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Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition by Phillip C. Wankat

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H. Computer Spreadsheet Problems

H1. Do part b of this problem with a spreadsheet or with MATLAB. The use of VBA is recommended if a spreadsheet is used. We have 200 kmol/h of a saturated liquid feed that is 35 mol% methanol, 40 mol% i-propanol, and 25 mol% n-propanol at 1.0 atm. We want 96.1% recovery of methanol in the distillate and 99.6% recovery of i-propanol in the bottoms. Assume CMO and constant relative volatilities. The column has a total condenser and a partial reboiler. L/D = 6. As a first guess, assume that n-propanol does not distribute (it all exits in the bottoms). Relative volatilities are: methanol = 3.58, i-propanol = 1.86, and n-propanol = 1.0.

a. Find D, B, xi,dist, and xi,bot.

b. Step off stages and find the optimum feed ...

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