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A mixture of acetone and water is to be separated in a continuous countercurrent extraction by using 1,1,2-trichloroethane. It contains 40wt% acetone and is fed

A mixture of acetone and water is to be separated in a continuous countercurrent extraction by using 1,1,2-trichloroethane. It contains 40wt% acetone and is fed at a rate of 2000lb/hr. The solvent feed is contaminated with 5wt% acetone. Determine the number of stages required to achieve a raffinate concentration of 5wt% (haloalkane-free) acetone if the solvent is fed at a rate that is thrice the minimum

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