Documents disponibles écrits par cet auteur

Dynamics and control of reactive distillation under multiple steady states based on a nonlinear wave theory / Bo-kyung Kim in Industrial & engineering chemistry research, Vol. 51 N° 50 (Décembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 50 (Décembre 2012) . - pp. 16393–16409 Titre : Dynamics and control of reactive distillation under multiple steady states based on a nonlinear wave theory Type de document : texte imprimé Auteurs : Bo-kyung Kim, Auteur ; Myungwan Han, Auteur Année de publication : 2013 Article en page(s) : pp. 16393–16409 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Distillation  Dynamics Résumé : Reactive distillation, which combines reaction and distillation in a single vessel, is receiving increasing attention because of its great potential for use in process intensification. The superposition of reaction and separation in a single processing unit can introduce new patterns of dynamic behavior such as multiplicity and oscillation. Acetic acid was effectively recovered from its dilute aqueous solution in the form of methyl acetate by reactive distillation. The reactive distillation column converting the acetic acid to the methyl acetate was highly nonlinear and showed steady-state multiplicity under certain conditions. The dynamic behavior of the column under multiple steady states was demonstrated to be well explained by nonlinear wave propagation theory. If the maximum conversion was obtained under the condition where the multiplicity appears, then a conventional control scheme could not deal with the control difficulty due to the multiplicity. A profile position control scheme based on wave propagation theory was proposed for the control of the column under multiple steady states, and the performance of the proposed controller was compared with that of conventional controllers. The proposed control scheme using profile positions as controlled variables was shown to give an excellent performance for the control of the reaction conversion and product purity in the reactive distillation. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300923y [article] Dynamics and control of reactive distillation under multiple steady states based on a nonlinear wave theory [texte imprimé] / Bo-kyung Kim, Auteur ; Myungwan Han, Auteur . - 2013 . - pp. 16393–16409. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 50 (Décembre 2012) . - pp. 16393–16409 Mots-clés : Distillation  Dynamics Résumé : Reactive distillation, which combines reaction and distillation in a single vessel, is receiving increasing attention because of its great potential for use in process intensification. The superposition of reaction and separation in a single processing unit can introduce new patterns of dynamic behavior such as multiplicity and oscillation. Acetic acid was effectively recovered from its dilute aqueous solution in the form of methyl acetate by reactive distillation. The reactive distillation column converting the acetic acid to the methyl acetate was highly nonlinear and showed steady-state multiplicity under certain conditions. The dynamic behavior of the column under multiple steady states was demonstrated to be well explained by nonlinear wave propagation theory. If the maximum conversion was obtained under the condition where the multiplicity appears, then a conventional control scheme could not deal with the control difficulty due to the multiplicity. A profile position control scheme based on wave propagation theory was proposed for the control of the column under multiple steady states, and the performance of the proposed controller was compared with that of conventional controllers. The proposed control scheme using profile positions as controlled variables was shown to give an excellent performance for the control of the reaction conversion and product purity in the reactive distillation. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300923y

Kinetics of polycarbonate glycolysis in ethylene glycol / Dongpil Kim in Industrial & engineering chemistry research, Vol. 48 N°2 (Janvier 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°2 (Janvier 2009) . - p. 685–691 Titre : Kinetics of polycarbonate glycolysis in ethylene glycol Type de document : texte imprimé Auteurs : Dongpil Kim, Auteur ; Bo-kyung Kim, Auteur ; Youngmin Cho, Auteur ; Myungwan Han, Auteur Année de publication : 2009 Article en page(s) : p. 685–691 Note générale : chemical engenireeng Langues : Anglais (eng) Mots-clés : polycarbonate Résumé : Depolymerization of polycarbonate waste by glycolysis using ethylene glycol without catalyst was explored in order to get the monomer bisphenol A (BPA). The depolymerized products were identified by GC/MS and FTIR spectroscopy. The effects of operation variables such as reaction time, reaction temperature, ethylene glycol/polycarbonate (EG/PC) weight ratio, and the kinetics of glycolysis were studied. A maximum yield of BPA of 95.6% was achieved at a reaction temperature of 220 °C for 85 min with an EG/PC weight ratio 4. It was found that the depolymerization reaction has two different activation energies, indicating that the reaction occurs in series. A new model was proposed to explain the depolymerization reaction which consists of a series of reactions: random scission from high molecular weight PC to its solid oligomer, dissolution from the solid oligomer to liquid oligomer, and homogeneous degradation from the liquid oligomer to its monomer, BPA. The activation energies were found to be 98.9 kJ/mol for the random scission reaction, 32.7 kJ/mol for the dissolution, and 355.8 kJ/mol for the homogeneous reaction, respectively. The predicted values by the proposed model were shown in good agreement with the experimental ones. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8010947 [article] Kinetics of polycarbonate glycolysis in ethylene glycol [texte imprimé] / Dongpil Kim, Auteur ; Bo-kyung Kim, Auteur ; Youngmin Cho, Auteur ; Myungwan Han, Auteur . - 2009 . - p. 685–691. chemical engenireeng Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°2 (Janvier 2009) . - p. 685–691 Mots-clés : polycarbonate Résumé : Depolymerization of polycarbonate waste by glycolysis using ethylene glycol without catalyst was explored in order to get the monomer bisphenol A (BPA). The depolymerized products were identified by GC/MS and FTIR spectroscopy. The effects of operation variables such as reaction time, reaction temperature, ethylene glycol/polycarbonate (EG/PC) weight ratio, and the kinetics of glycolysis were studied. A maximum yield of BPA of 95.6% was achieved at a reaction temperature of 220 °C for 85 min with an EG/PC weight ratio 4. It was found that the depolymerization reaction has two different activation energies, indicating that the reaction occurs in series. A new model was proposed to explain the depolymerization reaction which consists of a series of reactions: random scission from high molecular weight PC to its solid oligomer, dissolution from the solid oligomer to liquid oligomer, and homogeneous degradation from the liquid oligomer to its monomer, BPA. The activation energies were found to be 98.9 kJ/mol for the random scission reaction, 32.7 kJ/mol for the dissolution, and 355.8 kJ/mol for the homogeneous reaction, respectively. The predicted values by the proposed model were shown in good agreement with the experimental ones. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8010947