(184a) Sieve Tray Efficiency Models: A Comparative Study Using FRI Data

Tray efficiency is an important variable in the design of new columns or the retrofit of existing columns. Over the years, several efficiency correlations have been presented in the literature. They ranged from fundamental models to more empirical models that were based on field data. Many of the fundamental models were based on the original AICHE model, where improvements were made to some of the drawbacks in the older model. The more recent development in fundamental models involves the application of bubbling and jetting zones on an operating tray. The newer models include the bimodal distribution of bubbles into small and large bubbles and the contribution of the jetting fraction to the overall froth. These models provide a continuous transition from spray to froth regime so that separate models are not needed for the two regimes. In contrast, the empirical models widely used by industry practitioners were developed from field data and relate tray efficiency to physical properties such as liquid viscosity and relative volatility. In this study, we present a comparison of different tray efficiency models and investigate their relative performance using FRI measured data on sieve tray efficiencies. An analysis of the key results from the study will be presented.