Documents disponibles écrits par cet auteur

Bilevel optimizing control structure for a simulated moving bed process based on a reduced-order model using the cubic spline collocation method / Kiwoong Kim in Industrial & engineering chemistry research, Vol. 49 N° 8 (Avril 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 8 (Avril 2010) . - pp. 3689–3699 Titre : Bilevel optimizing control structure for a simulated moving bed process based on a reduced-order model using the cubic spline collocation method Type de document : texte imprimé Auteurs : Kiwoong Kim, Auteur ; Kwang Soon Lee, Auteur ; Jay H. Lee, Auteur Année de publication : 2010 Article en page(s) : pp. 3689–3699 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Bilevel  Moving  Bed Résumé : A bilevel strategy for optimizing control of a simulated moving bed (SMB) process is proposed. In the lower level, repetitive model predictive control (RMPC) is used to regulate product purities; in the upper level, optimal feed/desorbent flow rates and the switching period are determined. Both levels employ a fundamental SMB model reduced to a set of nonlinear discrete-time dynamic equations using the cubic spline collocation method and exact discretization. For RMPC, the SMB model is linearized successively along the operating trajectories seen in the previous switching period. It is assumed that the flow rates can be varied within a switching period and the average product purities over each switching period can be measured albeit with a significant analysis delay. Numerical studies using linear isotherms showed that the proposed strategy is successful at driving the process to the intended optimum and maintaining it there while robustly regulating the product purities despite various uncertainties. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901121y [article] Bilevel optimizing control structure for a simulated moving bed process based on a reduced-order model using the cubic spline collocation method [texte imprimé] / Kiwoong Kim, Auteur ; Kwang Soon Lee, Auteur ; Jay H. Lee, Auteur . - 2010 . - pp. 3689–3699. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 8 (Avril 2010) . - pp. 3689–3699 Mots-clés : Bilevel  Moving  Bed Résumé : A bilevel strategy for optimizing control of a simulated moving bed (SMB) process is proposed. In the lower level, repetitive model predictive control (RMPC) is used to regulate product purities; in the upper level, optimal feed/desorbent flow rates and the switching period are determined. Both levels employ a fundamental SMB model reduced to a set of nonlinear discrete-time dynamic equations using the cubic spline collocation method and exact discretization. For RMPC, the SMB model is linearized successively along the operating trajectories seen in the previous switching period. It is assumed that the flow rates can be varied within a switching period and the average product purities over each switching period can be measured albeit with a significant analysis delay. Numerical studies using linear isotherms showed that the proposed strategy is successful at driving the process to the intended optimum and maintaining it there while robustly regulating the product purities despite various uncertainties. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901121y

Reduced-heat transfer area reactor for scale-up study of batch cooling crystallization / Huiyong Kim in Industrial & engineering chemistry research, Vol. 48 N° 24 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 11158–11161 Titre : Reduced-heat transfer area reactor for scale-up study of batch cooling crystallization Type de document : texte imprimé Auteurs : Huiyong Kim, Auteur ; Kwang Soon Lee, Auteur Année de publication : 2010 Article en page(s) : pp. 11158–11161 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Reduced-Heat--Transfer--Reactor--Scale-up--Study--Batch  Cooling--Crystallization Résumé : A method to facilitate the scale-up study for batch cooling crystallization using a reactor which has reduced jacket heat transfer area is proposed. It is shown that the thermal behavior of a 30 L or larger reactor can be replicated using a 1 L reactor by blocking a part of the jacket area from the heat transfer to achieve 30 times or larger volume scale-up effect. The proposed method has an additional advantage in that the hydrodynamics are intact and the effects on the thermal behavior can be investigated separately. A usage of the proposed method is demonstrated for seed amount determination in batch cooling crystallization of ammonium sulfate. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900444q [article] Reduced-heat transfer area reactor for scale-up study of batch cooling crystallization [texte imprimé] / Huiyong Kim, Auteur ; Kwang Soon Lee, Auteur . - 2010 . - pp. 11158–11161. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 11158–11161 Mots-clés : Reduced-Heat--Transfer--Reactor--Scale-up--Study--Batch  Cooling--Crystallization Résumé : A method to facilitate the scale-up study for batch cooling crystallization using a reactor which has reduced jacket heat transfer area is proposed. It is shown that the thermal behavior of a 30 L or larger reactor can be replicated using a 1 L reactor by blocking a part of the jacket area from the heat transfer to achieve 30 times or larger volume scale-up effect. The proposed method has an additional advantage in that the hydrodynamics are intact and the effects on the thermal behavior can be investigated separately. A usage of the proposed method is demonstrated for seed amount determination in batch cooling crystallization of ammonium sulfate. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900444q

