Documents disponibles écrits par cet auteur

Experimental verification of bilevel optimizing control for SMB technology / Kiwoong Kim in Industrial & engineering chemistry research, Vol. 49 N° 18 (Septembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8593–8600 Titre : Experimental verification of bilevel optimizing control for SMB technology Type de document : texte imprimé Auteurs : Kiwoong Kim, Auteur ; Jin-Il Kim, Auteur ; Huiyong Kim, Auteur Année de publication : 2010 Article en page(s) : pp. 8593–8600 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Optimizing  control  technique Résumé : An experimental study has been conducted to evaluate the bilevel optimizing control technique for simulated moving beds (SMBs) that was proposed in a previous article (Kim et al. Ind. Eng. Chem. Res. 2010, 49, 3689−3699). Off-line optimization provides optimum time-varying flow rates for feed and desorbent in the upper level, and repetitive model-based predictive control (RMPC) is performed for regulation of the extract and raffinate purities in the lower level. Experiments have been carried out in a four-zone SMB system packed with Dow 50WX4 400-mesh resin to separate l-ribose and l-arabinose at 99.7 vol% from their mixture dissolved in water. The optimizing control technique was implemented just as in the numerical study in the previous work, except for some minor customization. In the experiments, RMPC revealed quite satisfactory tracking and disturbance rejection performance. Optimization resulted in a 45% increase in productivity and a 12% decrease in desorbent consumption from an arbitrary initial point, and the cascaded RMPC law tightly maintained the product purities at their set points by effectively compensating the changes in the feed and desorbent flow rates. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1000218 [article] Experimental verification of bilevel optimizing control for SMB technology [texte imprimé] / Kiwoong Kim, Auteur ; Jin-Il Kim, Auteur ; Huiyong Kim, Auteur . - 2010 . - pp. 8593–8600. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8593–8600 Mots-clés : Optimizing  control  technique Résumé : An experimental study has been conducted to evaluate the bilevel optimizing control technique for simulated moving beds (SMBs) that was proposed in a previous article (Kim et al. Ind. Eng. Chem. Res. 2010, 49, 3689−3699). Off-line optimization provides optimum time-varying flow rates for feed and desorbent in the upper level, and repetitive model-based predictive control (RMPC) is performed for regulation of the extract and raffinate purities in the lower level. Experiments have been carried out in a four-zone SMB system packed with Dow 50WX4 400-mesh resin to separate l-ribose and l-arabinose at 99.7 vol% from their mixture dissolved in water. The optimizing control technique was implemented just as in the numerical study in the previous work, except for some minor customization. In the experiments, RMPC revealed quite satisfactory tracking and disturbance rejection performance. Optimization resulted in a 45% increase in productivity and a 12% decrease in desorbent consumption from an arbitrary initial point, and the cascaded RMPC law tightly maintained the product purities at their set points by effectively compensating the changes in the feed and desorbent flow rates. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1000218

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