Documents disponibles écrits par cet auteur

Mass transfer rates from oscillating bubbles in bubble columns operating with viscous fluids / Mariano Martin in Industrial & engineering chemistry research, Vol. 47 N° 23 (Décembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9527–9536 Titre : Mass transfer rates from oscillating bubbles in bubble columns operating with viscous fluids Type de document : texte imprimé Auteurs : Mariano Martin, Auteur ; Francisco J. Montes, Auteur ; Miguel A. Galán, Auteur Année de publication : 2009 Article en page(s) : p. 9527–9536 Note générale : Chemistry engineering Langues : Anglais (eng) Mots-clés : Transfer  rates  Bubble  columns  Viscous  fluids Résumé : In spite of the work on bubble columns, their design and scale-up is still a difficult task due to the lack of understanding of bubble dispersions and mass transfer mechanisms. Even less known are viscous or non-Newtonian fluids. Therefore, a theoretical model for predicting the volumetric mass transfer coefficient, kLa, in bubble columns operating with viscous fluids has been proposed. The model consists of a population balance coupled with a theoretical equation for the Sherwood number for oscillating bubbles, considering the effect of liquid viscosity on both. Experimental results for Newtonian and non-Newtonian viscous liquids from the literature are used to validate the model. Bubble dispersions have been simulated with good agreement using the Weber critical number, Wec, as a parameter to account for the effect of liquid viscosity, which increases bubble stability. A correlation between the liquid viscosity and Wec has also been proposed. The mass transfer resistance is calculated taking into account the hydrodynamic processes involving bubbles (collisions, breakup, coalescence, detachment) because they provide initial oscillation amplitudes. However, bubble oscillation decays in viscous liquids because the oscillating energy is absorbed as viscous dissipation. Good agreement is found between the experimental and the predicted kLa when considering that bubble oscillations do not decay completely by viscous dissipation due to the continuous bubble collisions, breakup, and coalescence. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801077s [article] Mass transfer rates from oscillating bubbles in bubble columns operating with viscous fluids [texte imprimé] / Mariano Martin, Auteur ; Francisco J. Montes, Auteur ; Miguel A. Galán, Auteur . - 2009 . - p. 9527–9536. Chemistry engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9527–9536 Mots-clés : Transfer  rates  Bubble  columns  Viscous  fluids Résumé : In spite of the work on bubble columns, their design and scale-up is still a difficult task due to the lack of understanding of bubble dispersions and mass transfer mechanisms. Even less known are viscous or non-Newtonian fluids. Therefore, a theoretical model for predicting the volumetric mass transfer coefficient, kLa, in bubble columns operating with viscous fluids has been proposed. The model consists of a population balance coupled with a theoretical equation for the Sherwood number for oscillating bubbles, considering the effect of liquid viscosity on both. Experimental results for Newtonian and non-Newtonian viscous liquids from the literature are used to validate the model. Bubble dispersions have been simulated with good agreement using the Weber critical number, Wec, as a parameter to account for the effect of liquid viscosity, which increases bubble stability. A correlation between the liquid viscosity and Wec has also been proposed. The mass transfer resistance is calculated taking into account the hydrodynamic processes involving bubbles (collisions, breakup, coalescence, detachment) because they provide initial oscillation amplitudes. However, bubble oscillation decays in viscous liquids because the oscillating energy is absorbed as viscous dissipation. Good agreement is found between the experimental and the predicted kLa when considering that bubble oscillations do not decay completely by viscous dissipation due to the continuous bubble collisions, breakup, and coalescence. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801077s

