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Mass Transfer
Mass Transfer Operations
GATE 2010
Medium

Water is used to absorb ammonia from a gas mixture in a single separation stage contactor. V=2mol/s gas in with y0=0.1; L=1mol/s liquid in with x0=0. The equilibrium relation between y and x is y*=x. If the stage is ideal, then the value of y is

  • 1/15
  • B1/10
  • C2/15
  • D1/6

Explanation

Mass balance: V·y0+L·x0=V·y+L·x ⟹ 2(0.1)+0=2y+x ⟹ 0.2=2y+x. Ideal stage: y=x (equilibrium). Substituting: 0.2=2y+y=3y ⟹ y=0.2/3=1/15.

Source: GATE CH 2010 (2010)

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