9.19 An aniline-water solution containing 7wt% aniline, at the bubble point, is to be steam-stripped at a rate of 1000kg/h in a tower packed with 38mm(1.5-in) Berl saddles with open steam to remove 99% of the aniline. The condensed overhead vapor will be decanted at 98.5C, and the water-rich layer returned to the column. The aniline-rich layer will be withdrawn as distillate product. The steam rate will be 1.3 times the minimum. Design the tower for a pressure drop of 400 (N/m2)/m at the top. Note: For concentrations where the equilibrium curve is nearly straight, it should be possible to use overall numbers and heights of transfer units. Ans.: 6.5m of packing. Data: at 98.5C, the solubility of aniline in water is 7.02 and 89.90wt% aniline. The vapor-liquid equilibria at 745mmHg, at which pressure the tower will be operated, are [Griswold et al., Ind. Eng. Chem., 32, 878 (1940)]: 9.19 An aniline-water solution containing 7wt% aniline, at the bubble point, is to be steam-stripped at a rate of 1000kg/h in a tower packed with 38mm(1.5-in) Berl saddles with open steam to remove 99% of the aniline. The condensed overhead vapor will be decanted at 98.5C, and the water-rich layer returned to the column. The aniline-rich layer will be withdrawn as distillate product. The steam rate will be 1.3 times the minimum. Design the tower for a pressure drop of 400 (N/m2)/m at the top. Note: For concentrations where the equilibrium curve is nearly straight, it should be possible to use overall numbers and heights of transfer units. Ans.: 6.5m of packing. Data: at 98.5C, the solubility of aniline in water is 7.02 and 89.90wt% aniline. The vapor-liquid equilibria at 745mmHg, at which pressure the tower will be operated, are [Griswold et al., Ind. Eng. Chem., 32, 878 (1940)]