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5 - 1 4 . A three - tray column is used to concentrate a binary mixture of ethanol and water. Liquid feed, at a
A threetray column is used to concentrate a binary mixture of ethanol and
water. Liquid feed, at a rate of mole and composition of mole
percent ethanol, is fed to the top tray.
Instead of using a reboiler in the bottom of the column, "live steam" pure
water vapor is fed in at a rate of mole below the first tray.
The liquid leaving the column from tray has a composition of mole percent
ethanol. Assume equimolal overflow and theoretical trays.
a What is the composition of the vapor leaving the top of the column?
b Assuming a simple VLE relationship what is the value in this
system?
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