3. Distillation with pressure change
If the composition of the azeotrope Az AB or the relative volatility α AB varies with pressure, a conventional distillation process can be used, introducing no entrainer, which therefore needs neither vaporization nor recovery.
Generally, the composition of the light component A in the azeotropic mixture increases as the pressure decreases, possibly until the azeotrope disappears.
Thus, for the homoazeotrope T max water (100 °C) – formic acid (100.8 °C),
x water = 0.42 at 1 atm (760 mmHg) (T azeo = 107.3 °C),
x ...
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Distillation with pressure change
Azeotropic distillation
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