A distillation column with a partial condenser and a total vaporizer is separating acetone and ethanol. The first feeding is 5 kmol/min. This feed contains z_F1 of the lightweight component and has a quality q1. The second feed is 10 kmol/min with a fraction of the lightest component of z_F2 and has a quality q2. The distillate contains 95 mol % of the light component and comes out as a saturated liquid. The funds contain 2 mol % of the component light. The pressure of the column is 1 atm. The reflux returns as saturated fluid. The column is adiabatic The external reflux ratio is L/D = R. Assume constant molal effusion. stagger stages from top to bottom.

Important variables

zF1 = 0.4, zF2 = 0.6, q1 = 0.5, q2 = 0.5, R = 2, depletion zone.

x	y	x	y
0.00	0.000	0.40	0.605
0.10	0.262	0.50	0.674
0.15	0.348	0.60	0.739
0.20	0.417	0.70	0.802
0.25	0.478	0.80	0.865
0.30	0.524	0.90	0.929
0.35	0.566	1.00	1.000

a) Determine the minimum power stage and the total number of equilibrium stages.

b) Calculate (L/D)_min

c) Calculate Nmin at full reflux.

d) Design a plate for the zone of (see zone value below), if the surface tension of the liquid is 35 dynes/cm and the density of the liquid is 785 kg/m³. Average temperature in the rectification zone it is 74 C.