Documents disponibles écrits par cet auteur

Dynamic control of a Column/Side-Reactor process / Devrim B. Kaymak ; William L. Luyben in Industrial & engineering chemistry research, Vol. 47 n°22 (Novembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°22 (Novembre 2008) . - p. 8704–8712 Titre : Dynamic control of a Column/Side-Reactor process Type de document : texte imprimé Auteurs : Devrim B. Kaymak, Auteur ; William L. Luyben, Auteur Année de publication : 2008 Article en page(s) : p. 8704–8712 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Dynamic  Control Résumé : If the temperature range suitable for reasonable chemical reaction kinetics does not match the temperature range suitable for vapor−liquid equilibrium, reactive columns are not economically attractive. One way to overcome this temperature mismatch is use a flowsheet that features a distillation column with multiple side reactors. The column operates at a pressure that gives temperatures favorable for separation, while the reactors operate at temperatures (and pressures) favorable for reaction kinetics. This paper discusses the controllability of a column/side-reactor process based on the steady-state design studied by Kaymak and Luyben.(1) The performances of two different control structures are explored. The first uses two temperature controllers, one with direct action and the other with reverse action. The second control structure uses an internal composition analyzer. One of the main conclusions is that the opposite actions of controllers in the two-temperature control structure result in a composition breakthrough that moves the column to a different operating condition. The composition and temperature controllers in the second structure have the same action and provide reasonably effective control. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie701705m [article] Dynamic control of a Column/Side-Reactor process [texte imprimé] / Devrim B. Kaymak, Auteur ; William L. Luyben, Auteur . - 2008 . - p. 8704–8712. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°22 (Novembre 2008) . - p. 8704–8712 Mots-clés : Dynamic  Control Résumé : If the temperature range suitable for reasonable chemical reaction kinetics does not match the temperature range suitable for vapor−liquid equilibrium, reactive columns are not economically attractive. One way to overcome this temperature mismatch is use a flowsheet that features a distillation column with multiple side reactors. The column operates at a pressure that gives temperatures favorable for separation, while the reactors operate at temperatures (and pressures) favorable for reaction kinetics. This paper discusses the controllability of a column/side-reactor process based on the steady-state design studied by Kaymak and Luyben.(1) The performances of two different control structures are explored. The first uses two temperature controllers, one with direct action and the other with reverse action. The second control structure uses an internal composition analyzer. One of the main conclusions is that the opposite actions of controllers in the two-temperature control structure result in a composition breakthrough that moves the column to a different operating condition. The composition and temperature controllers in the second structure have the same action and provide reasonably effective control. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie701705m

Effect of Feed Tray Location on Temperature-Based Inferential Control of Double Feed Reactive Distillation Columns / Gülşah Sunar 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. 11071–11080 Titre : Effect of Feed Tray Location on Temperature-Based Inferential Control of Double Feed Reactive Distillation Columns Type de document : texte imprimé Auteurs : Gülşah Sunar, Auteur ; Devrim B. Kaymak, Auteur Année de publication : 2010 Article en page(s) : pp. 11071–11080 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Effect--Feed  --Location--Temperature-Based--Inferential--Control--Double--Reactive--Distillation--Columns Résumé : Adjusting the feed tray locations may result in significant energy savings for double feed reactive distillation columns. In the literature, composition-based control structures have been suggested for the internally heat integrated designs of ideal reactive distillation columns. This paper explores the effect of feed tray location on the controllability of ideal reactive distillation columns using temperature-based control structures. Two different types of two-temperature inferential control structures are considered. In the first structure, two fresh feed flow rates are manipulated to control the temperatures on two selected trays. In the second structure, the light fresh feed flow rate and the vapor boilup are manipulated. Alternative designs are created by moving the feed trays in and out of the reactive zone. It is demonstrated that significant energy savings are obtained by shifting the feed tray locations into the reactive zone. The results indicate that there are internally heat integrated designs, which can be effectively controlled by a two-temperature inferential control structure without using any direct composition measurement. For the case study examined, a 13.17% energy saving is obtained by shifting the fresh feed trays into the reactive zone by two trays from their conventional locations. The second temperature-based control structure considered can handle fairly large throughput changes without any system shut down or steady-state transition for this energy-efficient design. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901142s [article] Effect of Feed Tray Location on Temperature-Based Inferential Control of Double Feed Reactive Distillation Columns [texte imprimé] / Gülşah Sunar, Auteur ; Devrim B. Kaymak, Auteur . - 2010 . - pp. 11071–11080. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 11071–11080 Mots-clés : Effect--Feed  --Location--Temperature-Based--Inferential--Control--Double--Reactive--Distillation--Columns Résumé : Adjusting the feed tray locations may result in significant energy savings for double feed reactive distillation columns. In the literature, composition-based control structures have been suggested for the internally heat integrated designs of ideal reactive distillation columns. This paper explores the effect of feed tray location on the controllability of ideal reactive distillation columns using temperature-based control structures. Two different types of two-temperature inferential control structures are considered. In the first structure, two fresh feed flow rates are manipulated to control the temperatures on two selected trays. In the second structure, the light fresh feed flow rate and the vapor boilup are manipulated. Alternative designs are created by moving the feed trays in and out of the reactive zone. It is demonstrated that significant energy savings are obtained by shifting the feed tray locations into the reactive zone. The results indicate that there are internally heat integrated designs, which can be effectively controlled by a two-temperature inferential control structure without using any direct composition measurement. For the case study examined, a 13.17% energy saving is obtained by shifting the fresh feed trays into the reactive zone by two trays from their conventional locations. The second temperature-based control structure considered can handle fairly large throughput changes without any system shut down or steady-state transition for this energy-efficient design. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901142s

