Vapor-Liquid Equilibrium using HYSYS

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Presentation Description

Hysys is a powerful tool to be used for vapor-liquid equilibrium calculations. this presentation is also based on the equilibrium calculation of a system taken from "introduction to chemical engineering thermodynamics". the presentation is designed for very biggeners of Hysys.

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By: AspenTechHysys (111 month(s) ago)

thank you very much

Presentation Transcript

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August 25, 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

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2 For the system methanol (1) / methyl acetate (2) , the following equations provide a reasonable correlation for the activity coefficient Example # 10.3:* * J.M.Smith, H.C.Van Ness and M.M.Abott (2005), “Introduction to Chemical Engineering Thermodynamics”, Ed. 7, pp. 359, McGraw Hill Where, In addition following equations provide vapor pressures: Where T is in kelvin and the vapor pressure are in kPa. August 25, 2010 tabish288@yahoo.com

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August 25, 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

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August 25, 2010 4 Solution Strategy: Start a new case in HYSYS. Define components Select Thermodynamic model. Draw the PFD (material streams) Define Composition Vapor fraction Mole/mass flow rate Temperature / Pressure Determine BUBL/DEW Pressure/Temperature Determine composition using K-Value information tabish288@yahoo.com

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August 25, 2010 5 HYSYS: tabish288@yahoo.com

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August 25, 2010 6 Start a new case in HYSYS. Define components (Methanol + Methyl Acetate). tabish288@yahoo.com

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August 25, 2010 7 Select NRTL model. tabish288@yahoo.com

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August 25, 2010 8 Draw the PFD (1 material streams) tabish288@yahoo.com

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August 25, 2010 9 Vapor Pressure of Methanol Vapor Pressure of Methyl Acetate 44.51kPa using Antoine Equation 65.64kPa using Antoine Equation tabish288@yahoo.com

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August 25, 2010 10 BUBL Pressure: 73.50 kPa in manual calculations P and {y1}, for T = 318.15 K and {x1}= 0.25 tabish288@yahoo.com

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August 25, 2010 11 Vapor compositions: y1 = 0.282 y2 = 0.718 y1 = 0.278 y2 = 0.722 tabish288@yahoo.com

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August 25, 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

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August 25, 2010 13 Liquid compositions: x1 = 0.8169 x2 = 0.1831 x1 = 0.8099 x2 = 0.1901 tabish288@yahoo.com

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August 25, 2010 14 T and {y1}, for P = 101.33kPa and {x1}= 0.85 BUBL Temperature: 331.20K = 58 oC in manual calculations tabish288@yahoo.com

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August 25, 2010 15 Vapor compositions: y1 = 0.670 y2 = 0.330 y1 = 0.671 y2 = 0.329 tabish288@yahoo.com

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August 25, 2010 16 T and {x1}, for P = 101.33kPa and {y1}= 0.40 DEW Temperature: 326.70K = 53.7 oC in manual calculations tabish288@yahoo.com

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August 25, 2010 17 Liquid compositions: x1 = 0.4602 x2 = 0.5398 x1 = 0.4517 x2 = 0.5483 tabish288@yahoo.com

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August 25, 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.  Go to the Simulation Environment Go to Tools/Preferences/Extensions and Click on Register an Extension.  Find EqPlots.dll and open it.  This will remain part of HYSYS or UniSim on your machine until it is Unregistered. Close Preference. Go to Flowsheet/Add Operation.  Select the Extensions category and Add Equilibrium Plots.  This should open the equilibrium plots extension. 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.  For an XY plot, specify either T or P, and click on Plot.  For a TXY plot, specify P.  For a PXY plot, specify T. tabish288@yahoo.com

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August 25, 2010 19 tabish288@yahoo.com

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August 25, 2010 20 tabish288@yahoo.com

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August 25, 2010 21 tabish288@yahoo.com

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August 25, 2010 22 Example # 10.4:* * J.M.Smith, H.C.Van Ness and M.M.Abott (2005), “Introduction to Chemical Engineering Thermodynamics”, Ed. 7, pp. 364, McGraw Hill 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 tabish288@yahoo.com

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August 25, 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

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August 25, 2010 24 Home Work Task Contd…. Make the following VLE calculations for the methane (l) / ethylene (2) / ethane (3) system: tabish288@yahoo.com

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