Chemistry Reference
In-Depth Information
Fig. 4 Vapor liquid equilibrium of the polycarbonate/chlorobenzene system at 140
C.
Symbols
represent experimental data;
lines
show predictions with SAFT [
41
]. Polycarbonate parameters
were fitted to density data only
Fig. 5 Vapor liquid equilibrium in polycarbonate/solvent systems. (a) Polycarbonate/ chloroben
zene at various temperatures. (b) Polycarbonate with various solvents at 140
C.
Symbols
represent
experimental data.
Lines
show SAFT calculations [
41
]
Using these parameters for predicting the vapor liquid equilibrium in the poly-
carbonate/chlorobenzene system (
k
ij
= 0) at 140
C leads to results shown in Fig.
4
.
It is obvious that the results are very unsatisfactory; a description of the experimen-
tal data also fails for any other value of the binary parameter
k
ij
.
Therefore, the
polycarbonate parameters
m
(uncertain since the molecular weight for the density
data was unknown) and
e
/
k
were refitted to the binary data in Fig.
5a
. Using these
new parameters
m
/
M
= 0.0080,
e
/
k
= 256.97 K and
v
00
= 17.114 cm
3
/mol, the
experimental data can now be described very well.
Although the polymer parameters were also fitted to binary data, they still have
the character of the pure-component parameters. This is confirmed by calculations
of other polymer/solvent systems, which are illustrated in Fig.
5b
. Using the same
polycarbonate parameters as determined for
the chlorobenzene system,
the
