CENG 221

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CENG 221 Lecture 4. Multi-component Distillation
(4.5 h) Learning Objectives (1)
Multi-component flash distillation calculation
(2) Multi-component column distillation Fenske
Equation Underwood Equation Gilliland
Correlation (3) Column sizing Column
diameter Column height (4) Introduction to
packed column Learning Guides (1) Lecture
handouts (2) Chapters 3.3, 7.1, 9.1-9.3,
12.1, 12.3, 13.3 of Textbook
Equilibrium-Staged Separations
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Multi-component Column Distillation
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Multi-component Column Distillation
A 2000 kmole/h feed containing benzene (0.2),
toluene (0.3) and xylene (0.5) are to be
separated using the distillation column shown
above. 90 percent of the toluene is to be
recovered at the distillate and 98 percent of
xylenes is produced at the bottom. (a) label the
key and non-key components (b) what is the value
of D and B? (b) what is the distillate and bottom
composition?
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Column Distillation
A 100 kmole/h feed containing methanol (0.3) and
water (0.7) is to be separated using the
distillation column shown above. 90 percent of
the methanol is to be recovered at the distillate
and 90 percent of water is produced at the
bottom. (a) label the key and non-key
components (b) what is the value of D and B? (c)
what is the distillate and bottom composition?
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Fenske Equation (Total Reflux)
Calculates for Nmin Nmin Ln
(xA/xB)d/(xA/xB)b
Ln aAB
where xA is concentration of key component A
(usually LKC) xB is concentration of
key component B (usually HKC
For binary components Nmin Ln
(xA/1-xA)d/(xA/1-xA)b
Ln aAB
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