Application of Air/Water Derived Mass Transfer Models to Distillation
In this presentation, two recent structured packing mass transfer models developed by SRP researchers will be presented and compared with packed column distillation efficiency data. The distillation data are based on the cyclohexane/n-heptane test mixture operated at total reflux and four pressures (2.4, 4.83, 24 and 60 psia). An advantage of the test mixture is the pressure variation allows for changes in the liquid film mass transfer resistance which is often mistakenly neglected in distillation design. Both sets of mass transfer models were developed using air/water related test mixtures with relatively minor variations in overall physical properties. The application of the air/water derived models will be challenged by the wide range of distillation physical properties. The presentation also provides a methodology for estimating a packing HETP based on physical property and flow information obtained from a process simulation.
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