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Redesign Analysis of a Distillation Column

Redesign Analysis of a Distillation Column. Presented By: Michael Hoepfner University of Utah 2006. Introduction. Why care about redesign?. Outline. Objective Theory Experiment Results Aspen Analysis Recommendations Conclusion / Summary . Objective. Scope

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Redesign Analysis of a Distillation Column

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  1. Redesign Analysis of a Distillation Column Presented By: Michael Hoepfner University of Utah 2006

  2. Introduction • Why care about redesign?

  3. Outline • Objective • Theory • Experiment • Results • Aspen Analysis • Recommendations • Conclusion / Summary

  4. Objective • Scope • Isopropyl Alcohol (IPA) and Water to Ethanol (EtOH) and Water • Purpose • Is the switch possible? • What are the limitations?

  5. Outline • Objective • Theory • Experiment • Results • Aspen Analysis • Recommendations • Conclusion / Summary

  6. Theory • Distillation • Is among the most common of separations • Separates compounds based on volatility • Utilizes multiple equilibrium separations

  7. Theory (cont.) T-x-y Diagram x-y Diagram Source: Perry’s Chemical Engineering Handbook, 7th Ed.

  8. Theory (cont.) • McCabe-Thiele • Simple and useful tool for defining a distillation column • Three lines can characterize the conditions Source: Seader, 2006

  9. Theory (cont.) Source: Seader, 2006

  10. Theory (cont.) • Efficiency • Liquid samples, therefore, liquid efficiency Source: King, 1971

  11. Theory (cont.) • Refractive Index (RI) was used to measure the concentration Source: CRC Handbook of Chemistry and Physics, 64th Edition

  12. Outline • Objective • Theory • Experiment • Results • Aspen Analysis • Recommendations • Conclusion / Summary

  13. Experiment • Apparatus • 12 Trays with 3 inch bubble caps • Total Condenser • Partial Reboiler • Thermal couple at every tray Source: Ong, 1952

  14. Experiment (cont.) • Operate at total reflux • Collect samples for efficiency determination • Operate at 2 times the minimum reflux • Collect samples for efficiency determination • Model results in Aspen for ethanol and water

  15. Outline • Objective • Theory • Experiment • Results • Aspen Analysis • Recommendations • Conclusion / Summary

  16. Results • Obtained samples on three separate occasions • Samples are numbered by the date collected • 10/30/2006 • First run of total reflux • 11/01/2006 • Second run of total reflux • 11/06/2006 • Only run of partial reflux

  17. Results (cont.)Concentration of Samples

  18. Results (cont.) • Efficiency • Two reasonably reliable data sets • All error is at a 95% confidence interval

  19. Outline • Objective • Theory • Experiment • Results • Aspen Analysis • Recommendations • Conclusion / Summary

  20. Aspen Analysis • Aspen • Used average stage efficiency for every stage • It is possible to do separation • Limited by total condenser load • Max condenser load: 278±11 kW • Max reboiler load: 2410±20 kW

  21. Aspen Analysis (cont.)

  22. Outline • Objective • Theory • Experiment • Results • Aspen Analysis • Recommendations • Conclusion / Summary

  23. Recommendations • Ethanol separation is possible • Max feed 7.55±0.30 GPM of 15 mole % ethanol • Reboiler steam required 10.18±0.40 kg/min • By redesigning the condenser, capacity can be greatly increased • Reboiler only at ~1/6th of capacity • Allow more time for partial reflux efficiency

  24. Outline • Objective • Theory • Experiment • Results • Aspen Analysis • Recommendations • Conclusion / Summary

  25. Conclusion / Summary • Redesign analysis is an important part of chemical processing • Distillation column in senior lab is about 25.3 ± 3.7 % efficient • Ethanol and water separation is possible • Limited by the total condenser

  26. Sources • Weast, Robert C, Editor. CRC Handbook of Chemistry and Physics, 64th Edition. CRC Press, Inc. Boca Raton, 1983. p. D-253. • King, C. Judsen. Separation Processes. McGraw-Hill, New York,1971. p 603. • Ong, John N. Jr, Jack M. Whitney. “The Operation of a Laboratory Bubble-Plate Distillation Column”. University of Utah, June, 1952. • Perry, Robert H., Editor. Perry’s Chemical Engineering Handbook. 7th Edition. McGraw-Hill. New York, 1999. p. 115. • Seader, J. D., Ernest J. Henley. Separation Process Principles, 2nd Edition. John Wiley and Sons. Hoboken, 2006. p. 193-294. • Silcox, Geoff. “Basic Analysis of Data”. Unpublished student aid. University of Utah, 1999.

  27. Questions?

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