A mixture of ethyl alcohol and water containing 25 mole % of the alcohol is
fractionated in a continuous rectification column under all atmospheric pressure.
The required concentration of the overhead product is 80 mole %, and the
permissible alcohol content in the bottom product is not over 0.1 mole %. The
still of the column is supplied with direct steam. Calculate the operating reflux
ratio and the relative molar rates of flow of feed, the direct steam supplied and
the bottom product per kmol of overhead product.
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