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Liquid composition (mole fraction light) Figure 1.9 xy curves for relative volatilities of 1.3, 2, and 5.

Figure 1.9 gives xy curves for several values of a, assuming that a is constant over the entire composition space.

In the multicomponent case, a similar relationship can be derived. Suppose that there are NC components. Component 1 is the lightest, component 2 is the next lightest, and so forth down to the heaviest of all the components, component H. We define the relative volatility of component j with respect to component H as a,:

Solving for yj and summing all the y values (which must add to unity) give yj

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