Documents disponibles écrits par cet auteur

Introduction of a breakage probability function in the hydrocracking reactor model / Simone Gamba in Industrial & engineering chemistry research, Vol. 48 N° 12 (Juin 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5656–5665 Titre : Introduction of a breakage probability function in the hydrocracking reactor model Type de document : texte imprimé Auteurs : Simone Gamba, Auteur ; Laura A. Pellegrini, Auteur ; Vincenzo Calemma, Auteur Année de publication : 2009 Article en page(s) : pp. 5656–5665 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : C-C  bonds  Fischer-Tropsch  waxes  Reactor  model  Hydrocracking Résumé : This paper shows how a breakage probability function for the C−C bonds, elaborated from experimental evidence reported in literature, is introduced in the reactor model for the hydrocracking of Fischer−Tropsch waxes. The results demonstrate a better response to the variation of the operating conditions (especially as concerns temperature) and show product distributions closer to the experimental ones than those predicted by the previous model [Pellegrini, L. A. et al. Chem. Eng. Sci. 2008, 63, 4285]. The agreement with the experimental data has also been enhanced introducing a dependence on temperature (in addition to the dependence on the number of carbon atoms) in the expressions for the Langmuir constants and giving the equilibrium constants for isomerization reactions a new function derived from a thermodynamic study. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8019455 [article] Introduction of a breakage probability function in the hydrocracking reactor model [texte imprimé] / Simone Gamba, Auteur ; Laura A. Pellegrini, Auteur ; Vincenzo Calemma, Auteur . - 2009 . - pp. 5656–5665. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5656–5665 Mots-clés : C-C  bonds  Fischer-Tropsch  waxes  Reactor  model  Hydrocracking Résumé : This paper shows how a breakage probability function for the C−C bonds, elaborated from experimental evidence reported in literature, is introduced in the reactor model for the hydrocracking of Fischer−Tropsch waxes. The results demonstrate a better response to the variation of the operating conditions (especially as concerns temperature) and show product distributions closer to the experimental ones than those predicted by the previous model [Pellegrini, L. A. et al. Chem. Eng. Sci. 2008, 63, 4285]. The agreement with the experimental data has also been enhanced introducing a dependence on temperature (in addition to the dependence on the number of carbon atoms) in the expressions for the Langmuir constants and giving the equilibrium constants for isomerization reactions a new function derived from a thermodynamic study. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8019455

Using an adaptive parameter method for process simulation of nonideal systems / Laura A. Pellegrini 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. 4923–4932 Titre : Using an adaptive parameter method for process simulation of nonideal systems Type de document : texte imprimé Auteurs : Laura A. Pellegrini, Auteur ; Simone Gamba, Auteur ; Stefania Moioli, Auteur Année de publication : 2010 Article en page(s) : pp. 4923–4932 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Process  Simulation  Nonideal  Systems Résumé : A thermodynamic model of the / class of methods that can be easily used with commercial process simulators is proposed. The vapor−liquid equilibrium (VLE) is calculated by means of a Redlich−Kwong-type equation of state (EoS) that uses modified Huron−Vidal mixing rules with activity coefficients: the activity coefficients are derived from the NRTL model whose parameters are evaluated by fitting VLE data of binary mixtures. By means of the Aspen PLUS process simulator, a comparison is made between the performances of both the proposed method with user-created adaptive parameters that can be forced into the simulator database and the Predictive−Soave−Redlich−Kwong (PSRK) method that uses UNIFAC to compute the excess free energy. The ethanol−water separation by extractive distillation is analyzed to point out how an incorrect prediction of the azeotrope can lead to underestimation of the overall process energy requirement. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901773q [article] Using an adaptive parameter method for process simulation of nonideal systems [texte imprimé] / Laura A. Pellegrini, Auteur ; Simone Gamba, Auteur ; Stefania Moioli, Auteur . - 2010 . - pp. 4923–4932. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 10 (Mai 2010) . - pp. 4923–4932 Mots-clés : Process  Simulation  Nonideal  Systems Résumé : A thermodynamic model of the / class of methods that can be easily used with commercial process simulators is proposed. The vapor−liquid equilibrium (VLE) is calculated by means of a Redlich−Kwong-type equation of state (EoS) that uses modified Huron−Vidal mixing rules with activity coefficients: the activity coefficients are derived from the NRTL model whose parameters are evaluated by fitting VLE data of binary mixtures. By means of the Aspen PLUS process simulator, a comparison is made between the performances of both the proposed method with user-created adaptive parameters that can be forced into the simulator database and the Predictive−Soave−Redlich−Kwong (PSRK) method that uses UNIFAC to compute the excess free energy. The ethanol−water separation by extractive distillation is analyzed to point out how an incorrect prediction of the azeotrope can lead to underestimation of the overall process energy requirement. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901773q