Page 39 - Process simulation and control using Aspen

32 PROCESS SIMULATION AND CONTROL USING ASPEN

Specifying property method
Hit Next button or select Properties / Specifications in the column at the left side. In
Property method, scroll down to get RK-Soave. This equation of state model is chosen
for thermodynamic property predictions for the hydrocarbon mixture (see Figure 1.38).

. =1 3 JLi Si Mi bl
-
-
8
i
3;
F -3

. Q-S-o-'g-'ii -
D
FIGURE 1.38

Hitting ATex/ button twice, we have the following picture (see Figure 1.39). The binary
parameters are tabulated below. When we close this window or cbck OK on the message.
it implies that we approve the parameter values. However, we have the opportunity to
edit or enter the parameter values in the table. In blank spaces of the table, zeros are
there. It does not reveal that the ideal mixture assumption is used because many
thermodynamic models predict non-ideal behaviour with parameter values of zero.

T£msxS\zi zl 2 '-I H 21 61
t
3 .ifLdB&eMMI)
I -

n
m
TTD
-3
=w
:
3
MIX
« MMI *

FIGURE 1.39