Optimization of energy and water consumption in corn-based ethanol plants / Elvis Ahmetovic in Industrial & engineering chemistry research, Vol. 49 N° 17 (Septembre 1, 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 17 (Septembre 1, 2010) . - pp 7972–7982 Titre : Optimization of energy and water consumption in corn-based ethanol plants Type de document : texte imprimé Auteurs : Elvis Ahmetovic, Auteur ; Mariano Martin, Auteur ; Ignacio E. Grossmann, Auteur Année de publication : 2010 Article en page(s) : pp 7972–7982 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Optimization  Energy  Corn  based  ethanol. Résumé : In this paper we study the simultaneous energy and water consumption in the conceptual design of corn-based ethanol plants. A major goal is to reduce the freshwater consumption and wastewater discharge. We consider the corn-based ethanol plant reported in Karuppiah, et al. AICHE J. 2008, 54, 1499−1525. We review the major alternatives in the optimization of energy consumption and its impact in water consumption. Next, for each of the alternatives we synthesize an integrated process water network. This requires closing the loops for process and cooling water and steam, and implementing the proper treatment for the water streams. We show that minimizing energy consumption leads to process water networks with minimum water consumption. As a result, freshwater use is reduced to 1.54 galwater/galethanol, revealing that it is potentially possible to achieve levels of freshwater consumption that are significantly lower than the ones in current industrial operation and that wastewater discharged can also be reduced. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1000955 [article] Optimization of energy and water consumption in corn-based ethanol plants [texte imprimé] / Elvis Ahmetovic, Auteur ; Mariano Martin, Auteur ; Ignacio E. Grossmann, Auteur . - 2010 . - pp 7972–7982. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 17 (Septembre 1, 2010) . - pp 7972–7982 Mots-clés : Optimization  Energy  Corn  based  ethanol. Résumé : In this paper we study the simultaneous energy and water consumption in the conceptual design of corn-based ethanol plants. A major goal is to reduce the freshwater consumption and wastewater discharge. We consider the corn-based ethanol plant reported in Karuppiah, et al. AICHE J. 2008, 54, 1499−1525. We review the major alternatives in the optimization of energy consumption and its impact in water consumption. Next, for each of the alternatives we synthesize an integrated process water network. This requires closing the loops for process and cooling water and steam, and implementing the proper treatment for the water streams. We show that minimizing energy consumption leads to process water networks with minimum water consumption. As a result, freshwater use is reduced to 1.54 galwater/galethanol, revealing that it is potentially possible to achieve levels of freshwater consumption that are significantly lower than the ones in current industrial operation and that wastewater discharged can also be reduced. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1000955

Optimization of water consumption in second generation bioethanol plants / Mariano Martin in Industrial & engineering chemistry research, Vol. 50 N° 7 (Avril 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 7 (Avril 2011) . - pp. 3705–3721 Titre : Optimization of water consumption in second generation bioethanol plants Type de document : texte imprimé Auteurs : Mariano Martin, Auteur ; Elvis Ahmetovic, Auteur ; Ignacio E. Grossmann, Auteur Année de publication : 2011 Article en page(s) : pp. 3705–3721 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Optimization  Water  Bioethanol Résumé : In this work we address the water consumption optimization of second generation bioethanol production plants from lignocellulosic switchgrass when using thermo-chemical, thermo-biochemical, or biochemical routes considering corn-based ethanol as a reference. To optimize the water consumption a three stage method is used. First, energy consumption is optimized in the production processes, which reduces the cooling needs of the processes and thus, the water losses by evaporation and drift in the cooling tower. Next, a number of technologies are considered to partially substitute the use of water as cooling agent. Finally, the optimal water networks for each of the ethanol production processes are designed by determining water consumption, reuse, and recycle and the required treatment using a superstructure optimization approach. The resulting water consumption ratios range from 1.5 to 3 gal/gal, which are in the range or even below the amount of water needed for gasoline production and with low or no water discharge depending on the process. Further reduction can be obtained by using air cooling and if the water released from the crop can be properly recovered and treated. Under these conditions the water consumption ratios range from 0.4 to 1.7 gal/gal and with no or low water discharge. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101175p [article] Optimization of water consumption in second generation bioethanol plants [texte imprimé] / Mariano Martin, Auteur ; Elvis Ahmetovic, Auteur ; Ignacio E. Grossmann, Auteur . - 2011 . - pp. 3705–3721. