We know that many binary mixtures contain an azeotrope, which means that the liquid and vapor phases for the mixture have the same composition. Can a system have two azeotropes for a given pressure or temperature? If it exists, find a system and plot the data.

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Pressure (psia) 1400 1200 1000 800 600 400 200 0+ -100 -50 0 96.9% Ethene 100 Ao BO 50 Temperature (°F) FIGURE P10-30 P-T diagram for the ethene + n-heptane system at 96.9% by mole ethene. со 150 200 Based on W. B. Kay, Ind. Eng. Chem., 40, 1459 (1948).