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

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3.1 Developing a Distillation Cascade

In Chapter 2, we learned how to do the calculations for flash distillation. Flash distillation is a very simple unit operation, but in most cases it produces a limited amount of separation. In Problems 2.D2, 2.D5, and 2.F2 we saw that more separation could be obtained by adding on (or cascading) more flash separators. The cascading procedure can be extended into a process that produces one pure vapor and one pure liquid product. First, we could send the vapor streams to additional flash chambers at increasing pressures and the liquid streams to flash chambers with decreasing pressures, as shown in Figure 3-1. Stream V1 will have a high concentration of the more volatile component, and stream L5 will have ...

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