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 7 (Avril 2011) . - pp. 3705–3721 Mots-clés : Optimization  Water  Bioethanol Résumé : In this work we address the water consumption optimization of second generation bioethanol production plants from lignocellulosic switchgrass when using thermo-chemical, thermo-biochemical, or biochemical routes considering corn-based ethanol as a reference. To optimize the water consumption a three stage method is used. First, energy consumption is optimized in the production processes, which reduces the cooling needs of the processes and thus, the water losses by evaporation and drift in the cooling tower. Next, a number of technologies are considered to partially substitute the use of water as cooling agent. Finally, the optimal water networks for each of the ethanol production processes are designed by determining water consumption, reuse, and recycle and the required treatment using a superstructure optimization approach. The resulting water consumption ratios range from 1.5 to 3 gal/gal, which are in the range or even below the amount of water needed for gasoline production and with low or no water discharge depending on the process. Further reduction can be obtained by using air cooling and if the water released from the crop can be properly recovered and treated. Under these conditions the water consumption ratios range from 0.4 to 1.7 gal/gal and with no or low water discharge. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101175p

Process optimization of FT - diesel production from lignocellulosic switchgrass / Mariano Martin in Industrial & engineering chemistry research, Vol. 50 N° 23 (Décembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 23 (Décembre 2011) . - pp. 13485–13499 Titre : Process optimization of FT - diesel production from lignocellulosic switchgrass Type de document : texte imprimé Auteurs : Mariano Martin, Auteur ; Ignacio E. Grossmann, Auteur Année de publication : 2012 Article en page(s) : pp. 13485–13499 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Optimization  Lignocellulosic Résumé : In this paper, we present the conceptual design for the optimization of FT-diesel production process from switchgrass via gasification of biomass. We propose a limited superstructure where the process starts with the gasification of the biomass. Two different alternatives are evaluated, direct and indirect gasification. The gas obtained is cleaned up and its composition adjusted in terms of the ratio CO/H2 considering a bypass, a PSA system and water gas shift reaction. Next, the removal of CO2 and H2S is performed using absorption in monoethanolamines and PSA. Once the syngas is prepared, the Fischer-Tropsch reaction is conducted and the products separated. Hydrocracking of the heavy products is also considered to increase the yield toward green diesel. The optimization of the system is formulated as an equation-based Mixed-Integer Nonlinear Programming (MINLP) problem that is solved for the optimal production of the biodiesel fraction while minimizing the energy consumption and the hydrogen consumption. The optimal solution requires the use of indirect gasification followed by steam reforming. The ratio of CO/H2 is left unchanged as the one obtained after gas reforming, while adjusting the temperature at the FT reactor and the operating conditions of the hydrocracking to increase the FT-diesel production. A promising production cost of 0.71 $/gallon is obtained, and only 0.15 gal Water/gal bioifuel of water consumption is required if air cooling is implemented in the plant. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201261t [article] Process optimization of FT - diesel production from lignocellulosic switchgrass [texte imprimé] / Mariano Martin, Auteur ; Ignacio E. Grossmann, Auteur . - 2012 . - pp. 13485–13499. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 23 (Décembre 2011) . - pp. 13485–13499 Mots-clés : Optimization  Lignocellulosic Résumé : In this paper, we present the conceptual design for the optimization of FT-diesel production process from switchgrass via gasification of biomass. We propose a limited superstructure where the process starts with the gasification of the biomass. Two different alternatives are evaluated, direct and indirect gasification. The gas obtained is cleaned up and its composition adjusted in terms of the ratio CO/H2 considering a bypass, a PSA system and water gas shift reaction. Next, the removal of CO2 and H2S is performed using absorption in monoethanolamines and PSA. Once the syngas is prepared, the