Rectification Using a Partially Vaporized Feed. A total feed of 200 mol/h having an overall composition of 42 mol % heptane and 58 mol % ethyl benzene is to be fractionated at 101.3 kPa pressure to give a distillate containing 97 mol % heptane and a bottoms 1286 containing 1.1 mol % heptane. The feed enters the tower partially vaporized so that 40 mol % is liquid and 60 mol % is vapor. Equilibrium data are given in Problem 26.4-2. Calculate the following:

a. Moles per hour distillate and bottoms.

b. Minimum reflux ratio Rm.

c. Minimum steps and theoretical trays at total reflux.

d. Theoretical number of trays required for an operating reflux ratio of 2.5:1.

K	C	Xh	Yh
409.3	136.1	0	0
402.6	129.4	0.08	0.230
392.6	119.4	0.250	0.514
383.8	110.6	0,485	0,730
376.0	102.8	0.790	0.904
371.5	98.3	1.000	1.000