A distillation column having eight theoretical stages (seven in the column + partial reboiler + total condenser) is being used to separate 100 krnol/h of a saturated-liquid feed containing 50 mol% A into a product stream containing 90 mol% A. The liquid-to-vapor molar ratio at the top plate is 0.75. The saturated-liquid feed is introduced on plate 5 from the top. Determine:

(a) The composition of the bottoms,

(b) The L/V ratio in the stripping section, and

(c) The moles of bottoms per hour. Unbeknown to the operators, the bolts holding plates 5, 6, and 7 rust through, and the plates fall into the still pot. If no adjustments are made, what is the new bottoms composition? It is suggested that, instead of returning reflux to the top plate, an equivalent amount of liquid product from another column be used as reflux. If this product contains 80 mol% A, what now is the composition of: (a) The distillate, and (b) Thebottoms.

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EQUILIBRIUM DATA, MOLE FRACTION OF A 0.19 0.37 0.19 0.5 0.62 0.71 0.2 0.5 0.78 0.6 0.9 0.96 0.9 0.8 0.84 0.3 0.4 0.5 0.1 0.7