Figure 2.6: Pure component parameters for the n-alkane series as a function of the molar
mass.
Mw [g'moɪ]
0 SO ICO (SO 200 250 300 3S0 400
Mw [g'mo∣∣
where parameter(k) is one of {r∏i∕Mwi,σi,ti∕k'). The coefficients of the correlations
are given in table 2.3. The correlations are also plotted in figure 2.6. These correla-
tions are used to extrapolate the parameters for higher alkanes.
|
parameter (k) |
units |
qp⅛ |
q⅛ |
qafc |
|
m∕Mu, |
mol∕g |
3.626670923 |
0.44366558 |
0.373239091 |
|
σ |
 |
0.045349657 |
-0.021681925 |
-0.001005353 |
|
e∕k |
K |
209.4657254 |
64.23483985 |
5.152948312 |
Table 2.3: Constants used in the correlation presented in Eq. (2.31) for the dependence of
SAFT-D parameters on molecular weight of n-alkanes.
Figure 2.7 compares experimental saturated liquid densities of tetracosane(n-
C24), triacontane(n-C30), and hexatriacontane(n-C36), with those calculated from
PC-SAFT and the new equation of state using extrapolated parameters. The new
EOS performs better than PC-SAFT and give reasonably accurate densities for all
three components in the range of temperature considered.
52