Chemical Engineering > GATE 2024 > Absorption
A gas stream containing 95 mol% CO2 and 5 mol% ethanol is to be scrubbed with
pure water in a counter-current, isothermal absorption column to remove ethanol.
The desired composition of ethanol in the exit gas stream is 0.5 mol%.
The equilibrium mole fraction of ethanol in the gas phase, y*, is related to that
in the liquid phase, x, as y* = 2x. Assume CO2 is insoluble in water and neglect
evaporation of water. If the water flow rate is twice the minimum, the mole fraction
of ethanol in the spent water is ______
Correct : d
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