Predicting effective mass transfer area in randomly-packed column - Design considerations

Abstract

The paper describes the performance of a randomly packed distillation column depending on the effective vapor-liquid interfacial area (a,) and the flood ratio (per Cent Fl) estimated by the Eckert flooding model. Capacity, pressure gradient, and efficiency data obtained on 6.25 mm size of a Raschig-type ceramic ring are used to establish the basis for the model reliability analysis. The reliability of design models is analyzed against observed performance statistically by using a log-ratio objective function. The proposed a, approach for random packings is expected to be an improvement in data fit, clarifying the: simultaneous impact of packing geometry, loading, and system properties on the performance of a moderate scale packed column. Details underlying some aspects of selection of an appropriate packed Column design algorithm are discussed. An example of scaling-up a pilot-plant with respect to the resulting statistical factors is elucidated. Finally, an approach to design in terms of the derivatives of the function a(c) = f (per cent Fl) is interpreted analytically.