Relevance
Zeotropic mixtures can be separated by normal distillation. The separation factor never becomes exactly 1 but might be very close to 1 making a separation by distillation very difficult or even technically impossible.
Some specific zeotropic mixtures are used as refrigerants (Code names are R-4xxx). Zeotropic mixtures have the disadvantage that their composition changes during the repeated evaporation and condensation processes. This causes a temperature glide – a change in the boiling temperature at constant pressure. Additionally, this leads to changing thermodynamic properties, notably, heat of vaporization and heat capacity which are the most important in the refrigeration process. Azeotropic mixtures on the other hand have constant properties at their azeotropic composition and behave like pure components. If zeotropic blends are used it is common to select mixtures with small separation factors (so called near-azeotropic mixtures).
Read more about this topic: Zeotropic Mixture
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