Five hundred kmol/h saturated liquid solution containing 53% Dimethylformamide, 42% Water, 0.1 % Diethyl ether, 2.5% Ethanol, 2.4 % 1- Butene is separated in a plate rectification column at lbar pressure. While all of the Diethyl ether and butane fed to the column is taken as the top product, all of the Dimethylformamide is taken as the bottom product. 99.95 % of the water and 80.70% of the ethanol in the feed is recovered as bottom product. d) the number of minimum number of stages required, e) the minimum reflux ratio, f) the number of ideal stages for a reflux ratio 1.5 times the minimum, g) the number of the stages at enriching and stripping sections. B Antoine equation: logP (bar) = A -; T(K)+C A B 4.24696 -8.256 4.022 1-Butene Diethyl ether Ethanol Water Dimethylformamide 1099.207 1062.64 1670.409 -44.93 5.37229 -40,191 5.40221 1838.675 -31.737 3.93068 1337.716 -82.648