consequences of heavy gases releases is of paramount importance in the safety analysis because of the large damage areas involved. The Computational Fluid Dynamics (CFD) models, unlike the integral ones that are simpler and faster, allow for a complete description of complex geometries, such as those involved in industrial plants or urban areas. In this work, the effect of typical large obstacles present in a real plant has been studied. Moreover, to verify the effectiveness of mitigation barriers on the dispersion of clouds produced by massive release of heavy gases, several types of walls have been investigated by analyzing the induced changes in the hazardous area. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201591b

Simple procedure for optimal scale-up of fine chemical processes. II. nitration of 4-chlorobenzotrifluoride / Francesco Maestri 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. 1316–1324 Titre : Simple procedure for optimal scale-up of fine chemical processes. II. nitration of 4-chlorobenzotrifluoride Type de document : texte imprimé Auteurs : Francesco Maestri, Auteur ; Sabrina Copelli, Auteur ; Renato Rota, Auteur Année de publication : 2009 Article en page(s) : p. 1316–1324 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Chemical  Processes  Industrial  reactor Résumé : In this work, a simple and general procedure for optimally scaling-up exothermic semibatch processes has been applied to the analysis of a nitration reaction performed in the agrochemical industry for the production of an important class of herbicides. Such a reaction is performed in indirectly cooled semibatch reactors in which the species to be nitrated is added to a mixture of sulfuric and nitric acid, forming a heterogeneous (liquid−liquid) system. Adiabatic calorimetric experiments performed in an ARC equipment showed that the reaction in question belongs to the most critical class of exothermic reaction processes, for which maximum attainable temperature due to synthesis reaction (MTSR) is, at the same time, higher than system decomposition temperature and lower than boiling temperature of the reaction mass. It has been verified, through reaction calorimetry experiments (performed in an RC1 equipment), that the optimization−scale-up procedure previously developed allows, with minimum calculation and experimental effort, both for a selection, at laboratory scale, of operating conditions characterized by a rapid coreactant consumption and for their safe scale-up, maximizing industrial reactor productivity. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800466n [article] Simple procedure for optimal scale-up of fine chemical processes. II. nitration of 4-chlorobenzotrifluoride [texte imprimé] / Francesco Maestri, Auteur ; Sabrina Copelli, Auteur ; Renato Rota, Auteur . - 2009 . - p. 1316–1324. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1316–1324 Mots-clés : Chemical  Processes  Industrial  reactor Résumé : In this work, a simple and general procedure for optimally scaling-up exothermic semibatch processes has been applied to the analysis of a nitration reaction performed in the agrochemical industry for the production of an important class of herbicides. Such a reaction is performed in indirectly cooled semibatch reactors in which the species to be nitrated is added to a mixture of sulfuric and nitric acid, forming a heterogeneous (liquid−liquid) system. Adiabatic calorimetric experiments performed in an ARC equipment showed that the reaction in question belongs to the most critical class of exothermic reaction processes, for which maximum attainable temperature due to synthesis reaction (MTSR) is, at the same time, higher than system decomposition temperature and lower than boiling temperature of the reaction mass. It has been verified, through reaction calorimetry experiments (performed in an RC1 equipment), that the optimization−scale-up procedure previously developed allows, with minimum calculation and experimental effort, both for a selection, at laboratory scale, of operating conditions characterized by a rapid coreactant consumption and for their safe scale-up, maximizing industrial reactor productivity. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800466n

Simple procedure for optimally scaling-up fine chemical processes. I. practical tools / Francesco Maestri 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. 1307–1315 Titre : Simple procedure for optimally scaling-up fine chemical processes. I. practical tools Type de document : texte imprimé Auteurs : Francesco Maestri, Auteur ; Sabrina Copelli, Auteur ; Renato Rota, Auteur Année de publication : 2009 Article en page(s) : p. 1307–1315 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Chemical  processes  Industrial  reactor Résumé : A simple and general scale-up procedure, based on boundary and temperature diagram safety criteria for exothermic semibatch reactors (SBRs), has been developed. Such a procedure is based on a few graphical correlations that allow end users, dealing with homogeneous as well as heterogeneous SBRs (with or without autocatalytic behavior), an easy selection of safe operating conditions at the laboratory scale and for their scale-up to the industrial one, maximizing at the same time the industrial reactor productivity. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800465d [article] Simple procedure for optimally scaling-up fine chemical processes. I. practical tools [texte imprimé] / Francesco Maestri, Auteur ; Sabrina Copelli, Auteur ; Renato Rota, Auteur . - 2009 . - p. 1307–1315. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1307–1315 Mots-clés : Chemical  processes  Industrial  reactor Résumé : A simple and general scale-up procedure, based on boundary and temperature diagram safety criteria for exothermic semibatch reactors (SBRs), has been developed. Such a procedure is based on a few graphical correlations that allow end users, dealing with homogeneous as well as heterogeneous SBRs (with or without autocatalytic behavior), an easy selection of safe operating conditions at the laboratory scale and for their scale-up to the industrial one, maximizing at the same time the industrial reactor productivity. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800465d

Topological criteria to safely optimize hazardous chemical processes involving consecutive reactions / Sabrina Copelli 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. 4583–4593 Titre : Topological criteria to safely optimize hazardous chemical processes involving consecutive reactions Type de document : texte imprimé Auteurs : Sabrina Copelli, Auteur ; Marco Derudi, Auteur ; Renato Rota, Auteur Année de publication : 2010 Article en page(s) : pp. 4583–4593 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Chemical  Processes Résumé : Safe operating conditions, for strongly exothermic chemical systems involving multiple reactions, are particularly critical to be obtained, because of the complex interactions between selectivity and safety constraints. In this work, new criteria, which are useful for isoperibolic semibatch processes involving consecutive reactions and based on the topology of a particular phase space, are presented. Such criteria are able to detect both the runaway boundary and the so-called “quick onset, fair conversion, smooth temperature profile” (QFS) operating region by performing a topological analysis of the phase space of the system of ordinary differential equations (ODEs) that describe the analyzed process. Moreover, a safe optimization procedure, the objective of which is to obtain the optimum values both of the dosing time of the dosed reactant and the initial reactor temperature, based on such criteria, has been developed. Finally, such a set of optimum operating parameters has been validated through a comparison with experimental data from published literature. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901679q [article] Topological criteria to safely optimize hazardous chemical processes involving consecutive reactions [texte imprimé] / Sabrina Copelli, Auteur ; Marco Derudi, Auteur ; Renato Rota, Auteur . - 2010 . - pp. 4583–4593. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 10 (Mai 2010) . - pp. 4583–4593 Mots-clés : Chemical  Processes Résumé : Safe operating conditions, for strongly exothermic chemical systems involving multiple reactions, are particularly critical to be obtained, because of the complex interactions between selectivity and safety constraints. In this work, new criteria, which are useful for isoperibolic semibatch processes involving consecutive reactions and based on the topology of a particular phase space, are presented. Such criteria are able to detect both the runaway boundary and the so-called “quick onset, fair conversion, smooth temperature profile” (QFS) operating region by performing a topological analysis of the phase space of the system of ordinary differential equations (ODEs) that describe the analyzed process. Moreover, a safe optimization procedure, the objective of which is to obtain the optimum values both of the dosing time of the dosed reactant and the initial reactor temperature, based on such criteria, has been developed. Finally, such a set of optimum operating parameters has been validated through a comparison with experimental data from published literature. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901679q