Documents disponibles écrits par cet auteur

Dehydration of bioethanol by hybrid process liquid – liquid extraction/extractive distillation / Adriana Avilés Martinez in Industrial & engineering chemistry research, Vol. 51 N° 17 (Mai 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 17 (Mai 2012) . - pp. 5847–5855 Titre : Dehydration of bioethanol by hybrid process liquid – liquid extraction/extractive distillation Type de document : texte imprimé Auteurs : Adriana Avilés Martinez, Auteur ; Jaime Saucedo-Luna, Auteur ; Juan Gabriel Segovia-Hernandez, Auteur Année de publication : 2012 Article en page(s) : pp. 5847–5855 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Bioethanol  Biofuels  Distillation Résumé : Bioethanol is among the most promising of biofuels because it has an energy content similar to gasoline while generating lower pollutant emissions than gasoline. But, in order to be used as an automotive fuel mixed with gasoline, ethanol must have less than 0.5 wt % of water. To achieve required ethanol purity, in light of the fact that the ethanol–water mixture forms an azeotrope, unconventional separation techniques such as extractive distillation or azeotropic distillation are necessary. However, the purification of ethanol using conventional distillation followed by extractive distillation has the disadvantage of high cost of services. Thus, this study proposes alternative hybrid systems using liquid–liquid extraction and extractive distillation. The use of n-dodecane as entrainer for liquid–liquid extraction and glycerol as entrainer for extractive distillation has been considered. The proposed systems are analyzed and a comparison is done on their performance in terms of energy and total annual cost. It has been found that the hybrid scheme presents both lower total energy consumption and lower total annual cost as compared to the traditional purification scheme with conventional distillation and extractive distillation. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200932g [article] Dehydration of bioethanol by hybrid process liquid – liquid extraction/extractive distillation [texte imprimé] / Adriana Avilés Martinez, Auteur ; Jaime Saucedo-Luna, Auteur ; Juan Gabriel Segovia-Hernandez, Auteur . - 2012 . - pp. 5847–5855. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 17 (Mai 2012) . - pp. 5847–5855 Mots-clés : Bioethanol  Biofuels  Distillation Résumé : Bioethanol is among the most promising of biofuels because it has an energy content similar to gasoline while generating lower pollutant emissions than gasoline. But, in order to be used as an automotive fuel mixed with gasoline, ethanol must have less than 0.5 wt % of water. To achieve required ethanol purity, in light of the fact that the ethanol–water mixture forms an azeotrope, unconventional separation techniques such as extractive distillation or azeotropic distillation are necessary. However, the purification of ethanol using conventional distillation followed by extractive distillation has the disadvantage of high cost of services. Thus, this study proposes alternative hybrid systems using liquid–liquid extraction and extractive distillation. The use of n-dodecane as entrainer for liquid–liquid extraction and glycerol as entrainer for extractive distillation has been considered. The proposed systems are analyzed and a comparison is done on their performance in terms of energy and total annual cost. It has been found that the hybrid scheme presents both lower total energy consumption and lower total annual cost as compared to the traditional purification scheme with conventional distillation and extractive distillation. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200932g

Extractive dividing wall column / Christian Bravo-Jonard 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. 3672–3688 Titre : Extractive dividing wall column : design and optimization Type de document : texte imprimé Auteurs : Christian Bravo-Jonard, Auteur ; Juan Gabriel Segovia-Hernandez, Auteur ; Claudia Gutiérrez-Antonio, Auteur Année de publication : 2010 Article en page(s) : pp. 3672–3688 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : extractive  wall  multiobjective  genetic  algorithms  extractive  distillation  process. Résumé : This paper proposes a novel extractive dividing wall distillation column, which has been designed using a constrained stochastic multiobjective optimization technique. The approach is based on the use of genetic algorithms to determine the design that minimizes energy consumption and total annualized cost. Several case studies are used to show the feasibility of performing extractive separations in dividing wall distillation columns. The simulation results show the effect of the main variables on the complex extractive distillation process. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9006936 [article] Extractive dividing wall column : design and optimization [texte imprimé] / Christian Bravo-Jonard, Auteur ; Juan Gabriel Segovia-Hernandez, Auteur ; Claudia Gutiérrez-Antonio, Auteur . - 2010 . - pp. 3672–3688. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 8 (Avril 2010) . - pp. 3672–3688 Mots-clés : extractive  wall  multiobjective  genetic  algorithms  extractive  distillation  process. Résumé : This paper proposes a novel extractive dividing wall distillation column, which has been designed using a constrained stochastic multiobjective optimization technique. The approach is based on the use of genetic algorithms to determine the design that minimizes energy consumption and total annualized cost. Several case studies are used to show the feasibility of performing extractive separations in dividing wall distillation columns. The simulation results show the effect of the main variables on the complex extractive distillation process. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9006936

