-The aim of this work is to compare several of the commercial dynamic models for batch distillation available worldwide. In this context, BATCHFRAC™, CHEMCAD™ BATCH, and HYSYS.Plant ® software performances are compared to experimental data. The software can be used as soft sensors, playing the roll of ad-hoc observers or estimators for control objectives. Rigorous models were used as an alternative to predict the concentration profile and to specify the optimal switching time from products to slop cuts. The performance of a nonlinear model obtained using a novel identification algorithm was also studied. In addition, the strategy for continuous separation was revised with residue curve map analysis using Aspen SPLIT™.
ResumenSe plantea una revisión de las acciones desarrolladas en la aplicación de la simulación de procesos y en particular del uso de un simulador comercial de procesos, como apoyo para la enseñanza en carreras de ingeniería de distintas especialidades. Estas experiencias fueron realizadas en la Facultad Regional Villa María de la Universidad Tecnológica Nacional en Argentina. Se analiza la utilización dada al software ChemCAD™ y sus módulos CC-Therm™ y CC-Batch™ durante más de una década en cátedras del ciclo superior de las carreras de ingeniería que imparte la Facultad, en especial en ingeniería química. También se hace referencia a su empleo en la especialidad de ingeniería mecánica y en cursos de posgrado de tecnología de alimentos. Como ejemplo, se describe un trabajo académico que con alumnos del cuarto nivel de ingeniería química. Este ejemplo muestra como se puede integrar el uso de la simulación con experiencias de planta piloto en forma eficiente. Como conclusiones se destaca la relevancia que tiene esta integración de conocimientos para el proceso enseñanza aprendizaje y la formación de mejores ingenieros. Palabras clave: simulación de procesos, enseñanza en ingeniería, simuladores comerciales, ChemCAD Application of the ChemCAD ™ Simulator to the Teaching in Engineering Careers AbstractSeveral activities related to the application of process simulation and in particular to the use of a commercial process simulator, as an effective teaching tool in different engineering careers, are presented and discussed. These experiences were done at the Villa María Faculty of Engineering of the National Technological University in Argentina. The use of the commercial software Chem-CAD and its modules CC-Therm™ and CC-Batch™ for more than a decade in courses given to engineering students, especially in chemical engineering, is analyzed. Reference is also done to the experiences with students of mechanical engineering and with a graduate course in food technology. As an example, an academic work with junior and senior students of chemical engineering is described. The example shows how simulation and pilot plant experiments can be integrated in an efficient form. The main conclusion is the importance that this knowledge integration has for the teaching-learning process and for the formation of better engineers.
ResumenSe han utilizado los aproximantes de Padé para correlacionar algunas propiedades necesarias para el diseño y modelado de intercambiadores de calor de tubo y coraza usados en procesos de elaboración de aceites vegetales y sebo vacuno y en la producción de biodiesel, entre otras aplicaciones. Los aproximantes de Padé son funciones racionales que tienen la capacidad de representar funciones complejas con un número reducido de parámetros. Se ha considerado la densidad, el calor específico, la viscosidad y la conductividad térmica de estas sustancias y se han determinado los parámetros del modelo estudiado usando datos experimentales de estas propiedades. El modelo de Padé usado muestra ser adecuado para el cálculo de las propiedades estudiadas obteniendo desviaciones similares o inferiores a otros modelos altamente no lineales. Palabras clave: aproximantes de Padé, aceites vegetales, sebo vacuno, biodiesel Correlation of Vegetable Oil and Beef Tallow Properties Using Padé Approximants AbstractPadé approximants have been used to correlate some properties needed in the modeling and design of shell and tube heat exchangers used in the production of vegetables oils, beef tallow and biodiesel. Padé approximants are rational functions that have the capacity of representing complex functions with a reduce number of parameters. The properties considered were density, specific heat, viscosity and thermal conductivity of these substances and model parameters were determined using experimental data from the literature. The proposed general Padé model shows to be adequate to estimate the properties studied, obtaining deviations similar or lower than those of other highly non-linear models.
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