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Manila Review Institute, Inc.Chemical Engineering Review

DISTILLATION

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Dr. Servillano Olano, Jr.

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Theory and Equations

Phase Equilibria in Distillation

Gibbs Phase Rule

For binary system:

φ = 2 – 2 + 2 = 2

Two degrees of freedom is needed to define equilibrium, e.g. � specifying temp and press will fix the compositions� specifying pressure and composition will fix temperature, etc

A = more volatile

B = less volatile

TA < TBpA > pB

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he boiling point of A is that at which

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Rayleigh’s Equation

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For abnormal Solutions

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