An absorber is used to remove acetone from a nitrogen carrier gas. The feed (str

Question

An absorber is used to remove acetone from a nitrogen carrier gas. The feed (stream 1), with acetone weight fraction of 0.213, enters at a rate of 2 m3/h. The absorbing liquid is water and enters the absorber (stream 2) with a mass flow rate five times more than the feed mass flow rate. The exit gas (stream 3) is 0.8 wt% acetone and 2.9 wt% water vapor. The mass flow rate of stream 3 decreases by 18% compared to feed stream. Assume no N2 goes with liquid.

If the feed composition is ONLY given as mole fraction, how would you proceed in your calculations? Explain.

Explanation / Answer

Given Data:-

Stream 1:

Acetone weight fraction = 0.213

Flow rate q = 2 m3/hr

Then q = 2000 kg/hr

Stream 2:

Absorbing liquid = H2O (Water)

Mass flowrate q = 10 m3/hr

Then q = 10,000 kg/hr

Stream 3:

Acetone weight fraction = 0.8 wt%

Water vapour = 2.9 wt%

Mass flowrate q = Decreases 18%

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