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An algorithm for stabilizing unstable steady states for jacketed nonisothermal continually stirred tank reactors / Farouq S. Mjalli in Industrial & engineering chemistry research, Vol. 48 N° 16 (Août 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 16 (Août 2009) . - pp. 7631–7636 Titre : An algorithm for stabilizing unstable steady states for jacketed nonisothermal continually stirred tank reactors Type de document : texte imprimé Auteurs : Farouq S. Mjalli, Auteur ; N. S. Jayakumar, Auteur Année de publication : 2009 Article en page(s) : pp. 7631–7636 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Continually  stirred  tank  reactors  Steady  states  Cooling  jacket Résumé : The operation of nonisothermal jacketed continually stirred tank reactors (CSTRs) involves a high degree of nonlinearity, and for certain operating conditions this nonlinearity may cause concentration multiplicity at steady state. At these conditions, certain steady states will be unstable and difficult to observe and maintain. The dynamics of the cooling jacket has a profound effect on these conditions and hence should be taken into consideration for the proper reactor design. A novel steady-state design algorithm is presented here to stabilize the CSTR at such conditions. This is achieved by replacing the single CSTR by a cascade of reactors that are capable of stabilizing and maintaining the unstable steady state. The new design approach implements an optimization of the reactors operating parameters to achieve this solution. The implementation of the solution algorithm is shown graphically and also shown is the use of numerical computational optimization solution techniques. For a first order reaction, both solutions were successful at achieving the unstable steady state; however, the numerical solution was more accurate. Simulations of the new design showed that the reactors’ cascades were capable of stabilizing the metastable temperature to a high degree of accuracy. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900072g [article] An algorithm for stabilizing unstable steady states for jacketed nonisothermal continually stirred tank reactors [texte imprimé] / Farouq S. Mjalli, Auteur ; N. S. Jayakumar, Auteur . - 2009 . - pp. 7631–7636. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 16 (Août 2009) . - pp. 7631–7636 Mots-clés : Continually  stirred  tank  reactors  Steady  states  Cooling  jacket Résumé : The operation of nonisothermal jacketed continually stirred tank reactors (CSTRs) involves a high degree of nonlinearity, and for certain operating conditions this nonlinearity may cause concentration multiplicity at steady state. At these conditions, certain steady states will be unstable and difficult to observe and maintain. The dynamics of the cooling jacket has a profound effect on these conditions and hence should be taken into consideration for the proper reactor design. A novel steady-state design algorithm is presented here to stabilize the CSTR at such conditions. This is achieved by replacing the single CSTR by a cascade of reactors that are capable of stabilizing and maintaining the unstable steady state. The new design approach implements an optimization of the reactors operating parameters to achieve this solution. The implementation of the solution algorithm is shown graphically and also shown is the use of numerical computational optimization solution techniques. For a first order reaction, both solutions were successful at achieving the unstable steady state; however, the numerical solution was more accurate. Simulations of the new design showed that the reactors’ cascades were capable of stabilizing the metastable temperature to a high degree of accuracy. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900072g