Examinando por Autor "Sánchez-Correa, César Augusto"

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    Algoritmo etapa a etapa para la simulación de cascadas de extracción en fase líquida aplicando el modelo de equilibrio
    (2013-12-17) Sánchez-Correa, César Augusto; Arturo, Jaime E.; Cárdenas, Andrés C.
    It is shown a stage-by-stage solution method for the group of mass balances, equilibrium relationships, sum of compositions and enthalpy equations (MESH equations) that represents the equilibrium model for a countercurrent multistage liquid-liquid extraction arrangement. The theoretical foundation is in thermodynamics: liquid-liquid equilibrium, isothermal flash, and adiabatic flash. The algorithm exceeds the scope of graphics and isothermal methods used in the study of extraction processes, which is applicable to very common typical situations: heat transfer by stage, adiabatic stages, and different temperatures in feed and solvent streams. The algorithm is illustrated in three examples, the first two in isothermal operation with three components (water, acetic acid and butyl acetate) and ten stages, and a third one more elaborated involving heat transfer with four components (water, acetic acid, butanol, butyl acetate) and fifteen stages.
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    Cálculo e interpretación de las trayectorias de puntos de composición constante (pinch) en columnas simples de destilación para mezclas azeotrópicas homogéneas
    (2013-11-14) Sánchez-Correa, César Augusto
    A continuation method of the kind predictor-corrector is presented for completely tracking of the pinch points branches related to the products or pseudoproducts of a homogeneous azeotropic distillation column. The method easily handles the turning points allowing the localization of the tangent pinch points. The foundation of the concept is in the ideas of Fidkowski, Malone y Doherty; however, some novelties are included, as the initiation strategy for calculations, the way to obtain the tangent vector and the set of equations on which the technique is applied. Three examples are illustrated with the solutions of acetone + chloroform + benzene, acetone + chloroform + methanol and acetic acid + amyl alcohol + amyl acetate, emphasizing cases that show better separation possibilities in the finite reflux condition than with total reflux operation.
  • Miniatura
    PublicaciónAcceso abierto
    Herramientas geométricas para el diseño básico de columnas de destilación con mezclas azeotrópicas heterogéneas ternarias. I. Cálculo del reflujo mínimo
    (2013-11-07) Sánchez-Correa, César Augusto; Rodríguez, Gerardo; Gómez-García, Miguel Ángel
    Useful numerical tools to calculate the minimum reflux for infinite towers with heterogeneous azeotropic ternary mixtures are presented. For this, two geometrical elements are involved: the pinch point branches (PPB) and the structure defined by the binodal and the vapor line. The proposed conceptual design methodology integrates those two elements with the distillation borders at total reflux. The solution of the minimum reflux problem (MPR) for two mixtures of industrial interest (the dehydrations of acetic acid using n-amilacetate and ethanol using benzene) demonstrates the usefulness of the proposed methodology. For the analyzed mixtures under sharp separations the structure of the distillation lines at minimum reflux satisfies the regularities observed in homogeneous systems.
  • Miniatura
    PublicaciónAcceso abierto
    Herramientas para la caracterización termodinámica de sistemas ternarios en destilación
    (2013-11-25) Sánchez-Correa, César Augusto; Estupiñán, L. (Libardo); Salazar, M. A. (Mario Andrés)
    Innovative numerical tools are presented in this paper, based on the theory of homotopy continuation methods, for the solution of phase equilibrium problems, pertinent in the thermodynamic characterization of ternary mixtures. The main contribution is the strategy to transform phase equilibrium problems in thermodynamic homotopies that can be solved with the continuation methods. Some complex but typical situations are illustrated in processes of azeotropic and extractive distillation, related to the location of azeotropes, the classification of the volatility regions and the liquid-liquid-vapor envelope.