Documents disponibles écrits par cet auteur

Dynamic simulation of rosemary essential oil extraction in an industrial steam distillation unit / Rafael B. Sartor in Industrial & engineering chemistry research, Vol. 50 N° 7 (Avril 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 7 (Avril 2011) . - pp. 3955-3959 Titre : Dynamic simulation of rosemary essential oil extraction in an industrial steam distillation unit Type de document : texte imprimé Auteurs : Rafael B. Sartor, Auteur ; Argimiro R. Secchi, Auteur ; Rafael de P. Soares, Auteur Année de publication : 2011 Article en page(s) : pp. 3955-3959 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Modeling  Steam  distillation  Essential  oil  Dynamic  model Résumé : This work presents the dynamic simulation of rosemary essential oil extraction by steam-distillation. Experimental data acquired in an industrial steam-distillation unit were used to estimate the model parameters. Two distinct climatic conditions (summer and winter) were used to verify the model flexibility. In winter condition, two time-dependent experimental data curves were used together to verify the parameter estimation strategy, whereas in summer condition, two time-dependent curves were used for parameter estimation and a third one for model validation with respect to prediction. The mathematical model fitted satisfactorily both set of industrial data, resulting, for the summer and winter, in global mass transfer coefficient of 8.64 x 10―4s―1 and 9.10 × 10―4 s ―1, and equilibrium constant 2.72 x 10―4 m3/kg and 1.07 x 10―2m3/kg, respectively. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24027641 [article] Dynamic simulation of rosemary essential oil extraction in an industrial steam distillation unit [texte imprimé] / Rafael B. Sartor, Auteur ; Argimiro R. Secchi, Auteur ; Rafael de P. Soares, Auteur . - 2011 . - pp. 3955-3959. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 7 (Avril 2011) . - pp. 3955-3959 Mots-clés : Modeling  Steam  distillation  Essential  oil  Dynamic  model Résumé : This work presents the dynamic simulation of rosemary essential oil extraction by steam-distillation. Experimental data acquired in an industrial steam-distillation unit were used to estimate the model parameters. Two distinct climatic conditions (summer and winter) were used to verify the model flexibility. In winter condition, two time-dependent experimental data curves were used together to verify the parameter estimation strategy, whereas in summer condition, two time-dependent curves were used for parameter estimation and a third one for model validation with respect to prediction. The mathematical model fitted satisfactorily both set of industrial data, resulting, for the summer and winter, in global mass transfer coefficient of 8.64 x 10―4s―1 and 9.10 × 10―4 s ―1, and equilibrium constant 2.72 x 10―4 m3/kg and 1.07 x 10―2m3/kg, respectively. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24027641

Prediction of infinite - dilution activity coefficients using UNIFAC and COSMO - SAC variants / Renan P. Gerber in Industrial & engineering chemistry research, Vol. 49 N° 16 (Août 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 16 (Août 2010) . - pp. 7488–7496 Titre : Prediction of infinite - dilution activity coefficients using UNIFAC and COSMO - SAC variants Type de document : texte imprimé Auteurs : Renan P. Gerber, Auteur ; Rafael de P. Soares, Auteur Année de publication : 2010 Article en page(s) : pp. 7488–7496 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Chemical  equilibriums. Résumé : Infinite-dilution activity coefficients (IDAC) can be used to predict, for example, the behavior of liquid−liquid equilibrium or to determine parameters for excess Gibbs free energy expressions like NRTL, Wilson, or UNIQUAC. For systems where limited (or no) experimental data are available, predictive tools as the well-known UNIFAC variations can be very helpful. An alternative approach is to use methods based on conductor-like screening model (COSMO). In this work, we have tested a modified UNIFAC model with a recent parameter set and three variations of the COSMO-SAC model. To compare the models, a database with a total of 748 IDAC experimental points was assembled with data from the literature and is available as Supporting Information. For nonaqueous solutions, the IDAC logarithm absolute average deviation for UNIFAC was 0.28, while it was 0.48 for a COSMO-SAC with parameters adjusted in this work. On the other hand, for aqueous systems, a COSMO-SAC with optimized parameters led to a deviation of 0.81 against 1.47 for the UNIFAC model tested. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901947m [article] Prediction of infinite - dilution activity coefficients using UNIFAC and COSMO - SAC variants [texte imprimé] / Renan P. Gerber, Auteur ; Rafael de P. Soares, Auteur . - 2010 . - pp. 7488–7496. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 16 (Août 2010) . - pp. 7488–7496 Mots-clés : Chemical  equilibriums. Résumé : Infinite-dilution activity coefficients (IDAC) can be used to predict, for example, the behavior of liquid−liquid equilibrium or to determine parameters for excess Gibbs free energy expressions like NRTL, Wilson, or UNIQUAC. For systems where limited (or no) experimental data are available, predictive tools as the well-known UNIFAC variations can be very helpful. An alternative approach is to use methods based on conductor-like screening model (COSMO). In this work, we have tested a modified UNIFAC model with a recent parameter set and three variations of the COSMO-SAC model. To compare the models, a database with a total of 748 IDAC experimental points was assembled with data from the literature and is available as Supporting Information. For nonaqueous solutions, the IDAC logarithm absolute average deviation for UNIFAC was 0.28, while it was 0.48 for a COSMO-SAC with parameters adjusted in this work. On the other hand, for aqueous systems, a COSMO-SAC with optimized parameters led to a deviation of 0.81 against 1.47 for the UNIFAC model tested. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901947m