RECTIFICATION OF MULTICOMPONENT MIXTURES 253 On substituting the values of Eqs. 9-13 and 9-15 and rearranging,

In Case II, below the feed plate only the light key and less volatile components are considered; above the feed plate, only the heavy key and more volatile components are considered:

The solution of this equation is the same as Eq. (9-17), but instead of I and J, V and Jrespectively, are used. Where

D = mols of distillate per unit time

F = mols of feed per unit time n Otlk

JJ Oihk H

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