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7
2
DECANT
4
1
DIST
6
3
5
Figure 14.10
Methanol -water distillation with mesityl oxide sidestream.
The feed is available at its bubble point. A sidestream whose purpose is to remove
mesity oxide is required. The sidestream will be fed to a decanter with an auxiliary
feed of water. Two phases will be formed, one mesity oxide - rich, the other primarily
water. The mesity oxide phase will be removed and the aqueous phase returned to the
distillation column. A sketch of the process is shown in Figure 14.10. The following
is known about the ternary system: No ternary liquid - liquid equilibrium data exist
but a heterogeneous azeotrope has been observed; no vapor - liquid equilibrium for the
binary mesity oxide - methanol exists. Design the process concepts starting with the
steps given in Workshops 14.2a through 14.2h.
Workshop 14.2a
A mesity oxide - water azeotrope exits at 760 mmHg and 91
.
8
◦
C.
MSO in the vapor phase
65.2 wt%
MSO in the liquid phases
93.9 and 2.0 wt%
Determine the van Laar and Uniquac equations
a
i,j
binary parameters.
Workshop 14.2b
Estimate the vapor - liquid equilibrium of the methanol - mesity
oxide system at one 760 mmHg with a property analysis run using Unifac.
Workshop 14.2c
Regress the results of Workshop 14.2b to the
a
i,j
parameters of
the van Laar and Uniquac equations.
Workshop 14.2d
Fit the vapor - liquid equilibrium data for the methanol - water
system of Dunlop (1948) given in Table 14.2 to the van Laar and Uniquac equations
using the
a
i,j
parameters.
Workshop 14.2e
Develop the liquid - liquid equilibrium tie lines for the ternary
system and create a triangular ternary equilibrium diagram at 90
◦
CusingthevanLaar
equation.
