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TABLE 7.1 Feeds for Workshop 7.1
Component
Feed 1 (lbmol/hr)
Feed 2 (lbmol/hr)
Ethanol
40
Water
50
Acetone
10
Workshop 7.2
Based on the solution to Workshop 7.1, using 760 mmHg as a base
case, create a sensitivity study for pressure varying between 10 and 760 mmHg. Show
the effect of varying flash pressure on fraction vaporized, mole fraction acetone in the
vapor and liquid, and flash temperature using Aspen Plus's stored Uniquac parameters.
Workshop 7.3
The feeds in Table 7.2 are to be fed to a Flash3 block at a pressure
of 760 mmHg and a temperature of 80
◦
C. Using Aspen's stored Uniquac parameters,
use a sensitivity study to find the temperature at which the vapor phase disappears
when operating at 760 mmHg. The temperature and pressure of both feeds are 25
◦
C
and 760 mmHg.
TABLE 7.2 Feeds for Workshop 7.3
Component
Feed 1 (lbmol/hr)
Feed 2 (lbmol/hr)
Ethanol
10
Water
40
Toluene
50
Workshop 7.4a
Using the feeds from Workshop 7.3, employ the Decant block
to calculate the composition and quantity of the resulting phases at 25
◦
Cusingthe
parameters provided in Table 7.3. Be sure to set up appropriate units.
TABLE 7.3 Uniquac Parameters for a Toluene-Water-Ethanol System
Parameter/
Parameter Estimate
Element No.
Component Pair
(SI units)
UNIQ/2
Toluene - H
2
O
−
926
.
6623
UNIQ/2
H
2
O-Toluene
−
258
.
8106
UNIQ/2
EtOH - H
2
O
301.8589
UNIQ/2
H
2
O-EtOH
−
119
.
5998
UNIQ/2
EtOH - Toluene
−
49
.
37053
UNIQ/2
Toluene - EtOH
−
100
.
2406
Workshop 7.4b
Develop a sensitivity study to determine the effect of temperature
on this operation. Vary the temperature from 30 to 100
◦
C, displaying the amount of
ethanol extracted into the water-rich phase and the ethanol composition of the toluene-
rich phase. Be sure that the base case is executed last. Note all observations concerning
this sensitivity study. Are the results reasonable?
