HETP Prediction

HETP Prediction HETP can be predicted from mass-transfer models, rules of thumb, and data interpolation. 

These uncertainties question the validity of the above theory. Due to the poor understanding of this phenomenon, it is best to exercise caution with HETP predictions for all of the following types of systems on structured packings aqueous, high surface tension, high liquid viscosity, and high relative volatility. 

Because there are only few variables that significantly affect randompacking HETP (Sec. 9.1.3), and due to the unreliability of even the best mass transfer model, rules of thumb for HETP successfully compete with mass transfer models. It has been the author s experience that rules of thumb for HETP prediction are more accurate and more reliable than mass transfer models. A similar conclusion was reached by Porter and Jenkins (127). 

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