Defines the thermodynamic boundary concept without claiming a beverage-specific azeotropic proof limit.
The book moves from binary azeotropes to the topology of ternary systems.
An azeotrope behaves like a pseudocomponent and creates a separation boundary. In ternary systems it can divide the composition triangle into independent distillation subspaces, with a generally curved separation line that ordinary distillation at fixed conditions cannot simply cross.
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5.2.1–5.2.2.1, Azeotropic mixtures
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