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Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition by Phillip C. Wankat

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4.9.5 Stripping and Enriching Columns

Up to this point we have considered complete distillation columns with at least two sections. Columns with only a stripping section or only an enriching section are also commonly used. These are illustrated in Figures 4-24A and B. When only a stripping section is used, the feed must be a subcooled or saturated liquid. No reflux is used. A very pure bottoms product can be obtained but the vapor distillate will not be pure. In the enriching or rectifying column, on the other hand, the feed is a superheated vapor or a saturated vapor, and the distillate can be very pure but the bottoms will not be very pure. Striping columns and enriching columns are used when a pure distillate or a pure bottoms, respectively, ...

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