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the group numbers is provided at the bottom of the display, but they cannot be seen
unless the display is full size. The setup and results for this example may be found at
Examples/mvkwaterestimation.
2.4 WORKSHOPS
Displaying Properties
Open an Aspen Plus run selecting the blank simulation template with the Run type
Property Analysis. Use the Next key to proceed with the data input. The components
to be used are mesityl oxide and toluene. Select Unifac and Ideal to represent the vapor
and liquid phases, respectively.
Workshop 2.1 Select the Generic option for your property type and enter 50 mol/hr
for each component when required. Generate a T - x - y diagram at 14.7 psi. Use a
Property Set to choose which properties are required. Plot the T - x - y diagram. Display
all pure component parameters by using the Tools menu. Save the values of the boiling
point, critical temperature, and critical pressure.
Estimating Properties
Open an Aspen Plus run by selecting the blank simulation template with the Run type
Property Analysis. Use the Next key to proceed with the data input. The components
to be used are mso-e (mesityl oxide) and toluene. Treat mso-e as a user-defined
component even though it is in the data bank. Provide the molecular structure and
molecular weight only.
Workshop 2.2 Select Setup and estimation options, and estimate only the parameters
selected and pure component scalar properties. Under the Pure Component tab, choose
boiling point, critical temperature, and critical pressure for the component mso-e using
all available methods. Interpret the error messages.
Workshop 2.3 Remove the property estimation methods that caused the error mes-
sage, but ignore the warning message. Reinitialize and rerun.
Workshop 2.4 Repeat Workshop 2.3 but provide as input the true boiling point
of mesityl oxide: 129 . 76 C. Be sure to clear all entries under the setup menu entry
PCES. Clear the request to estimate the boiling point. Reinitialize and rerun. Compare
the results of Workshops 2.3 and 2.4.
Workshop Notes
Workshop 2.1 Unifac is used to estimate the vapor-liquid equilibrium for this system
to demonstrate the possibility of obtaining such data in the absence of experimental
values. If possible, experimental verification is extremely important.
Workshop 2.2 Although all methods for estimating the three properties appear avail-
able, some of the methods have limitations. For example, Ogata's method for estimating
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