where Ky is the overall mass-transfer coefficient and a is the effective interfacial area available for mass transfer. The required column height H can then be calculated from the following expression:

G pfe dy

McCabe (1993) provide the derivation of the preceding equations. To solve Equation 5.20(4), the design engineer must specify yB and yT and obtain G from the column diameter calculations, y* from the equilibrium relationship, and Kya from engineering correlations. The values for y* for physical absorption are available from Henry's law equation as follows:

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