Fischer-Tropsch reaction is conducted and the products separated. Hydrocracking of the heavy products is also considered to increase the yield toward green diesel. The optimization of the system is formulated as an equation-based Mixed-Integer Nonlinear Programming (MINLP) problem that is solved for the optimal production of the biodiesel fraction while minimizing the energy consumption and the hydrogen consumption. The optimal solution requires the use of indirect gasification followed by steam reforming. The ratio of CO/H2 is left unchanged as the one obtained after gas reforming, while adjusting the temperature at the FT reactor and the operating conditions of the hydrocracking to increase the FT-diesel production. A promising production cost of 0.71 $/gallon is obtained, and only 0.15 gal Water/gal bioifuel of water consumption is required if air cooling is implemented in the plant. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201261t

Simultaneous optimization and heat integration for biodiesel production from cooking oil and algae / Mariano Martin in Industrial & engineering chemistry research, Vol. 51 N° 23 (Juin 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 23 (Juin 2012) . - pp. 7998–8014 Titre : Simultaneous optimization and heat integration for biodiesel production from cooking oil and algae Type de document : texte imprimé Auteurs : Mariano Martin, Auteur ; Ignacio E. Grossmann, Auteur Année de publication : 2012 Article en page(s) : pp. 7998–8014 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Optimization  Biodiesel Résumé : In this article, we address the optimal production of second-generation biodiesel using waste cooking oil and algae oil. We consider five different technologies for the transesterification of the oil (homogeneous acid- or alkali-catalyzed, heterogeneous basic-catalyzed, enzymatic, and supercritical uncatalyzed). We formulate the problem as an MINLP problem where the models for each of the reactors are based on surface response methodology to capture the effects of the variables on the yield. The aim is to perform simultaneous optimization and heat integration for the production of biodiesel from each of the different oil sources in terms of the technology to use and the operating conditions to apply. Furthermore, a process network is designed to minimize the freshwater consumption. The optimal conditions in the reactors differ from those traditionally used because the separation tasks are taken into account in this work. For algae oil, the optimal process employs alkali as the catalyst and has a production cost of 0.42$/gal, an energy consumption of 1.94 MJ/gal, and a freshwater consumption of 0.60 galwater/galethanol. For cooking oil, the optimal process is the one with the heterogeneous catalyst and has a production cost and energy and water consumption of $0.66/gal, 1.94 MJ/gal, and 0.33 galwater/galethanol, respectively. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2024596 [article] Simultaneous optimization and heat integration for biodiesel production from cooking oil and algae [texte imprimé] / Mariano Martin, Auteur ; Ignacio E. Grossmann, Auteur . - 2012 . - pp. 7998–8014. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 23 (Juin 2012) . - pp. 7998–8014 Mots-clés : Optimization  Biodiesel Résumé : In this article, we address the optimal production of second-generation biodiesel using waste cooking oil and algae oil. We consider five different technologies for the transesterification of the oil (homogeneous acid- or alkali-catalyzed, heterogeneous basic-catalyzed, enzymatic, and supercritical uncatalyzed). We formulate the problem as an MINLP problem where the models for each of the reactors are based on surface response methodology to capture the effects of the variables on the yield. The aim is to perform simultaneous optimization and heat integration for the production of biodiesel from each of the different oil sources in terms of the technology to use and the operating conditions to apply. Furthermore, a process network is designed to minimize the freshwater consumption. The optimal conditions in the reactors differ from those traditionally used because the separation tasks are taken into account in this work. For algae oil, the optimal process employs alkali as the catalyst and has a production cost of 0.42$/gal, an energy consumption of 1.94 MJ/gal, and a freshwater consumption of 0.60 galwater/galethanol. For cooking oil, the optimal process is the one with the heterogeneous catalyst and has a production cost and energy and water consumption of $0.66/gal, 1.94 MJ/gal, and 0.33 galwater/galethanol, respectively. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2024596