In Figure 3, the vapor and the liquid compositions are the same at the highest boiling point of a mixture (the point b). When it condenses in a liquid composition, it changes as bàa4àa3àa2. During this change, the composition does not change; it stays at the liquid composition. At the point of a2, the first vapor is produced, and along the line between a2 and a2’, the liquid composition is changed to the vapor composition (a2’) which has higher mole fraction than the liquid composition (a2). However, the shape of a low-boiling azeotrope differs from the shape of a high-boiling azotrope. A low-boiling azeotrope is shown in Figure 4.
In Figure 3, the vapor and the liquid compositions are the same at the highest boiling point of a mixture (the point b). When it condenses in a liquid composition, it changes as bàa4àa3àa2. During this change, the composition does not change; it stays at the liquid composition. At the point of a2, the first vapor is produced, and along the line between a2 and a2’, the liquid composition is changed to the vapor composition (a2’) which has higher mole fraction than the liquid composition (a2). However, the shape of a low-boiling azeotrope differs from the shape of a high-boiling azotrope. A low-boiling azeotrope is shown in Figure 4.
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