Reduced-heat transfer area reactor for scale-up study of batch cooling crystallization / Huiyong Kim in Industrial & engineering chemistry research, Vol. 48 N° 24 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 11158–11161 Titre : Reduced-heat transfer area reactor for scale-up study of batch cooling crystallization Type de document : texte imprimé Auteurs : Huiyong Kim, Auteur ; Kwang Soon Lee, Auteur Année de publication : 2010 Article en page(s) : pp. 11158–11161 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Batch  cooling  crystallization  Reactor  Jacket  heat  transfer  area Résumé : A method to facilitate the scale-up study for batch cooling crystallization using a reactor which has reduced jacket heat transfer area is proposed. It is shown that the thermal behavior of a 30 L or larger reactor can be replicated using a 1 L reactor by blocking a part of the jacket area from the heat transfer to achieve 30 times or larger volume scale-up effect. The proposed method has an additional advantage in that the hydrodynamics are intact and the effects on the thermal behavior can be investigated separately. A usage of the proposed method is demonstrated for seed amount determination in batch cooling crystallization of ammonium sulfate. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900444q [article] Reduced-heat transfer area reactor for scale-up study of batch cooling crystallization [texte imprimé] / Huiyong Kim, Auteur ; Kwang Soon Lee, Auteur . - 2010 . - pp. 11158–11161. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 11158–11161 Mots-clés : Batch  cooling  crystallization  Reactor  Jacket  heat  transfer  area Résumé : A method to facilitate the scale-up study for batch cooling crystallization using a reactor which has reduced jacket heat transfer area is proposed. It is shown that the thermal behavior of a 30 L or larger reactor can be replicated using a 1 L reactor by blocking a part of the jacket area from the heat transfer to achieve 30 times or larger volume scale-up effect. The proposed method has an additional advantage in that the hydrodynamics are intact and the effects on the thermal behavior can be investigated separately. A usage of the proposed method is demonstrated for seed amount determination in batch cooling crystallization of ammonium sulfate. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900444q

Use of calorimetry model and batch control technique for scale-up of unseeded batch cooling crystallization of poly(hydroxybenzophenone) / Huiyong Kim in Industrial & engineering chemistry research, Vol. 48 N° 14 (Juillet 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 14 (Juillet 2009) . - pp. 6776–6782 Titre : Use of calorimetry model and batch control technique for scale-up of unseeded batch cooling crystallization of poly(hydroxybenzophenone) Type de document : texte imprimé Auteurs : Huiyong Kim, Auteur ; Yookyung Bang, Auteur ; Kwang Soon Lee, Auteur Année de publication : 2009 Article en page(s) : pp. 6776–6782 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Scale-up  method  Cooling  crystallization  Poly(hydroxybenzophenone)  Crystallization Résumé : A scale-up method to design and implement a cooling profile for unseeded batch cooling crystallization has been investigated. The reduced ratio between the heat-transfer area and the volume during scale-up to a large crystallizer causes an increase in the temperature distribution in the reactor, which can trigger unwanted nucleation around the cold spots of the vessel wall. To address this problem, a method is proposed to design a cooling profile for a scaled-up crystallizer that can replicate the seed-generation stage of a small crystallizer by effectively suppressing the unwanted nucleation. The use of a batch control technique as method of implementing the cooling profile in a large crystallizer is also proposed. Experiments were conducted with a 100 mL reactor and a 5 L scaled-up reactor for the unseeded crystallization of poly(hydroxybenzophenone) (PHBP) to verify the performance of the proposed method. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801039f [article] Use of calorimetry model and batch control technique for scale-up of unseeded batch cooling crystallization of poly(hydroxybenzophenone) [texte imprimé] / Huiyong Kim, Auteur ; Yookyung Bang, Auteur ; Kwang Soon Lee, Auteur . - 2009 . - pp. 6776–6782. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 14 (Juillet 2009) . - pp. 6776–6782 Mots-clés : Scale-up  method  Cooling  crystallization  Poly(hydroxybenzophenone)  Crystallization Résumé : A scale-up method to design and implement a cooling profile for unseeded batch cooling crystallization has been investigated. The reduced ratio between the heat-transfer area and the volume during scale-up to a large crystallizer causes an increase in the temperature distribution in the reactor, which can trigger unwanted nucleation around the cold spots of the vessel wall. To address this problem, a method is proposed to design a cooling profile for a scaled-up crystallizer that can replicate the seed-generation stage of a small crystallizer by effectively suppressing the unwanted nucleation. The use of a batch control technique as method of implementing the cooling profile in a large crystallizer is also proposed. Experiments were conducted with a 100 mL reactor and a 5 L scaled-up reactor for the unseeded crystallization of poly(hydroxybenzophenone) (PHBP) to verify the performance of the proposed method. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801039f