Liquid-vapor equilibrium for the Water-Acetone-Butanol-Ethanol quaternary system at Low Pressures
Due to the ocurrence of a non ideal behavior of ethanol, butanol and acetone in aqueous solutions, a method to predict those properties in mixture that depend on the composition, temperature and pressure, especially the activity and the fugacity, is outlined in this work. These properties are very i...
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| Format: | Online |
| Language: | spa |
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Universidad Pedagógica y Tecnológica de Colombia
2018
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| Online Access: | https://revistas.uptc.edu.co/index.php/ciencia_en_desarrollo/article/view/8063 |
| _version_ | 1801706342134579200 |
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| author | Moreno Cascante, Jorge Arturo Cubillos Lobo, Jairo Antonio |
| author_facet | Moreno Cascante, Jorge Arturo Cubillos Lobo, Jairo Antonio |
| author_sort | Moreno Cascante, Jorge Arturo |
| collection | OJS |
| description | Due to the ocurrence of a non ideal behavior of ethanol, butanol and acetone in aqueous solutions, a
method to predict those properties in mixture that depend on the composition, temperature and pressure,
especially the activity and the fugacity, is outlined in this work. These properties are very important for
estimating equilibrium constants, constants of transfer speed and chemical reaction, sizing and design of
process equipment. Currently, biobutanol is considered a substitute for bioethanol as a biofuel, presenting
advantages, such as: higher heat capacity and lower vapor pressure. It is obtained from the fermentation of
Acetone-Butanol-Ethanol (ABE), where its major products are acetone, butanol and ethanol in a molar ratio
of 3: 6: 1, respectively. Therefore, the liquid-vapor equilibrium for the quaternary system water-acetone-
butanol-ethanol was calculated at reduced pressures of 0.1, 0.5 and 1 kPa, with the purpose of evaluating
the behavior of the azeotropes (water-butanol and water-ethanol), which is a key issue in the application
of a separation process. The Non Random Two Liquid model (NRTL) was used to calculate the activity
coefficient of the components in the liquid phase, the virial equations to calculate the fugacity coefficient
of the components in the vapor phase and the Rachford and Rice algorithm for the dew temperature. In this
way, it could be demonstrated that at low pressures the azeotrope formed between water and butanol slighly
disappears while the pressure is going down. Therfore, it is recommended by using a pressure of 0.1 kPa
for vacuum distillation, while 0.5 kPa for pervaportation. These values
depend on the separation system
stability (membranes in case of pervaporation) and the process economical balance. |
| format | Online |
| id | oai:oai.revistas.uptc.edu.co:article-8063 |
| institution | Revista Ciencia en Desarrollo |
| language | spa |
| publishDate | 2018 |
| publisher | Universidad Pedagógica y Tecnológica de Colombia |
| record_format | ojs |
| spelling | oai:oai.revistas.uptc.edu.co:article-80632022-06-15T17:02:04Z Liquid-vapor equilibrium for the Water-Acetone-Butanol-Ethanol quaternary system at Low Pressures Equilibrio líquido-vapor para el sistema cuaternario Agua-Acetona-Butanol-Etanol a Presiones Reducidas. Moreno Cascante, Jorge Arturo Cubillos Lobo, Jairo Antonio Butanol actividad fugacidad azeótropo sistema cuaternario. Butanol Activity fugacity, azeotrope, quaternary system Due to the ocurrence of a non ideal behavior of ethanol, butanol and acetone in aqueous solutions, a method to predict those properties in mixture that depend on the composition, temperature and pressure, especially the activity and the fugacity, is outlined in this work. These properties are very important for estimating equilibrium constants, constants of transfer speed and chemical reaction, sizing and design of process equipment. Currently, biobutanol is considered a substitute for bioethanol as a biofuel, presenting advantages, such as: higher heat capacity and lower vapor pressure. It is obtained from the fermentation of Acetone-Butanol-Ethanol (ABE), where its major products are acetone, butanol and ethanol in a molar ratio of 3: 6: 1, respectively. Therefore, the liquid-vapor equilibrium for the quaternary system water-acetone- butanol-ethanol was calculated at reduced pressures of 0.1, 0.5 and 1 kPa, with the purpose of evaluating the behavior of the azeotropes (water-butanol and water-ethanol), which is a key issue in the application of a