Answer only Problem 12.10-1, using analytical method (material balance and Kremser Equation). Thank you!

12.10-1. Constant Underflow in Leaching Oil from Meal. Use the same conditions as given in Example 12.10-1, but assume constant underflow of N = 1.85 kg solid/kg solution. Calculate the exit flows and compositions and the number of stages required. Com- pare with Example 12.10-1. 0.111, XA1 0.623, 4.3 stages Ans. YAN EXAMPLE 12.10-1. Countercurrent Leaching of Oil from Meal A continuous countercurrent multistage system is to be used to leach oil from meal by benzene solvent (B3). The process is to treat 2000 kg/h of inert solid meal (B) containing 800 kg oil (A) and also 50 kg benzene (C). The inlet flow per hour of fresh solvent mixture contains 1310 kg benzene and 20 kg oil. The leached solids are to contain 120 kg oil. Settling experiments similar to those in the actual extractor show that the solution retained depends upon the concentra- tion of oil in the solution. The data (B3) are tabulated below as. N kg inert solid B/kg solution and ya kg oil A/kg solution: N YA N YA 0 0.4 2.00 1.98 0.1 0.5 1.82 1.75 1.68 1.61 0.2 1.94 1.89 0.6 0.7 0.3 Calculate the amounts and concentrations of the stream leaving the process and the number of stages required