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Figure 11.31
Operating step input, Stepone.
11.7 WORKSHOPS
Workshop 11.1a
A mixture of 50 mol/hr of benzene, 50 mol/hr of toluene, and 50
mol/hr of paraxylene is to be distilled at 1 atmosphere. The feed is a saturated liquid
at 1 atmosphere. The column is to operate at a reflux ratio of 2.8, and a 1-psi pressure
drop across the column is anticipated. Ninety-five percent of the benzene fed and no
more than 5% of the toluene fed is to be taken overhead. Use the shortcut distillation
block DISTWU to estimate the column performance. Generate a table of reflux ratio
versus theoretical stages required for this separation. Create a mixed unit set derived
from ENG, replacing
◦
F with degrees
◦
C and psi with mmHg for all Workshop 11.1
variations.
Workshop 11.1b
Repeat Workshop 11.1a using the physical properties option
NRTL. Compare to Workshop 11.1a.
Workshop 11.1c
Solve Workshop 11.1a rigorously using Radfrac. Employ 12 the-
oretical stages with feed on stage 6. Specify that 50 mol/hr of distillate is required.
Solve using the ideal property option. Compare to the results of Workshop 11.1a.
Workshop 11.1d
Repeat Workshop 11.1c, but use the property option NRTL. Com-
pare to the Workshop 11.1c results.
Workshop 11.2a
A mixture of 50 mol/hr of methanol, 50 mol/hr of ethanol, and
50 mol/hr of water is to be distilled at 1 atmosphere. The feed is a saturated liquid at
