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Figure 5.7. Gilliland's correlation, theoretical to real trays (used with permission of the American Chemical Society).

Figure 5.7. Gilliland's correlation, theoretical to real trays (used with permission of the American Chemical Society).

ing light ends formed in the process from the heavier liquid product. It may also be found in the oil production areas in use as a crude oil stabilizer. In this latter service, the column removes the light ends as a distillate liquid so that the bottoms product will have a vapor pressure less than atmospheric when stored at ambient temperature. The process objective is to make a sharp separation between discrete components, but, in this case as opposed to the previous example, the major portion of the tower feed consists of hydrocarbon liquid having defined physical properties rather than a componential description. The design procedure for calculating this type of tower is outlined in the following discussion.

Process Design Basis

This question is a little easier to resolve here than in the case of discrete-component fractionators since the only

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