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Solute A is to be absorbed from a binary mixture containing 75 of A with solvent B in a packed tower Based on flooding calculation a tower diameter of 1 2 m is selected Total gas flow rate is

Solute A is to be absorbed from a binary mixture containing 7.5% of A with solvent B in a packed tower. Based on flooding calculation, a tower diameter of 1.2 m is selected. Total gas flow rate is 60 kmol/hr. The exit gas must not contain more than 0.2% of solute A. Solute free liquid B enters from the top of the tower at 40 kmol/hr. The gas phase and liquid phase mass transfer coefficients based on mole ratio unit are: kX =2.05 kmol/m2h (?X) and kY =1.75 kmol/hr.m^2 (?Y). The equilibrium line Equation is Y=0.63X. Specific interfacial area of gas-liquid contact (a) is 71 (m^2)/(m^3). (a) Calculate packing height required for the desired separation. (b) For 99.5% solute A removal, what % increase in packed height is needed? (c) Determine slopes of operating line in each case.

 

Jul 24 2020 View more View Less

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