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Mass Transfer
Mass Transfer Operations
GATE 2019
Medium

100 kg of feed containing 50 wt% solute C is contacted with 80 kg of solvent containing 0.5 wt% C in a mixer-settler. The resultant extract and raffinate contain 40 wt% and 20 wt% C respectively. If E, R are the masses of extract and raffinate, the ratio E/R is

  • A1/4
  • B1/2
  • 2/3
  • D1

Explanation

Total mass E+R=180kg. C balance: 0.4E+0.2R=100×0.5+80×0.005=50.4. Substituting R=180−E: 0.4E+0.2(180−E)=50.4 ⟹ 0.2E=14.4 ⟹ E=72, R=108. E/R=72/108=2/3.

Source: GATE CH 2019 (2019)

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