CHAPTER 12 EQUILIBRIUM CONDITIONS IN MULTICOMPONENT SYSTEMS
12.5 SOLID–LIQUIDEQUILIBRIA 384
0 0:2 0:4 0:6 0:8 1:0
240
250
260
270
280
xB
Tf
;A
=K
ut
ut
ut
ut
ut
bc
bc
bc
bc
bc
bc
Figure 12.4 Dependence on composition of the freezing point of binary liquid mix-
tures with benzene as component A.aSolid curve: calculated for an ideal liquid mix-
ture (Eq.12.5.2), taking the temperature variation ofÅsol,AH into account. Open
circles: B = toluene. Open triangles: B = cyclohexane.
aExperimental data from Ref. [ 122 ].
0:5
1
2
5
0
1
(^0) xB 1
Tf
;A
=T
f
Figure 12.5 Freezing-point curves of ideal binary liquid mixtures. The solid is com-
ponent A. Each curve is calculated from Eq.12.5.4and is labeled with the value of
Åfus,AH=RTf;A.
The result, after some rearrangement, is
lnxAD
Åfus,AH
R
1
Tf;A