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 an inert solid meal (B) containing 800 kg oil (A) and also 50 kg benzene (C). The inlet flow per hour of the fresh solvent mixture contains 1310 kg benzene and 20 kg oil. The leached solids are to contain 120 kg of oil. Settling experiments similar to those in the actual extractor show that the solution retained depends upon the concentration 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: Calculate the number of stages needed. Calculate the amounts and concentrations of the stream leaving the process and the number of stages required. NOTE: The inlet fresh solvent-mixture flow rate per hour is decreased by 10%, to 1179 kg of benzene and 18 kg of oil.
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 an inert solid meal (B) containing 800 kg oil (A) and also 50 kg benzene (C). The inlet flow per hour of the fresh solvent mixture contains 1310 kg benzene and 20 kg oil. The leached solids are to contain 120 kg of oil. Settling experiments similar to those in the actual extractor show that the solution retained depends upon the concentration 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: Calculate the number of stages needed. Calculate the amounts and concentrations of the stream leaving the process and the number of stages required.
NOTE: The inlet fresh solvent-mixture flow rate per hour is decreased by 10%, to 1179 kg of benzene and 18 kg of oil.
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