Distillation Column By Jesse Reeves Outline Where we are, where we want to be. How to get there. What we used and what we got. The trouble. The model. What we have 12 tray bubble-cap distillation column Isoproply alcohol water separation What we want Same distillation column Ethanol water separation
How to get there Operate column at total reflux Determine stage efficiency Model the column in Aspen Compare Aspen model to real IPA separation results Apply the Aspen model to an Ethanol separation Theory to get there Equilibrium curve 1, 2 x1 y1 1 x1 ( 1, 2 1) Rectifying operating line Ln D y n 1 xn xD Vn 1 Vn 1
Stripping operating line y m 1 L B xm xb V V Murphree-vapor efficiency E mv y i , n 1 y i , n y i , n 1 y i*, n Theory in a graph m ole fraction of the light key com ponent in vapor Gene ric Equilibrium Curve
1 0.8 0.6 0.4 0.2 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 mole fraction of the light component in liqu
0.9 1 Total Condenser The Column Stage 2 Stage 3 Distillation Collumn Stage 4 Stage 5 Stage 6 Stage 7
Stage 8 Stage 9 Stage 10 Stage 11 Stage 12 Reboiler Feed Tank Pump The Data Calibration Stage State 2
16:48:00 17:02:24 17:16:48 17:31:12 17:45:36 The IPA separation The ETOH separation The model The IPA Aspen model
-4.7% at the top +8.4% at the bottom The three important stages 7, 9, and 10 Murphreevapor efficiencies were 91.9+18.7%, 57.9+6.3%, 38.4+4.0% Overall column efficiency 8.3% Stage efficiency did not matter The Aspen model for ETOH Max flow rate: 2.13 GPM Steam flow rate: 1.67 kg/min Condenser heat duty: -1739 kJ/min Feed composition: 2.5 wt% ETOH Distillate composition: 40 wt% ETOH ETOH recovery: 99.4% Recomendations Replace the automatic control valve for the steam flow to the reboiler. Replace the leaky manual steam valve. Refine the ETOH model with steady state data.
Special thanks to team-J Jaron Stanley: Team Leader James Gardner: Operator Jesse Reeves: Team player References Seader, J. D., Henley, Ernest J., Separation Process Principles, John Wiley & Sons, Inc. pp. 44, 301, 358-397 (1998). Distillation Column Manual, unpublished printed notes, Univ. of Utah, Salt Lake City, Utah 1997. Questions ?
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