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

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8.2 Binary Heterogeneous Azeotropic Distillation Processes

The presence of an azeotrope can be used to separate an azeotropic system. This is most convenient if the azeotrope is heterogeneous; that is, the vapor from the azeotrope will condense to form two liquid phases that are immiscible. Azeotropic distillation is often performed by adding a solvent or entrainer that forms an azeotrope with one or both of the components. Before discussing these more complex azeotropic distillation systems in Section 8.7, let us consider the simpler binary systems that form a heterogeneous azeotrope.

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