1. Water-dioxane solution form a minimum-boiling azeotrope at atmospheric pressure and cannot be separated by ordinary distillation methods. Benzene forms no azeotrope with dioxane and can be used as an extraction solvent. At 25C, the equilibrium distribution of dioxane between water and benzene is as follows: At these concentrations water and benzene are substantially insoluble, and 580kg/hr of a 24.8% dioxane75.2% water solution is to be extracted with benzene to remove 96% of the dioxane. The benzene is dioxanefree. (a) What is the minimum solvent rate? (b) How many stages are required for a countercurrent extraction if the solvent rate is 1.6 times the minimum? Solve using (b.1) McCabe-Thiele method (b.2) Kremser equation (c) Calculate the solvent requirement for a single-stage operation. (d)) Using a packed tower, the height of a transfer unit, Hox is estimated to be 1.2m. Calculate the number of transfer units N0x and the tower height