ven1401004 - VEN 140 -Spring 2010 Distilled Beverage...

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1 VEN 140 -Spring 2010 Distilled Beverage Technology Vapor-Liquid Equilibria – Non-Ideal Binary Systems Roger Boulton 3154 RMI North rbboulton@ucdavis.edu Vapor-Liquid Equilibria Want to Calculate the Boiling Point and X-Y Diagram of a Non-Ideal Binary Solution
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2 Antoine’s Equation Log P° = A - B . T + C Where Pº is vapor pressure of pure component in mmHg T is the temperature in ºC A, B, C, are constants for any given substance. Modified Raoult’s Law Pa = ?a*Xa * Paº Pa = partial vapor pressure of a component a ?a = activity coefficient Xa = mole fraction of component a Paº= vapor pressure of pure component a at given temperature.
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3 Activity Coefficients γ a = Pa (actual) Pa (ideal) The activity coefficient maybe either greater than 1.0 (position deviation from ideality) or less than 1.0 (negative deviation) from ideality, depending on the chemical system. Ethanol-Water display positive deviations Prediction of Activity Coefficients Van Laar’s Equation or Margules’ Equation
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4 Van Laar Equation Log γ a = Cab * Xb 2 . [Xa * Cab/Cba + Xb] 2 Log γ b = Cba * Xa 2 . [Xb * Cba/Cab + Xa]
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ven1401004 - VEN 140 -Spring 2010 Distilled Beverage...

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