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A distillation column is fed two feed streams containing components A and B, each at a flow rate of 100 mol/hr. Stream 1 is a saturated liquid containing 40 mole percent A and Stream 2 is a saturated liquid containing 60 mole per cent A. The distillate should contain 99 mol percent of component A and the bottom product should contain one mol percent A. The relative volatility of A to B is 2.5, independent of temperature. You are asked to consider two cases: Case 1. The two streams are mixed together and introduced to the column at the optimal location. After mixing, the feed to the column may be assumed to be a saturated liquid. The column has a partial reboiler and a total condenser. a) Find the minimum number of stages and the minimum reflux ratio. b) If the column is operated at a reflux ratio 1.2 times the minimum reflux ratio, what number of theoretical stages are required and where should the feed be added? Case 2. The two streams are added to the column, each at its optimal location. c) The column is operated at the same reflux ratio used in part b. How many theoretical stages are required and at what stage should each feed stream be introduced?
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