The feed to a conventional distillation column and the relative volatilities are shown in the following table. The recovery of component 2 in the distillate is 99% and 98% of component 3 is to leave in the bottoms. Estimate the minimum reflux ratio if the feed is liquid at the boiling point. About how many plates would be required at a reflux ratio 1.3 times the minimum?
Component
Mole fraction
Relative volatility
1
0.05
2.10
2
0.42
1.70
3
0.46
1.00
4
0.07
0.65
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