Effect of feed tray location on temperature-based inferential control of double feed reactive distillation columns / Gülsah Sunar 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. 11071–11080 Titre : Effect of feed tray location on temperature-based inferential control of double feed reactive distillation columns Type de document : texte imprimé Auteurs : Gülsah Sunar, Auteur ; Devrim B. Kaymak, Auteur Année de publication : 2010 Article en page(s) : pp. 11071–11080 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Feed  tray  location  Reactive  distillation  columns Résumé : Adjusting the feed tray locations may result in significant energy savings for double feed reactive distillation columns. In the literature, composition-based control structures have been suggested for the internally heat integrated designs of ideal reactive distillation columns. This paper explores the effect of feed tray location on the controllability of ideal reactive distillation columns using temperature-based control structures. Two different types of two-temperature inferential control structures are considered. In the first structure, two fresh feed flow rates are manipulated to control the temperatures on two selected trays. In the second structure, the light fresh feed flow rate and the vapor boilup are manipulated. Alternative designs are created by moving the feed trays in and out of the reactive zone. It is demonstrated that significant energy savings are obtained by shifting the feed tray locations into the reactive zone. The results indicate that there are internally heat integrated designs, which can be effectively controlled by a two-temperature inferential control structure without using any direct composition measurement. For the case study examined, a 13.17% energy saving is obtained by shifting the fresh feed trays into the reactive zone by two trays from their conventional locations. The second temperature-based control structure considered can handle fairly large throughput changes without any system shut down or steady-state transition for this energy-efficient design. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901142s [article] Effect of feed tray location on temperature-based inferential control of double feed reactive distillation columns [texte imprimé] / Gülsah Sunar, Auteur ; Devrim B. Kaymak, Auteur . - 2010 . - pp. 11071–11080. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 11071–11080 Mots-clés : Feed  tray  location  Reactive  distillation  columns Résumé : Adjusting the feed tray locations may result in significant energy savings for double feed reactive distillation columns. In the literature, composition-based control structures have been suggested for the internally heat integrated designs of ideal reactive distillation columns. This paper explores the effect of feed tray location on the controllability of ideal reactive distillation columns using temperature-based control structures. Two different types of two-temperature inferential control structures are considered. In the first structure, two fresh feed flow rates are manipulated to control the temperatures on two selected trays. In the second structure, the light fresh feed flow rate and the vapor boilup are manipulated. Alternative designs are created by moving the feed trays in and out of the reactive zone. It is demonstrated that significant energy savings are obtained by shifting the feed tray locations into the reactive zone. The results indicate that there are internally heat integrated designs, which can be effectively controlled by a two-temperature inferential control structure without using any direct composition measurement. For the case study examined, a 13.17% energy saving is obtained by shifting the fresh feed trays into the reactive zone by two trays from their conventional locations. The second temperature-based control structure considered can handle fairly large throughput changes without any system shut down or steady-state transition for this energy-efficient design. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901142s

