Question: Chloroform is to be used to extract benzoic acid from wastewater effluent. The benzoic acid is present at a concentration of 0.05 mol/liter in the

Chloroform is to be used to extract benzoic acid from wastewater effluent. The benzoic acid is present at a concentration of 0.05 mol/liter in the effluent, which is discharged at a rate of 1,000 liter/h. The distribution coefficient for benzoic acid at process conditions is given by

where

c1 = molar concentration of solute in solvent, and cII = molar concentration of solute in water. Chloroform and water may be assumed immiscible. If 500 liters/h of chloroform is to be used, compare the fraction benzoic acid removed in

(a) A single equilibrium contact

(b) Three crosscurrent contacts with equal portions of chloroform

c = K 60 K = 4.2,

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