A relatively nonvolatile hydrocarbon oil contains 4.0 mol % propane and is being stipped by pure superheated steam in a stipping tray tower to reduce the propane content to 0.2 %. The temperature is held constsnt at 422 K by internal heating in the tower at 2.026 x 105 Pa pressure. A total of 11.42 kg mol of direct steam is used for 300 kg mol of total entering liquid. The vapor-liquid equilibria can be represented by y=25x, where y is mole fraction propane in the steam and x is mole fraction propane in the oil. Steam can be considered as an inert gas and will not condense.

a. Plot the operating and equilibrium line.

b. Using plot, determine the number of theoritical tray needed.

c. Use the analythical Kremser equation with the geometric average A, calculate the number of theoritical trays.

d. Atleast howmany trays are needed for this system to do the separation