Separation Process Principles- 2n - Seader & Henley - Solutions Manual

Exercise 1332 subject improving a batch distillation

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Unformatted text preview: : Calculation of batch rectification of a ternary mixture with a process-simulation program. Given: Charge of 100 kmol of 30 mol% methanol, 30 mol% ethanol, and 40 mol% n-propanol at 120 kPa. Column with the equivalent of 10 theoretical stages, plus a still and a total condenser. Total reflux condition is established by time zero. UNIFAC method for liquidphase activity coefficients. Column pressure drop is 8 kPa. Condenser pressure drop is 2 kPa. Two operation steps, each of: 15 hours duration at a distillate flow rate of 2 kmol/h and a reflux ratio of 10. Assumptions: Negligible holdup in the column and the condenser system. Find: Mole-fraction compositions and amounts of each of the 3 products. Analysis: Use the Batch distillation program of Chemcad to make the calculations. The flowsheet below includes a batch column (1), a time switch (2), and 2 tanks (3 and 4). The following pages are printouts of the input data and the results of the calculations by the Chemcad program. This is followed by a summary of the results for the three products. Analysis: (continued) Process Simulator Input Data: Exercise 13.29 (continued) Analysis: (continued) Process-Simulator Results: Exercise 13.29 (continued) Analysis: (continued) Exercise 13.29 (continued) Summary of Results: Cut Amount, kmol Mole fractions: Methanol Ethanol n-Propanol Methanol-Rich 30 Ethanol-Rich 30 Propanol-Rich 40 0.923 0.077 0.000 0.077 0.871 0.052 0.000 0.039 0.961 Exercise 13.30 Subject: Calculation of batch rectification of a ternary mixture with a simulation program. Given: Charge of 100 kmol of 30 mol% methanol, 30 mol% ethanol, and 40 mol% n-propanol at 120 kPa. Column with the equivalent of 10 theoretical stages, plus a still and a total condenser. Total reflux condition is established by time zero. UNIFAC method for liquidphase activity coefficients. Column pressure drop is 8 kPa. Condenser pressure drop is 2 kPa. Three operation steps, each of: at a distillate flow rate of 2 kmol/h and a reflux ratio of 10. Duration of the operation steps: Step 1: 13 hours, Step 2: 4 hours, Step 3: 13 hours Assumptions: Negligible holdup in the column and the condenser system. Find: Mole-fraction compositions and amounts of each of the 4 products. Analysis: Use the Batch distillation program of Chemcad to make the calculations. The flowsheet below includes a batch column (1), a time switch (2), and 2 tanks (3, 4, and 5). The following pages are printouts of the input data and the results of the calculations by the Chemcad program. This is followed by a summary of the results for the three products. Analysis: (continued) Process Simulator Input Data: Exercise 13.30 (continued) Analysis: (continued) Process Simulator Results: Exercise 13.30 (continued) Exercise 13.30 (continued) Analysis: (continued) Process Simulator Results: Summary of Results: Product Amount, kmol Mole fractions: Methanol Ethanol n-Propanol Methanol-Rich 26 Slop Cut 8 Ethanol-Rich 26 Propanol-Rich 40 0.960 0.040 0.000 0.518 0.481 0.001 0.035...
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This document was uploaded on 02/24/2014 for the course CBE 2124 at NYU Poly.

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