Safe-parking of a styrene polymerization process / Rahul Gandhi in Industrial & engineering chemistry research, Vol. 48 N° 15 (Août 2009)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N° 15 (Août 2009) . - pp. 7205–7213 Titre : Safe-parking of a styrene polymerization process Type de document : texte imprimé Auteurs : Rahul Gandhi, Auteur ; Dave Baldwin, Auteur ; Prashant Mhaskar, Auteur Année de publication : 2009 Article en page(s) : pp. 7205–7213 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Nitroxide-mediated radical polymerization Styrene Lyapunov based model Monomer feed streams Résumé : This work considers the problem of control and fault-handling in living nitroxide-mediated radical polymerization (NMRP) of styrene subject to input constraints. First, a Lyapunov based model predictive controller is designed that allows for an explicit computation of the stability region. Next, a fault in one of the monomer feed streams is considered due to which operation of the reactor at the nominal operating point is no longer possible. It is shown that trying to continue nominal operation using the remaining functioning actuator drives the process to a point resulting in significantly off-spec product. A safe-parking framework is utilized to choose an operating point during fault rectification so that the styrene produced during fault rectification complies with the desired product specifications, and smooth resumption of nominal operation upon fault rectification is achieved. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8019938 [article] Safe-parking of a styrene polymerization process [texte imprimé] / Rahul Gandhi, Auteur ; Dave Baldwin, Auteur ; Prashant Mhaskar, Auteur . - 2009 . - pp. 7205–7213. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 15 (Août 2009) . - pp. 7205–7213 Mots-clés : Nitroxide-mediated radical polymerization Styrene Lyapunov based model Monomer feed streams Résumé : This work considers the problem of control and fault-handling in living nitroxide-mediated radical polymerization (NMRP) of styrene subject to input constraints. First, a Lyapunov based model predictive controller is designed that allows for an explicit computation of the stability region. Next, a fault in one of the monomer feed streams is considered due to which operation of the reactor at the nominal operating point is no longer possible. It is shown that trying to continue nominal operation using the remaining functioning actuator drives the process to a point resulting in significantly off-spec product. A safe-parking framework is utilized to choose an operating point during fault rectification so that the styrene produced during fault rectification complies with the desired product specifications, and smooth resumption of nominal operation upon fault rectification is achieved. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8019938

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