Solvent A is to be separated from water by distillation to produce a distillate containing 95 mol% A at a 95% recovery. The feed is available in two saturated-liquid streams, one containing 40 mol% A and the other 60 mol% A. Each stream will provide 50 kmol/h of component A. The a is 3 and since the less-volatile component is water, it is proposed to supply the necessary reboiler heat in the form of open steam. For the preliminary design, the operating reflux ratio, L / D, is 1.33 times the minimum, using a total condenser. The overall plate efficiency is estimated to be 70%. How many plates will be required, and what will be the bottoms composition? Determine analytically the points necessary to locate the operating lines. Each feed should enter the column at its optimal location.