Performance da primeira e segunda lei da termodinâmica para o processo de desidratação do etanol: configurações convencional e alternativas
This work investigates and compares four distillation configurations for anhydrous ethanol production. There are two conventional systems and two thermally coupled to a lateral rectifier, where the difference between each pair is the inclusion of a third separation column (concentrator). In order to...
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| Autores principales: | , , , , , |
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| Formato: | Artículo |
| Lenguaje: | portugués |
| Publicado: |
2024
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| Materias: | |
| Acceso en línea: | https://dialnet.unirioja.es/servlet/oaiart?codigo=10265481 |
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| Sumario: | This work investigates and compares four distillation configurations for anhydrous ethanol production. There are two conventional systems and two thermally coupled to a lateral rectifier, where the difference between each pair is the inclusion of a third separation column (concentrator). In order to verify which configuration is more efficient and has the lowest energy demand, the first and second laws of thermodynamics were applied to perform the energy and availability balance, respectively. In this way, the quantity and quality of energy used were accounted for, in addition to identifying the sources of irreversibility of the processes. The availability balance profiles (lost work, equivalent work and thermodynamic efficiency) and energy consumption were compared for the four optimized systems with and without thermal integration. The analysis of thermodynamic efficiency according to the 2nd law was performed for the overall process.The results suggest that the conventional configuration with two columns and thermal integration is the most thermodynamically sustainable process for anhydrous ethanol production. The thermally coupled configuration with two columns is the one that presents the lowest energy consumption. The main conclusion of this work is that it is only correct to correlate efficiency of the second law and energy consumption for the overall process when also taking into account the variations of the availability function and temperature of the hot source (boiler) when comparing different separation processes. |
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