Vapor liquid equilibrium using hysys

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Vapor liquid equilibrium using hysys

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

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