separation process. The Non Random Two Liquid model (NRTL) was used to calculate the activity coefficient of the components in the liquid phase, the virial equations to calculate the fugacity coefficient of the components in the vapor phase and the Rachford and Rice algorithm for the dew temperature. In this way, it could be demonstrated that at low pressures the azeotrope formed between water and butanol slighly disappears while the pressure is going down. Therfore, it is recommended by using a pressure of 0.1 kPa for vacuum distillation, while 0.5 kPa for pervaportation. These values depend on the separation system stability (membranes in case of pervaporation) and the process economical balance. Debido a la existencia de un comportamiento o interacción no ideal del etanol, butanol y acetona en soluciones acuosas, se presenta en este trabajo un método para predecir aquellas propiedades en mezcla que dependen de la composición, temperatura y presión, especialmente la actividad y la fugacidad. Estas propiedades son importantes para estimar constantes de equilibrio, constantes de velocidad de transferencia y reacción química, dimensionamiento y diseño de equipos de proceso. Actualmente, el biobutanol se considera un sustituto del bioetanol como biocombustible al presentar ventajas como mayor capacidadcalorífica y menor presión de vapor. Su obtención se realiza a partir de la fermentación Acetona-Butanol-Etanol (ABE), donde sus productos mayoritarios son acetona, butanol y etanol en una relación molar 3:6:1, respectivamente. Por ello, se calculó el equilibrio líquido-vapor para el sistema cuaternario agua-acetona- butanol-etanol a presiones reducidas de 0.1, 0.5 y 1 kPa, con el propósito de evaluar el comportamiento de los azeótropos (agua-butanol y agua-etanol), los cuales como bien se conocen límitan la aplicación de unproceso de separación. Se utilizó el modelo Non Random Two Liquid (NRTL) para calcular el coeficiente de actividad de los componentes en fase líquida, las ecuaciones del virial para calcular el coeficiente defugacidad de los componentes en fase de vapor y el algoritmo Rachford y Rice para el punto de roció. De esta manera, se pudo demostrar que a presiones bajas el azeótropo que se forma entre agua y butanol desaparece paulatinamente mientras se reduce la presión. Por tanto, se recomienda utilizar una presión de 0.1 kPa para la destilación al vacío y 0,5 kPa para la pervaporacion. Estos valores están condicionados a la estabilidad del medio de separación (membrana en el caso de la pervaporación) y a la evaluación económica del proceso. Universidad Pedagógica y Tecnológica de Colombia 2018-12-27 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://revistas.uptc.edu.co/index.php/ciencia_en_desarrollo/article/view/8063 10.19053/01217488.v10.n1.2019.8063 Ciencia En Desarrollo; Vol. 10 No. 1 (2019): Vol 10, Núm. 1 (2019): Enero - Junio; 103-116 Ciencia en Desarrollo; Vol. 10 Núm. 1 (2019): Vol 10, Núm. 1 (2019): Enero - Junio; 103-116 2462-7658 0121-7488 spa https://revistas.uptc.edu.co/index.php/ciencia_en_desarrollo/article/view/8063/8301 |
| spellingShingle | Butanol actividad fugacidad azeótropo sistema cuaternario. Butanol Activity fugacity, azeotrope, quaternary system Moreno Cascante, Jorge Arturo Cubillos Lobo, Jairo Antonio Liquid-vapor equilibrium for the Water-Acetone-Butanol-Ethanol quaternary system at Low Pressures |
| title | Liquid-vapor equilibrium for the Water-Acetone-Butanol-Ethanol quaternary system at Low Pressures |
| title_alt | Equilibrio líquido-vapor para el sistema cuaternario Agua-Acetona-Butanol-Etanol a Presiones Reducidas. |
| title_full | Liquid-vapor equilibrium for the Water-Acetone-Butanol-Ethanol quaternary system at Low Pressures |
| title_fullStr | Liquid-vapor equilibrium for the Water-Acetone-Butanol-Ethanol quaternary system at Low Pressures |
| title_full_unstemmed | Liquid-vapor equilibrium for the Water-Acetone-Butanol-Ethanol quaternary system at Low Pressures |
| title_short | Liquid-vapor equilibrium for the Water-Acetone-Butanol-Ethanol quaternary system at Low Pressures |
| title_sort | liquid vapor equilibrium for the water acetone butanol ethanol quaternary system at low pressures |
| topic | Butanol actividad fugacidad azeótropo sistema cuaternario. Butanol Activity fugacity, azeotrope, quaternary system |
| topic_facet | Butanol actividad fugacidad azeótropo sistema cuaternario. Butanol Activity fugacity, azeotrope, quaternary system |
| url | https://revistas.uptc.edu.co/index.php/ciencia_en_desarrollo/article/view/8063 |
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