10_32_ps2_wgraph

# 10_32_ps2_wgraph - 10.32 Spring 2005 Problem Set 2 Due...

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10.32 Spring 2005 Problem Set 2 Due Wednesday, February 23, 2005 Problem 1 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?

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