{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

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

# Exercise 1332 subject improving a batch distillation

This preview shows page 1. Sign up to view the full content.

This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online