Henry’s law is used to approximate the equilibrium data at the operating temperature. 100 moles of oil entering the absorber contains 8 mol % benzene, 75% of which is to recovered. The steam leaving the absorber contains 3 mol % benzene. The oil is assumed to be nonvolatile. Additionally, it is given that when the oil phase contains 10 mol % benzene, its partial pressure is 5.07 kPa.

1.1. Draw a schematic diagram to represent the process. (2)

1.2. Determine graphically the number of transfer units required. (20)

1.3. Determine the amount of fresh steam required. (3)

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