The concept of diabatic distillation is applied to an extractive distillation system of ethanol, ... more The concept of diabatic distillation is applied to an extractive distillation system of ethanol, which uses glycerol as entrainer, to study the influence of heat flows in optimal design, operation, and thermodynamic efficiency of such systems via exergy analysis. First, optimal operating conditions for minimum exergy losses are computed for a diabatic column with fixed feed locations and number of trays. Then, optimal design (feed locations, number of trays, and heat flows along the column) and operation of the system is calculated as a mixed integer nonlinear programming (MINLP) problem, for an economic and economic-exergetic objective functions for two different entrainer molar flows. It was found that the entrainer molar flow has remarkable influence in the reduction of the exergy losses of the system.
Conference code: 96214, Export Date: 15 October 2013, Source: Scopus, Language of Original Docume... more Conference code: 96214, Export Date: 15 October 2013, Source: Scopus, Language of Original Document: English, Correspondence Address: Cadena, J.E.; Universidad de Los Andes, Bogotá, Colombia, References: Jung, S., A new approach for facility siting using mapping risks on a plant grid area and optimization (2010) Journal of Loss Prevention in the Process Industries, 23 (6), pp. 824-830;
Conference code: 99285, Export Date: 15 October 2013, Source: Scopus, Language of Original Docume... more Conference code: 99285, Export Date: 15 October 2013, Source: Scopus, Language of Original Document: English, Correspondence Address: Chemical Engineering Department, Universidad de Los Andes, Cra 1 Este No 19A - 40, Bogotá, Colombia, References: Sklet, S., Safety barriers: Definition, classification, and performance (2006) Journal of Loss Prevention in the Process Industries, 19 (5), pp. 494-506. , DOI 10.1016/j.jlp.2005.12.004, PII S0950423005001968;
Export Date: 15 October 2013, Source: Scopus, Language of Original Document: English, Corresponde... more Export Date: 15 October 2013, Source: Scopus, Language of Original Document: English, Correspondence Address: Nova, A.F.; Department of Chemical Engineering, Universidad de Los Andes, Bogota, Colombia, References: Demirel, Y., (2004) Thermodynamic Analysis of Separation Systems, , Chemical Ans Biomolecular Engineering Research and Publications, (Thermal Mechanics);
Conference code: 94591, Export Date: 15 October 2013, Source: Scopus, Language of Original Docume... more Conference code: 94591, Export Date: 15 October 2013, Source: Scopus, Language of Original Document: English, Correspondence Address: Ramos, M.A.; Grupo de Diseño de Productos y Procesos, Departamento de Ingeniería Química, Universidad de Los Andes, Carrera 1 No. 18a-10, Bogotá, Colombia; email: ma.ramos43@uniandes.edu.co, References: García-Herreros, P., Gómez, J.M., Gil, I.D., Rodriguez, G., Optimization of the design and operation of an extractive distillation system for the production of fuel grade ethanol using glycerol as entrainer (2011) Industrial & Engineering Chemistry Research, 50, pp. 3977-3985;
The extractive distillation of ethanol using glycerol as the entrainer was studied to determine i... more The extractive distillation of ethanol using glycerol as the entrainer was studied to determine its optimal control profiles when the azeotropic feed was subjected to composition disturbances. The process was modeled by a differential-algebraic equation (DAE) system that represents the dynamics of the equilibrium stages in the extraction column. The model equations were solved by discretizing the time domain using orthogonal collocation on finite elements. Initially, the effects of feed disturbances on the product flow rate and quality were analyzed. Subsequently, a profit objective function was formulated, and the optimal profiles of the manipulated variables (reflux ratio and reboiler duty) were determined, subject to quality constraints. The solution was obtained by solving the nonlinear programming (NLP) problem that resulted from the discretization. The problem was solved in GAMS using IPOPT as the nonlinear solver, testing two different linear solvers, the Harwell subroutines MA57 and MA86. The optimal control strategy was compared to a simple PI control scheme.
The implementation of the inherent safety principles could be ambiguous due to the strategies tha... more The implementation of the inherent safety principles could be ambiguous due to the strategies that are involved on. Optimization is one of the options that could be seen as the key to balance the risk reduction and the economic feasibility of the project. The utilization of safety index is another option, with lower time efficiency and related results. The present paper will focus on the implementation of inherent safety principles into the biofuels production. The starting point is related to the chemist modification, passing from the common trans-esterification reaction to a two steps process, a hydrolysis of the triolein and with the fatty acid obtained do an esterification with methanol. The software selected for the project development is Aspen Plus and the reduction on the process risk will be evaluated with process safety indexes. The latter involve the characteristics of the process, type of equipment and the most important thing the type of substance that is handled on each...
