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Mass Transfer

Q1: Pick out the wrong statement.

A When the concentration difference for the mass transfer becomes zero at the bottom of the gas absorption tower, then the upper end of the operating line touches the equilibrium curve.

B The average distance between the operating line and equilibrium line is large, when the liquid-gas ratio is also large in case of a counter current gas absorption tower.

C The operating line lies above the equilibrium curve in case of a gas desorber.

D With decrease in the liquid flow rate for a fixed gas flow rate, the slope of the operating line decreases, in case of gas absorption process.

ANS:C - The operating line lies above the equilibrium curve in case of a gas desorber.

The wrong statement is: "The operating line lies above the equilibrium curve in case of a gas desorber." In a gas desorber, also known as a stripper or regenerator, the operating line lies below the equilibrium curve. This is because a gas desorber is designed to remove solute components from a liquid phase by contacting it with a gas phase. As the solute is transferred from the liquid phase to the gas phase, the concentration of the solute in the liquid decreases, causing the operating line to move below the equilibrium curve. Therefore, the correct statement should be: "The operating line lies below the equilibrium curve in case of a gas desorber."



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