Page 2
Experimental observations on the behavior of a mixture of hexane (composition denoted as
x
1
or as
x
H
)
and trimethylamine (x
2
or
x
T
) at two equilibrium conditions at a constant pressure
P
= 0.7 bar.
x-y diagram at 0.7 bar
T-x-y diagram at 0.7 bar
Page 3
2)
General conditions for phase equilibrium in vapor-liquid mixtures
a.
Equilibrium conditions
Equality of temperatures
T
L
=
T
V
=
T
Equality of pressures
P
L
=
P
V
=
P
Equality of species fugacities
f
L
1
(
T
,
P
,
x
)
=
f
V
1
(
T
,
P
,
y
)
f
L
2
(
T
,
P
,
x
)
=
f
V
2
(
T
,
P
,
y
)
!
f
L
C
(
T
,
P
,
x
)
=
f
V
C
(
T
,
P
,
y
)
!
"
#
#
#
$
#
#
#
(1)
b.
Other constraints
Liquid composition
x
1
+
x
2
+
!
+
x
C
=
1
Gas composition
y
1
+
y
2
+
!
+
y
C
=
1
Sum of fugacities
f
L
1
(
T
,
P
,
x
)
+
f
L
2
(
T
,
P
,
x
)
+
!
+
f
L
C
(
T
,
P
,
x
)
=
f
V
1
(
T
,
P
,
y
)
+
f
V
2
(
T
,
P
,
y
)
+
!
+
f
V
C
(
T
,
P
,
y
)
(2)