The concept of diabatic distillation is applied to an extractive distillation system of ethanol, ... more The concept of diabatic distillation is applied to an extractive distillation system of ethanol, which uses glycerol as entrainer, to study the influence of heat flows in optimal design, operation, and thermodynamic efficiency of such systems via exergy analysis. First, optimal operating conditions for minimum exergy losses are computed for a diabatic column with fixed feed locations and number of trays. Then, optimal design (feed locations, number of trays, and heat flows along the column) and operation of the system is calculated as a mixed integer nonlinear programming (MINLP) problem, for an economic and economic-exergetic objective functions for two different entrainer molar flows. It was found that the entrainer molar flow has remarkable influence in the reduction of the exergy losses of the system.
Conference code: 96214, Export Date: 15 October 2013, Source: Scopus, Language of Original Docume... more Conference code: 96214, Export Date: 15 October 2013, Source: Scopus, Language of Original Document: English, Correspondence Address: Cadena, J.E.; Universidad de Los Andes, Bogotá, Colombia, References: Jung, S., A new approach for facility siting using mapping risks on a plant grid area and optimization (2010) Journal of Loss Prevention in the Process Industries, 23 (6), pp. 824-830;
Conference code: 99285, Export Date: 15 October 2013, Source: Scopus, Language of Original Docume... more Conference code: 99285, Export Date: 15 October 2013, Source: Scopus, Language of Original Document: English, Correspondence Address: Chemical Engineering Department, Universidad de Los Andes, Cra 1 Este No 19A - 40, Bogotá, Colombia, References: Sklet, S., Safety barriers: Definition, classification, and performance (2006) Journal of Loss Prevention in the Process Industries, 19 (5), pp. 494-506. , DOI 10.1016/j.jlp.2005.12.004, PII S0950423005001968;
Export Date: 15 October 2013, Source: Scopus, Language of Original Document: English, Corresponde... more Export Date: 15 October 2013, Source: Scopus, Language of Original Document: English, Correspondence Address: Nova, A.F.; Department of Chemical Engineering, Universidad de Los Andes, Bogota, Colombia, References: Demirel, Y., (2004) Thermodynamic Analysis of Separation Systems, , Chemical Ans Biomolecular Engineering Research and Publications, (Thermal Mechanics);
Conference code: 94591, Export Date: 15 October 2013, Source: Scopus, Language of Original Docume... more Conference code: 94591, Export Date: 15 October 2013, Source: Scopus, Language of Original Document: English, Correspondence Address: Ramos, M.A.; Grupo de Diseño de Productos y Procesos, Departamento de Ingeniería Química, Universidad de Los Andes, Carrera 1 No. 18a-10, Bogotá, Colombia; email: ma.ramos43@uniandes.edu.co, References: García-Herreros, P., Gómez, J.M., Gil, I.D., Rodriguez, G., Optimization of the design and operation of an extractive distillation system for the production of fuel grade ethanol using glycerol as entrainer (2011) Industrial & Engineering Chemistry Research, 50, pp. 3977-3985;
The extractive distillation of ethanol using glycerol as the entrainer was studied to determine i... more The extractive distillation of ethanol using glycerol as the entrainer was studied to determine its optimal control profiles when the azeotropic feed was subjected to composition disturbances. The process was modeled by a differential-algebraic equation (DAE) system that represents the dynamics of the equilibrium stages in the extraction column. The model equations were solved by discretizing the time domain using orthogonal collocation on finite elements. Initially, the effects of feed disturbances on the product flow rate and quality were analyzed. Subsequently, a profit objective function was formulated, and the optimal profiles of the manipulated variables (reflux ratio and reboiler duty) were determined, subject to quality constraints. The solution was obtained by solving the nonlinear programming (NLP) problem that resulted from the discretization. The problem was solved in GAMS using IPOPT as the nonlinear solver, testing two different linear solvers, the Harwell subroutines MA57 and MA86. The optimal control strategy was compared to a simple PI control scheme.
The implementation of the inherent safety principles could be ambiguous due to the strategies tha... more The implementation of the inherent safety principles could be ambiguous due to the strategies that are involved on. Optimization is one of the options that could be seen as the key to balance the risk reduction and the economic feasibility of the project. The utilization of safety index is another option, with lower time efficiency and related results. The present paper will focus on the implementation of inherent safety principles into the biofuels production. The starting point is related to the chemist modification, passing from the common trans-esterification reaction to a two steps process, a hydrolysis of the triolein and with the fatty acid obtained do an esterification with methanol. The software selected for the project development is Aspen Plus and the reduction on the process risk will be evaluated with process safety indexes. The latter involve the characteristics of the process, type of equipment and the most important thing the type of substance that is handled on each...
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