Chemistry Reference
In-Depth Information
10.5.1 q
uaTernary
m
ixed
s
olvenT
The solubilities of naphthalene in the water/methanol/1-propanol/1-butanol solvent
mixture are predicted using Equation 10.37. The molar volume of the ideal quater-
nary mixed solvent was calculated as
q
0
q
0
q
0
q
0
WxVx
=
+
V
+
x
Vx
+
V
(10.41)
HO
HO
MeOH
MeOH
PrOH
PrOH
BuO
H
BuOH
2
2
where
x
i
q
is the molar fraction of component i in the quaternary mixed solvent. The
two selected ternary subsystems I and II were water/methanol/1-propanol and water/
methanol/1-butanol with the compositions:
t, I
t, I
t, I
q
q
q
q
I (
y
=
x
+
x
,
y
=
x
and
y
=
x
) and
PrOH
BuOH
PrOH
HO
HO
MeOH
MeOH
2
2
t, II
t, II
t, II
q
q
q
q
II (
z
=
x
+
x
,
z
=
x
and
z
=
x
).
BuOH
BuOH
PrOH
HO
HO
MeOH
MeOH
2
2
The solubilities of naphthalene in the ternary subsystems I and II were calculated
as
developed earlier in ternary mixed solvents. It should be noted that the water/
methanol/1-propanol/1-butanol solvent is not completely miscible. Only the homo-
geneous regions of mixed solvents are considered here. The solubility predictions for
the quaternary mixed solvent are listed and compared with experiment in Table 10.2.
10.5.2 q
uinary
m
ixed
s
olvenT
The solubilities of naphthalene and anthracene in the quinary mixed solvents (water/
methanol/ethanol/isopropanol/acetone) were predicted using Equation 10.37. The
molar volume of an ideal quinary mixed solvent was calculated as
qu
0
qu
0
qu
0
qu
0
qu
0
WxVx
=
+
V
+
x
Vx
+
V
+
x
V
(10.42)
HO
HO
MeOH
MeOH
EtOH
EtOH
i-PrOH
i-PrOH
Acet
Acet
2
2
where
x
i
qu
is the molar fraction of component
i
in the quinary mixed solvent. The two
selected quaternary subsystems I and II were water/methanol/ethanol/isopropanol
and water/methanol/ethanol/acetone with the compositions:
q, I
q, I
q, I
q, I
qu
=+
,
y
qu
qu
qu
qu
I (
y
x
x
=
x
,
y
=
x
and
y
=
x
) and
i-PrOH
Acet
i-PrOH
HO
HO
MeOH
MeOH
EtOH
EtOH
2
2
q, I
q, I
q, I
q, I
qu
=+
,
z
qu
qu
qu
qu
II (
z
x
x
=
x
,
z
=
x
and
z
=
x
).
Acet
Acet
i-PrOH
HO
HO
MeOH
MeOH
EtOH
EtOH
2
2
The solubilities of naphthalene and anthracene in the quaternary subsystems I and
II were calculated as described in Section 10.5.1 “Quaternary Mixed Solvent.” The
results of the solubility prediction for quinary mixed solvent are listed and compared
with experiment in Table 10.2.
