A bubble-cap tray absorber is designed to absorb 40% of the propane from a rich gas at 4 atm. The specifications for the entering rich gas and absorbent oil are as follows:

(a) Determine the number of equilibrium stages required and the splits of all components. 

(b) Determine the actual number of trays required and the splits and Murphree vapor-tray efficiencies of all components. Discuss and compare the equilibrium-based and rate based results. What do you conclude?

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Flow rate, kmol/s Temperature, °C Pressure, atm Mole fraction: Methane Ethane Propane n-Butane n-Pentane n-Dodecane Absorbent Oil 11.0 32 4 000 0.02 0.05 0.93 Rich Gas 11.0 62 4 0.286 0.157 0.240 0.169 0.148 0