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

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11.5 Synthesis of Column Sequences for Almost Ideal Multicomponent Distillation

A continuous distillation column is essentially a binary separator; that is, it separates a feed into two parts. For binary systems, both parts can be the desired pure products. However, for multicomponent systems, a simple single column is unable to separate all the components. For ternary systems, two columns are required to produce pure products; for four-component systems, three columns are required; and so forth. There are many ways in which these multiple columns can be coupled together for multicomponent separations. The choice of cascade can have a large effect on both capital and operating costs. In this section we will briefly look at the coupling of columns ...

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