Information Technology Reference
In-Depth Information
Figure 2.4
Temperature-dependent binary interaction parameters.
where the element numbers in Figure 2.3 correspond to the parameters of equation (2.1).
Selection of the Results Binary Interactions with the tab T-Dependent and parameter
Wilson-1 displays the binary interaction parameters of the methanol-water system as
shown in Figure 2.4. The elements refer to the Aspen Plus implementation of the
Wilson equation for a binary pair:
b
ij
T
+
c
ij
ln
T
+
d
ij
T
+
e
ij
T
ln
γ
ij
=
a
ij
+
(2.2)
where
i
and
j
refer to the components and the element numbers correspond to the
parameters of equation (2.2); for example
a
ij
is element 1, and elements 9 and 10 refer
to the applicable temperature range. Similar results appear when selecting a different
activity coefficient equation.
2.2 PROPERTY ANALYSIS
Property Analysis enables the display of temperature-dependent properties at user-
selected temperatures as well as phase equilibrium data for both two and three phases.
Display of user-selected properties requires an analysis to be defined, including the vari-
able range over which the properties are to be presented. Aspen Plus presents forms
that need to be completed, similar to flowsheet run forms, followed by a properties
specification input. Clicking the Next button initiates a display in which the property
