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Problem 1 - (35 pts) A stream of heavy hydrocarbon oil contains an appreciable amount of propane that we wish to recover. To accomplish that, we plan to use a trayed tower and strip the heavy hydrocarbon oil with steam at 150C and 2 atm. The tower operates isothermally at this temperature necessitating to bring the feed stream to 150C and 2 atm (same for the steam stream). At this temperature and pressure, the oil can be considered to be nonvolatile and the water is insoluble in the oil and remains gas throughout. The inlet liquid flows at 100 kmol/hr (total flow) and is 9.1 mol% propane. You wish to reduce the concentration of propane in the oil to 0.5 mol% propane. The inlet steam stream is pure. Equilibrium data indicate that at 150C and 2 atm, y = 5x (where y and x are mole fractions of propane in the steam and oil, respectively). What is the minimum flowrate of the entering stream of steam required to achieve the desired cleanup, corresponding to an infinite number of stages? (25p) How many ideal stages will be required if the column operates at 1.4 times the minimum gas flowrate? (10p)