single equilibrium stage

A feed of 13,500 kg/h consists of 8 wt% acetic acid in water. Acetic acid will be removed from the solution by extraction with pure methyl isobutyl ketone at 298 K. If the raffinate is to contain only 1 wt% of acetic acid, estimate the kilograms/hour of solvent required if a single equilibrium stage is used. Assume that water and methyl isobutyl ketone are insoluble. For this system, m’ = 0.657 kg water/kg methyl isobutyl ketone (Perry and Chilton, 1973)