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A counter-current extraction column is designed to remove 99% of solute C from a solution of solvent A and solute C using pure solvent B. The initial concentration of solute in the solution  of A + C is 20 wt%, and the total flow of solution is 1000 kg/h. If the equilibrium relationship is Y = 2X , where Y = mass of C/mass of A and X = mass of C/mass of B.

The minimum flow rate of solvent B required (in kg/h) is

  1. 1454
  2. 1584
  3. 1676
  4. 1874
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