For the conditions of Prob. 22.1, estimate the minimum reflux ratio if the feed is liquid at the bubble point. About how many plates would be required at a reflux ratio 1.3 times the minimum?

Prob. 22.1

The feed to a conventional distillation column and the relative volatilities are shown in Table 22.2. The recovery of component 2 in the distillate is 99 percent, and 98 percent of component 3 is to leave in the bottoms. Calculate the minimum number of plates.

Table 22.2

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TABLE 22.2 Component 1 2 3 0.05 0.42 0.46 0.07 α 2.1 1.7 1.0 0.65