Aspen strict radfrac distillation simulation
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Complete the calculation for the methanol column using the following data: Use a radfrac-based model for simulating the distillation column. Column feed: 63.2 wt% water, 36.8 wt% methanol; total flow rate = 6000 lb/hr; pressure = 20 psia, saturated liquid. Column specifications: 38 trays (40 theoretical stages); feed tray = 23 (24th theoretical stage). Total condenser; top pressure = 16.1 psia (absolute pressure); pressure drop per theoretical stage = 0.1 psi. Distillate flow rate = 1245 lbmol/hr; mole reflux ratio = 1.3. Use the NRTL-RK property method for simulation. Requirements: (1) Establish column design parameters to achieve the following two objectives: methanol content in the top distillate = 99.95 wt%, and water content at the bottom of the column = 99.90 wt%. (2) To meet these requirements, you can adjust the distillate flow rate (800–2500 lbmol/hr) and the reflux ratio (0.8–6). Ensure that the composition of the streams is reported on a mass basis before running the simulation. Record the load of the condenser and reboiler: Condenser load Reboiler load
This should be quite basic; do you want someone to calculate it for you?
No, may I ask what the problem is?
I gave it a try; it seems the issue was caused by a mismatch between the units for the feed and those for the distillate. After changing the unit for the feed to lbmol/hr, there were no more problems.