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Composition of Methanol-Water Batch Distillation

Composition of Methanol-Water Batch Distillation. September 20, 2005. Prepared by: Jason Hixson Don Scott Michael Hickey. Objective. Determine the composition of liquid methanol-water binary system at equilibrium based on temperature in a distillation column.

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Composition of Methanol-Water Batch Distillation

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  1. Composition of Methanol-Water Batch Distillation September 20, 2005 Prepared by: Jason Hixson Don Scott Michael Hickey

  2. Objective • Determine the composition of liquid methanol-water binary system at equilibrium based on temperature in a distillation column.

  3. Vapor-Liquid Equilibrium Diagram Antoine Equation Vapor Pressure in mmHg of methanol and water. T is the absolute temperature A, B, and C are constants.

  4. Antoine Constants • Are calculated using using the known temperatures and vapor pressures from Perry’s Chemical Engineers Handbook. Methanol Water

  5. Antoine Constants • Arbitrary values are then chosen for A, B, and C giving an incorrect vapor pressure. • Excel solver is then used to find values of A, B and C for both methanol and water which gives the correct pressure.

  6. Van Laar’s Model Gamma correction factors for non-ideal system.

  7. Gamma Correction Factor A and B are constants Ideal Gas Constant = 1.987 cal/K*g-mol Temperature (K)

  8. Using data from Perry’s where P is 760 mmHg the constants A and B can be calculated using solver in Excel Gives

  9. Raoult’s Law Vapor Liquid

  10. Set Up = (Pcalc-Pactual) • Set arbitrary temperature Use Solver to minimize DIF cell by changing T(C).

  11. VLE Diagram Vapor Liquid

  12. Composition Calculation Using WFIT Program 0.38652+0.39727*B2-0.012737*B2^2+0.00013528*B2^3-(0.00000048036)*B2^4)+1%

  13. Reboiler Composition vs Time 0% Reflux 75% Reflux 2500 W Initial xm: 23% Initial Vm: 16.86 L

  14. Tray # 12 Composition vs Time 0% Reflux 75% Reflux 2500 W

  15. Tray # 11 Composition vs Time 0% Reflux 75% Reflux 2500 W

  16. Tray # 10 Composition vs Time 0% Reflux 75% Reflux 2500 W

  17. Tray # 9 Composition vs Time 0% Reflux 75% Reflux 2500 W

  18. Tray # 8 Composition vs Time 0% Reflux 75% Reflux 2500 W

  19. Tray # 7 Composition vs Time 0% Reflux 75% Reflux 2500 W

  20. Tray # 6 Composition vs Time 0% Reflux 75% Reflux 2500 W

  21. Tray # 5 Composition vs Time 0% Reflux 75% Reflux 2500 W

  22. Tray # 4 Composition vs Time 0% Reflux 75% Reflux 2500 W

  23. Tray # 3 Composition vs Time 0% Reflux 75% Reflux 2500 W

  24. Tray # 2 Composition vs Time 0% Reflux 75% Reflux 2500 W

  25. Tray # 1 Composition vs Time 0% Reflux 75% Reflux 2500 W

  26. Reflux Composition vs Time 0% Reflux 75% Reflux 2500 W Collected 1.69 L Collected 6.38 L

  27. Conclusions • At 0% reflux the amount of distillate collected was larger than 75% reflux. • At 75% reflux the purity of methane was a much higher quality. • If quality is more important then a high reflux percentage is needed. • If quantity and timeliness is more important then a low reflux is needed.

  28. QUESTIONS?

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