Recover pyridine from water using chlorobenzene as solvent in a countercurrent extractor. Feed is \(25.9 \mathrm{wt} \%\) pyridine and \(74.1 \mathrm{wt} \%\) water. Solvent is pure chlorobenzene, and solvent flow rate is 1000.0 \(\mathrm{kg} / \mathrm{h}\). Outlet extract is \(26 \mathrm{wt} \%\) pyridine, and outlet raffinate is \(4 \mathrm{wt} \%\) pyridine. Operation is at \(25^{\circ} \mathrm{C}\) and \(1.0 \mathrm{~atm}\). Equilibrium data are in Table 13-5.

a. Find number of equilibrium stages needed.

b. Determine feed flow rate required in \(\mathrm{kg} / \mathrm{h}\). NEATNESS COUNTS!

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TABLE 13-5. Equilibrium data for pyridine, water, chlorobenzene at 25C and 1 atm Extract Phase Raffinate Phase Wt frac pyridine, yp Wt frac water Wt frac pyridine, xp Wt frac water 0 0.0005 0 0.9992 0.1105 0.0067 0.0502 0.9482 0.1895 0.0115 0.1105 0.8871 0.2410 0.0162 0.1890 0.8072 0.2860 0.0225 0.2550 0.7392 0.3155 0.0287 0.3610 0.6205 0.3505 0.0395 0.4495 0.5087 0.4060 0.0640 0.5320 0.3790 0.490 0.132 0.490 0.132