We are extracting acetic acid from water into 3 -heptanol at \(25^{\circ} \mathrm{C}\) in an extraction column with 30 equilibrium stages. Equilibrium is \(y=0.828\) \(\mathrm{x}\), where \(\mathrm{y}\) is weight fraction acetic acid in 3-heptanol and \(\mathrm{x}=\) weight fraction acetic acid in water. The aqueous feed rate is \(500 \mathrm{~kg} / \mathrm{h}\). The feed is \(1.1 \mathrm{wt} \%\) acetic acid, and the exit water should be \(0.037 \mathrm{wt} \%\) acetic acid. Inlet 3-heptanol contains \(0.02 \mathrm{wt} \%\) acetic acid. What solvent flow rate is required? Assume total flow rates are constant.