Optimization and controllability analysis of thermally coupled reactive distillation arrangements with minimum use of reboilers / Maria Vazquez-Ojeda in Industrial & engineering chemistry research, Vol. 51 N° 17 (Mai 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 17 (Mai 2012) . - pp. 5856–5865 Titre : Optimization and controllability analysis of thermally coupled reactive distillation arrangements with minimum use of reboilers Type de document : texte imprimé Auteurs : Maria Vazquez-Ojeda, Auteur ; Juan Gabriel Segovia-Hernandez, Auteur ; Salvador Hernandez, Auteur Année de publication : 2012 Article en page(s) : pp. 5856–5865 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Optimization  Distillation  systems Résumé : The optimal design of reactive complex distillation systems is a highly nonlinear and multivariable problem, and the objective function used as optimization criterion is generally nonconvex with several local optimums and subject to several constraints. The esterification of lauric acid and methanol is explored using thermally coupled distillation sequences with side columns and with a minimum number of reboilers. The product of the esterification can be used as biodiesel. This is a major step forward since thermally coupled reactive distillation sequences with side columns and with a minimum number of reboilers offer significant benefits, such as the following: reductions on both capital investment and operating costs due to the absence of the reboilers and higher conversion and selectivity since products are removed as they are produced as well as no occurrence of thermal degradation of the products due to a lower temperature profile in the column. In this work, we have studied the design of reactive distillation with thermal coupling with a minimum number of reboilers, using differential evolution with restrictions coupled to AspenONE Aspen Plus. Also, we have analyzed the control properties of the reactive distillation schemes studied, and the results indicate that the energy requirements and the total annual cost of the complex distillation sequences with a minimum number of reboilers are reduced significantly in comparison with the conventional reactive distillation process and can be also achieved without significant control problems. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200929t [article] Optimization and controllability analysis of thermally coupled reactive distillation arrangements with minimum use of reboilers [texte imprimé] / Maria Vazquez-Ojeda, Auteur ; Juan Gabriel Segovia-Hernandez, Auteur ; Salvador Hernandez, Auteur . - 2012 . - pp. 5856–5865. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 17 (Mai 2012) . - pp. 5856–5865 Mots-clés : Optimization  Distillation  systems Résumé : The optimal design of reactive complex distillation systems is a highly nonlinear and multivariable problem, and the objective function used as optimization criterion is generally nonconvex with several local optimums and subject to several constraints. The esterification of lauric acid and methanol is explored using thermally coupled distillation sequences with side columns and with a minimum number of reboilers. The product of the esterification can be used as biodiesel. This is a major step forward since thermally coupled reactive distillation sequences with side columns and with a minimum number of reboilers offer significant benefits, such as the following: reductions on both capital investment and operating costs due to the absence of the reboilers and higher conversion and selectivity since products are removed as they are produced as well as no occurrence of thermal degradation of the products due to a lower temperature profile in the column. In this work, we have studied the design of reactive distillation with thermal coupling with a minimum number of reboilers, using differential evolution with restrictions coupled to AspenONE Aspen Plus. Also, we have analyzed the control properties of the reactive distillation schemes studied, and the results indicate that the energy requirements and the total annual cost of the complex distillation sequences with a minimum number of reboilers are reduced significantly in comparison with the conventional reactive distillation process and can be also achieved without significant control problems. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200929t