Effect of relative volatilities on inferential temperature control of reactive distillation columns / Devrim B. Kaymak in Industrial & engineering chemistry research, Vol. 50 N° 13 (Juillet 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 8138-8152 Titre : Effect of relative volatilities on inferential temperature control of reactive distillation columns Type de document : texte imprimé Auteurs : Devrim B. Kaymak, Auteur ; Denizhan Yilmaz, Auteur ; Ahmet Z. Gurer, Auteur Année de publication : 2011 Article en page(s) : pp. 8138-8152 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Distillation  column  Distillation  with  reaction  Temperature  control Résumé : Several control structures for different types of reactive distillation columns have been studied in the literature. In general, these are the ternary systems with the chemistry A + B ↔ C and the quaternary systems with the Chemistry A+B ↔ C + D. In some cases, the ternary system may also contain an additional component I which is inert in terms of reaction. The growing literature includes both ideal generic and real chemical systems. However, all papers dealing with ideal generic systems assume constant relative volatilities between adjacent components. This paper explores the effect of temperature-dependent relative volatilities on inferential temperature control of reactive distillation columns. Three types of chemical systems are considered: a ternary system without inert component, a ternary system with inert component, and a quaternary system. Significant differences are observed between the results of these systems. The inferential control structure ofthe ternary system without inert provides effective control for any case of relative volatilities. However, there are some offset in bottoms and distillate compositions of quaternary system. The results illustrate that the magnitude of the offset in distillate composition increases significantly with the increase in the temperature-dependency of relative volatility. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332139 [article] Effect of relative volatilities on inferential temperature control of reactive distillation columns [texte imprimé] / Devrim B. Kaymak, Auteur ; Denizhan Yilmaz, Auteur ; Ahmet Z. Gurer, Auteur . - 2011 . - pp. 8138-8152. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 8138-8152 Mots-clés : Distillation  column  Distillation  with  reaction  Temperature  control Résumé : Several control structures for different types of reactive distillation columns have been studied in the literature. In general, these are the ternary systems with the chemistry A + B ↔ C and the quaternary systems with the Chemistry A+B ↔ C + D. In some cases, the ternary system may also contain an additional component I which is inert in terms of reaction. The growing literature includes both ideal generic and real chemical systems. However, all papers dealing with ideal generic systems assume constant relative volatilities between adjacent components. This paper explores the effect of temperature-dependent relative volatilities on inferential temperature control of reactive distillation columns. Three types of chemical systems are considered: a ternary system without inert component, a ternary system with inert component, and a quaternary system. Significant differences are observed between the results of these systems. The inferential control structure ofthe ternary system without inert provides effective control for any case of relative volatilities. However, there are some offset in bottoms and distillate compositions of quaternary system. The results illustrate that the magnitude of the offset in distillate composition increases significantly with the increase in the temperature-dependency of relative volatility. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332139

Inferential Temperature control structures for different types of two-reactant reactive distillation systems / Devrim B. Kaymak in Industrial & engineering chemistry research, Vol. 50 N° 11 (Juin 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 11 (Juin 2011) . - pp. 6777-6793 Titre : Inferential Temperature control structures for different types of two-reactant reactive distillation systems Type de document : texte imprimé Auteurs : Devrim B. Kaymak, Auteur ; Denizhan Yilmaz, Auteur ; Ahmet Z. Gurer, Auteur Année de publication : 2011 Article en page(s) : pp. 6777-6793 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Distillation  with  reaction  Temperature  control Résumé : The control performance of three types of two-temperature inferential control structures for the economic optimum designs of two-reactant ideal reactive distillation systems is evaluated. Three commonly encountered reaction chemistries are studied, namely, a single-product ternary system without inert, a single-product ternary system with inert, and a two-product quaternary system. Closed loop results for the different reactive distillation systems demonstrate significant differences in terms of workable control structures and appropriate temperature control tray locations. A suitable two-temperature inferential control structure for the optimum designs of all the systems is found. The result for the ternary system with inert is in contrast to recent reports claiming the need for column internal composition control. The results also suggest that, with a properly designed two-temperature inferential control system, column overdesign for good controllability is not needed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24199898 [article] Inferential Temperature control structures for different types of two-reactant reactive distillation systems [texte imprimé] / Devrim B. Kaymak, Auteur ; Denizhan Yilmaz, Auteur ; Ahmet Z. Gurer, Auteur . - 2011 . - pp. 6777-6793. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 11 (Juin 2011) . - pp. 6777-6793 Mots-clés : Distillation  with  reaction  Temperature  control Résumé : The control performance of three types of two-temperature inferential control structures for the economic optimum designs of two-reactant ideal reactive distillation systems is evaluated. Three commonly encountered reaction chemistries are studied, namely, a single-product ternary system without inert, a single-product ternary system with inert, and a two-product quaternary system. Closed loop results for the different reactive distillation systems demonstrate significant differences in terms of workable control structures and appropriate temperature control tray locations. A suitable two-temperature inferential control structure for the optimum designs of all the systems is found. The result for the ternary system with inert is in contrast to recent reports claiming the need for column internal composition control. The results also suggest that, with a properly designed two-temperature inferential control system, column overdesign for good controllability is not needed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24199898