1. Distillation Column By Jesse Reeves

2. Outline Where we are, where we want to be. How to get there. What we used and what we got. The trouble. The model.

3. What we have 12 tray bubble-cap distillation column Isoproply alcohol water separation

4. What we want Same distillation column Ethanol water separation

5. 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

6. Theory to get there Equilibrium curveStripping operating line Rectifying operating lineMurphree-vapor efficiency

7. Theory in a graph

8. The Column

9. The Data Calibration StageStateMethodMass%IPAErrory* Mass% AveErrorEmv eqError 2LiquidPycnometer83.20142.714585.02.5 3LiquidPycnometer81.48792.993884.02.568.2106192.6003 4LiquidPycnometer78.41662.649483.02.567.0089102.1962 5LiquidPycnometer81.61132.702184.02.5-133.7437-259.9631 6LiquidPycnometer77.05892.595482.02.592.1339101.3146 7LiquidPycnometer54.86302.129479.02.591.957918.7079 8LiquidPycnometer53.51252.146179.02.55.298611.8814 9LiquidPycnometer23.97601.660575.02.557.88746.3146 10LiquidRI4.88890.574855.02.538.08964.0122 11LiquidRI1.77780.569135.02.59.36452.5398 12LiquidRI5.55560.575260.02.5-6.9388-1.5218

10. The Trouble

11. The IPA separation

12. The ETOH separation

13. The model The IPA Aspen model -4.7% at the top +8.4% at the bottom The three important stages 7, 9, and 10 Murphree- vapor efficiencies were 91.9+18.7%, 57.9+6.3%, 38.4+4.0% Overall column efficiency 8.3% Stage efficiency did not matter

14. 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%

15. 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.

16. Special thanks to team-J Jaron Stanley: Team Leader James Gardner: Operator Jesse Reeves: Team player

17. 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 Distillation Column Manual, unpublished printed notes, Univ.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.

18. Questions ?