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 푃푃푖푖표표is vapor pressure of component 푖푖 at system temperature  푝푝푖푖is partial pressure of component 푖푖 in gas phase Partial pressure of vapor in the gas phase in equilibrium with pure liquid is equal to its vapor pressure at the system temperature.

Every liquid has vapor pressure  Physical property  Vapor pressure is a function of temperature  A liquid boils when vapor pressure = system pressure.In the PT diagram, GAS on the left of TĬ is called VAPOR  Condensed by compression at constant temperature or by cooling at constant pressure.Separation of mixtures requires at least two phases  Vapor/gas – liquid  Liquid – liquid  Vapor/gas – solid  Liquid – solid.Chapter 2 (sections 2 to 2, 2, 2.4, 2.4 and 2) – 4th Edition Vapor pressure and phase equilibrium (Watch Online Lecture 1a).Chapter 2 (sections 2 to 2, 2, 2.4, and 2) – 2nd and 3rd Editions.Warning: TT: undefined function: 32 Binary Flash Distillation ∗ Concept of vapor-liquid equilibrium  Equilibrium relationships ∗ Flash distillation  Design issues  Binary flash distillation design  Problem to test your understanding