\(10.0 \mathrm{kmol} / \mathrm{h}\) of a saturated vapor feed that is \(23.5 \mathrm{~mol} \%\) water with the remainder nitromethane is sent to an enricher that is packed with 1.524 \(\mathrm{m}\) of packing. \(\mathrm{L} / \mathrm{V}=0.8\). The overhead vapor from the column is condensed and sent to a liquid-liquid settler. The water-rich layer is the distillate product \(\mathrm{x}_{\mathrm{D}}=\mathrm{x} \beta=91.4 \mathrm{~mol} \%\) water. The nitromethane-rich layer from the settler is refluxed to the column. Find HETP in feet and water mole fraction in bottoms. Water-nitromethane data are given in Table 8-8 in Problem 8.D16.

Problem 8.D16.

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D16. Nitromethane and water are separated in a rectifying column system with a total condenser and a liquid-liquid settler similar to Figure 8- 3A, except the column is a rectifying column. The saturated vapor feed is 7.5 mol% water. The water product from the settler is 91.4 mol% water. The organic phase refluxed to the column is 31.2 mol% water. Pressure = 1.0 atm, feed rate = 50.0 kmol/h, and CMO is valid. The desired bottoms is 2.5 mol% water. Find: Xdist,water, reflux ratio L/D, D, B, and the number of equilibrium stages. Equilibrium data are in Table 8-8. Density data are given after the table, and be sure to read the note on safety at the end of this problem. TABLE 8-8. Water-nitromethane equilibrium data at 1.0 atm Liquid Vapor Liquid Vapor 7.9 34.0 81.4 50.1 16.2 45.0 88.0 50.2 23.2 49.7 91.4 50.3 31.2 50.0 92.5 51.3 39.2 50.2 93.5 52.9 45.0 50.2 95.1 55.9 55.2 50.2 95.9 57.5 63.8 50.2 97.5 65.8 73.0 50.2 97.8 68.4 77.0 50.2 98.6 79.2 Data: Density of nitromethane at 25C is 1129 kg/m. Safety note: Nitromethane (also called methyl nitrate, CH3NO2) is dangerous. If you try to freeze the pure compound, it explodes. Feed V L Water Phase Organic Phase Dry Organic A