Short-cut method for the design of reactive distillation columns / Marcelino Carrera-Rodriguez in Industrial & engineering chemistry research, Vol. 50 N° 18 (Septembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 18 (Septembre 2011) . - pp. 10730–10743 Titre : Short-cut method for the design of reactive distillation columns Type de document : texte imprimé Auteurs : Marcelino Carrera-Rodriguez, Auteur ; Juan Gabriel Segovia-Hernandez, Auteur ; Adrian Bonilla-Petriciolet, Auteur Année de publication : 2011 Article en page(s) : pp. 10730–10743 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Distillation  column  Distillation  with  reaction  Design Résumé : The design of reactive distillation (RD) has received significant attention because of the technological and economic advantages obtained from the simultaneous occurrence of reaction and separation. Although the advantages of RD are well-documented in the literature, the commercial applications of RD are still limited because of the control and operation complexity of these separation systems and the need for improved software tools to reliably model and design RD columns. In this study, a robust short-cut method for the design of multicomponent reactive distillation is presented. This method is based on distillation lines and tray-by-tray calculations defined in terms of reaction-invariant composition variables. Our method provides the number of theoretical stages, the operating reflux ratio, the feed tray location, and the top or bottom flow. We use three case studies to demonstrate the effectiveness of the proposed strategy, namely, the reactive systems for the syntheses of ETBE and MTBE in the presence of inert components and of TAME without inert components. The results obtained with our strategy show good agreement with those obtained using the rigorous model of the commercial simulator AspenONE Aspen Plus. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24523890 [article] Short-cut method for the design of reactive distillation columns [texte imprimé] / Marcelino Carrera-Rodriguez, Auteur ; Juan Gabriel Segovia-Hernandez, Auteur ; Adrian Bonilla-Petriciolet, Auteur . - 2011 . - pp. 10730–10743. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 18 (Septembre 2011) . - pp. 10730–10743 Mots-clés : Distillation  column  Distillation  with  reaction  Design Résumé : The design of reactive distillation (RD) has received significant attention because of the technological and economic advantages obtained from the simultaneous occurrence of reaction and separation. Although the advantages of RD are well-documented in the literature, the commercial applications of RD are still limited because of the control and operation complexity of these separation systems and the need for improved software tools to reliably model and design RD columns. In this study, a robust short-cut method for the design of multicomponent reactive distillation is presented. This method is based on distillation lines and tray-by-tray calculations defined in terms of reaction-invariant composition variables. Our method provides the number of theoretical stages, the operating reflux ratio, the feed tray location, and the top or bottom flow. We use three case studies to demonstrate the effectiveness of the proposed strategy, namely, the reactive systems for the syntheses of ETBE and MTBE in the presence of inert components and of TAME without inert components. The results obtained with our strategy show good agreement with those obtained using the rigorous model of the commercial simulator AspenONE Aspen Plus. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24523890

Simplified methodology for the design and optimization of thermally coupled reactive distillation systems / Fernando Israel Gómez-Castro in Industrial & engineering chemistry research, Vol. 51 N° 36 (Septembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 36 (Septembre 2012) . - pp. 11717-11730 Titre : Simplified methodology for the design and optimization of thermally coupled reactive distillation systems Type de document : texte imprimé Auteurs : Fernando Israel Gómez-Castro, Auteur ; Rico-Ramirez, Vicente, Auteur ; Juan Gabriel Segovia-Hernandez, Auteur Année de publication : 2012 Article en page(s) : pp. 11717-11730 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Distillation  with  reaction  Optimization  Design Résumé : New intensified schemes have been recently proposed as an attempt to reduce energy requirements and equipment costs in reaction-separation processes. A design methodology for thermally coupled reactive distillation systems is proposed in this work. To design the columns, a method based on the Fenske―Underwood―Gilliland (FUG) equations is proposed and tested. The FUG equations, the mass and energy balances, and the phase equilibrium equations are used to formulate the model of the intensified systems. Such a model is then solved as a nonlinear programming problem; the objective function is the minimization of the heat duty in the column. Biodiesel production through the esterification of oleic acid with supercritical methanol is used as a case study. Results show the feasibility of obtaining designs with low energy requirements by using the proposed methodology. Because of nonconvexities present in the formulation, the estimated interlinking flows for the reactive Petlyuk column might not correspond to a minimum for energy requirements. Nevertheless, the resulting designs not only show low heat duties, with a difference of less than 2% from that minimum, but also have the capacity of achieving the desired conversion and purities. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26350340 [article] Simplified methodology for the design and optimization of thermally coupled reactive distillation systems [texte imprimé] / Fernando Israel Gómez-Castro, Auteur ; Rico-Ramirez, Vicente, Auteur ; Juan Gabriel Segovia-Hernandez, Auteur . - 2012 . - pp. 11717-11730. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 36 (Septembre 2012) . - pp. 11717-11730 Mots-clés : Distillation  with  reaction  Optimization  Design Résumé : New intensified schemes have been recently proposed as an attempt to reduce energy requirements and equipment costs in reaction-separation processes. A design methodology for thermally coupled reactive distillation systems is proposed in this work. To design the columns, a method based on the Fenske―Underwood―Gilliland (FUG) equations is proposed and tested. The FUG equations, the mass and energy balances, and the phase equilibrium equations are used to formulate the model of the intensified systems. Such a model is then solved as a nonlinear programming problem; the objective function is the minimization of the heat duty in the column. Biodiesel production through the esterification of oleic acid with supercritical methanol is used as a case study. Results show the feasibility of obtaining designs with low energy requirements by using the proposed methodology. Because of nonconvexities present in the formulation, the estimated interlinking flows for the reactive Petlyuk column might not correspond to a minimum for energy requirements. Nevertheless, the resulting designs not only show low heat duties, with a difference of less than 2% from that minimum, but also have the capacity of achieving the desired conversion and purities. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26350340