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# 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:
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• 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.
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• 14. August 26, 2010
8
• Draw the PFD (1 material streams)
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• 15. August 26, 2010
9
• Vapor Pressure of Methanol
44.51kPa using Antoine Equation
• Vapor Pressure of Methyl Acetate
65.64kPa using Antoine Equation
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• 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
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• 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:
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.
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• 32. August 26, 2010
19
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• 33. August 26, 2010
20
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• 34. August 26, 2010
21
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• 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
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• 36. August 26, 2010
23