The current density to remove chromium layer from cell under given conditions should be determined. Concept Introduction: Time required for plating before exposing is calculated by, t = w n F I M Where, w = mass of substance/metal n = charge of metal ions F = Faraday's constant I = current in the cell M = atomic mass of metal

Question

2500 kg/hr of (20-80) nicotine water solution is to be extracted with benzene containing 0.5% nicotine in the 1st and 2ed stages while the 3rd stage is free of nicotine. Cross- current operation is used with different amounts of solvent for each stages 2000kg/hr in the 1st stage, 2300 kg/hr in the 2nd stage, 2600 kg/hr in the 3rd, determine: - a- The final raffinate concentration and % extraction. b- b- The minimum amount of solvent required for counter-current operation if the minimum concentration will be reduced to 5% in the outlet raffinate. Equilibrium data Wt % Nicotine in water Wt % Nicotine in benzene 0 4 16 25 0 4 21 30

Answer 1

Question

Chapter 18, Problem 18.16P

Interpretation Introduction

Interpretation:

The current density to remove chromium layer from cell under given conditions should be determined.

Concept Introduction:

Time required for plating before exposing is calculated by,

t=wnFIM

Where,

w = mass of substance/metal

n = charge of metal ions

F = Faraday's constant

I = current in the cell

M = atomic mass of metal

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