Azeotropes: ConcepTest and Example Problem

Try to answer this ConcepTest and solve the example problem before using this module. Studies show that trying to answer the questions before studying material improves learning and retention. We suggest that you write down the reasons for your answers. By the end of this module, you should be able to answer these on your own. Answers will be given at the end of this module.

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Example Problem 1

A binary system is in vapor-liquid equilibrium at 80.°C and 0.28-bar pressure, and x1 = 0.20, y1 = 0.54. At 80°C, P1sat = 0.35 bar, P2sat = 0.15 bar. Does this system possess an azeotrope at 80°C? If yes, what is its composition? If no, show why not. Assume the liquid phase obeys a simplified form of the Margules equation: GE = Bx1x2RT