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Distillation Column

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

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Distillation Column

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  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

  7. Theory in a graph

  8. The Column

  9. The Data

  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 • Distillation Column Manual, unpublished printed notes, Univ.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 ?

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