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How is relative volatilities defined?

asked Dec 27, 2015 in Process by RichS29 (4,320 points)

1 Answer

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answered Dec 31, 2015 by cobiesmith (3,310 points)
Relative volatilities or enrichment ratios are defined as the ratio of two K-values and are usually denoted by the

symbol αij , e.g.,

αij = Ki / Kj

For vapor-liquid-equilibrium, the K-value is defined as:

Ki = yi / xi

where yi and xi are the mole fractions of component i in the vapor and liquid phases.

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