Vapor liquid equilibrium using hysys

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  • 1. August 26, 2010
    1
    Vapor / Liquid Equilibrium Using HYSYS
    Prepared by:
    A.N.Tabish
    Lab. Engineer / Lecturer
    Department of Chemical Engineering
    UET, City Campus, Lahore
    tabish288@yahoo.com
  • 2. 2
    Example # 10.3:*
    For the system methanol (1) / methyl acetate (2) , the following equations provide a reasonable correlation for the activity coefficient
    Where,
    In addition following equations provide vapor pressures:
    Where T is in kelvin and the vapor pressure are in kPa.
    * J.M.Smith, H.C.Van Ness and M.M.Abott (2005), “Introduction to Chemical Engineering Thermodynamics”, Ed. 7, pp. 359, McGraw Hill
    August 26, 2010
    tabish288@yahoo.com
  • 3. August 26, 2010
    3
    CALCULATE:
    P and {y1}, for T = 318.15 K and {x1}= 0.25
    P and {x1}, for T = 318.15 K and {y1}= 0.60
    T and {y1}, for P = 101.33kPa and {x1}= 0.85
    T and {x1}, for P = 101.33kPa and {y1}= 0.40
    tabish288@yahoo.com
  • 4. August 26, 2010
    4
    Solution Strategy:
    • Start a new case in HYSYS.
    • 5. Define components
    • 6. Select Thermodynamic model.
    • 7. Draw the PFD (material streams)
    • 8. Define
    Composition
    Vapor fraction
    Mole/mass flow rate
    Temperature / Pressure
    • Determine BUBL/DEW Pressure/Temperature
    • 9. Determine composition using K-Value information
    tabish288@yahoo.com
  • 10. August 26, 2010
    5
    HYSYS:
    tabish288@yahoo.com
  • 11. August 26, 2010
    6
    • Start a new case in HYSYS.
    • 12. Define components (Methanol + Methyl Acetate).
    tabish288@yahoo.com
  • 13. August 26, 2010
    7
    • Select NRTL model.
    tabish288@yahoo.com
  • 14. August 26, 2010
    8
    • Draw the PFD (1 material streams)
    tabish288@yahoo.com
  • 15. August 26, 2010
    9
    • Vapor Pressure of Methanol
    44.51kPa using Antoine Equation
    • Vapor Pressure of Methyl Acetate
    65.64kPa using Antoine Equation
    tabish288@yahoo.com
  • 16. August 26, 2010
    10
    BUBL Pressure:
    P and {y1}, for T = 318.15 K and {x1}= 0.25
    73.50 kPa in manual calculations
    tabish288@yahoo.com
  • 17. August 26, 2010
    11
    Vapor compositions:
    y1 = 0.282
    y2 = 0.718
    y1 = 0.278
    y2 = 0.722
    tabish288@yahoo.com
  • 18. August 26, 2010
    12
    DEW Pressure:
    P and {x1}, for T = 318.15 K and {y1}= 0.60
    62.89 kPa in manual calculations
    tabish288@yahoo.com
  • 19. August 26, 2010
    13
    Liquid compositions:
    x1 = 0.8169
    x2 = 0.1831
    x1 = 0.8099
    x2 = 0.1901
    tabish288@yahoo.com
  • 20. August 26, 2010
    14
    BUBL Temperature:
    T and {y1}, for P = 101.33kPa and {x1}= 0.85
    331.20K = 58 oCin manual calculations
    tabish288@yahoo.com
  • 21. August 26, 2010
    15
    Vapor compositions:
    y1 = 0.670
    y2 = 0.330
    y1 = 0.671
    y2 = 0.329
    tabish288@yahoo.com
  • 22. August 26, 2010
    16
    DEW Temperature:
    T and {x1}, for P = 101.33kPa and {y1}= 0.40
    326.70K = 53.7 oC in manual calculations
    tabish288@yahoo.com
  • 23. August 26, 2010
    17
    Liquid compositions:
    x1 = 0.4602
    x2 = 0.5398
    x1 = 0.4517
    x2 = 0.5483
    tabish288@yahoo.com
  • 24. August 26, 2010
    18
    VLE Plot:
    • Download registry files from
    http://people.clarkson.edu/~wilcox/Design/EqPlots.dll
    http://people.clarkson.edu/~wilcox/Design/EqPlots.edf
    and save them to your computer at some safe place.
    • Create a case containing the components of interest and choose a suitable fluid package. 
    • 25. Go to the Simulation Environment
    • 26. Go to Tools/Preferences/Extensions and Click on Register an Extension. 
    • 27. Find EqPlots.dll and open it.  This will remain part of HYSYS or UniSim on your machine until it is Unregistered. Close Preference.
    • 28. Go to Flowsheet/Add Operation.  Select the Extensions category and Add Equilibrium Plots.  This should open the equilibrium plots extension.
    • 29. For a Binary plot, click the Binary tab at the bottom of the Equilibrium Plots menu, and select the components and the type of plot desired. 
    • 30. For an XY plot, specify either T or P, and click on Plot. 
    • 31. For a TXY plot, specify P.  For a PXY plot, specify T.
    tabish288@yahoo.com
  • 32. August 26, 2010
    19
    tabish288@yahoo.com
  • 33. August 26, 2010
    20
    tabish288@yahoo.com
  • 34. August 26, 2010
    21
    tabish288@yahoo.com
  • 35. August 26, 2010
    22
    Example # 10.4:*
    For a mixture of 10 mol-% methane, 20 mol-% ethane, and 70 mol-% propane at 50 (oF), determin:
    The dew point pressure
    The bubble point pressure
    * J.M.Smith, H.C.Van Ness and M.M.Abott (2005), “Introduction to Chemical Engineering Thermodynamics”, Ed. 7, pp. 364, McGraw Hill
    tabish288@yahoo.com
  • 36. August 26, 2010
    23
    Home Work Task:
    Assuming the validity of Raoult's law, do the following calculations for the benzene (l)/toluene (2) system:
    For the system ethyl ethanoate (1) and n-heptane (2)at 343.15 K (70"C)
    BUBL P calculation for T = 343.15 K (70°C), x1 = 0.05.
    DEW P calculation for T = 343.15 K (70°C), y1 = 0.05.
    tabish288@yahoo.com
  • 37. August 26, 2010
    24
    Home Work Task Contd….
    Make the following VLE calculations for the methane (l) / ethylene (2) / ethane (3) system:
    tabish288@yahoo.com