The shortcut model is used to determine the number of equilibrium stages required at infinite reflux to accomplish a desired separation using the Fenske method. This method assumes that the relative volatilities for the components are constant throughout the column or a column section. This is a poor assumption for non-ideal systems particularly those modeled with LACT thermodynamics. However, this is a reasonable assumption for hydrocarbon systems which are modeled by EOS thermodynamics. Thus, for such systems useful information about the component splits may be obtained. For two product columns, the shortcut method can compute minimum reflux at infinite trays using the Underwood method. The Fenske and Underwood results are interpolated with the Gilliland relationship to produce a table of equilibrium trays versus reflux ratio for a practical operating range. This feature is very useful in the early design stages for hydrocarbon systems because it helps the user determine the number of theoretical trays for the desired separation and estimates of the product molar flowrates for simulation of a rigorous distillation column model.
About PRO/II: PRO/II is the major product in the Process Engineering Suite (PES). This process simulation software optimizes plant performance by improving process design, operational analysis, and performing engineering studies. It is designed to perform rigorous heat and material balance calculations for a wide range of chemical processes. PRO/II allows users to evaluate the use of heat integration with case studies, rigorously evaluate process improvements with the help of a process flow diagram (PFD), or model crude distillation units. PRO/II offers a wide variety of thermodynamic models to virtually every industry and is incredibly cost effective, decreasing both capital and operating costs.
Technical Support: As always, feel free to reach out to your local technical support team for more information.
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