From this equation the amount of liquid to be distilled in order to obtain a liquid of given concentration in the still may be calculated, and from this the average composition of the distillate may be found by a mass balance.

Alternatively, if the relative volatility is assumed constant over the range concerned, then y = ax/(1 + (a — 1)x), equation 11.15 may be substituted in equation 11.28. This leads to the solution:

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