Acetone must be absorbed by water in a packed column that has a cross-sectional area of 0.186m2 at 293K and 101.32kPa (1 atm). The incoming gas stream is composed of air and 2.6% by mole of acetone. It is desired to obtain the gas at the exit with 0.5% by mol of acetone. The gas stream is composed of 13.65 kmol/h of (inert) air. The stream of water enters pure with a flow of 45.36 kmol/h. The mass transport coefficient (volumetric) for the gaseous film is 3.78 x 10-2 kg mol/(s m3) and for the liquid film it corresponds to 6.16 x 10-2 kg mol/(s m3). The equilibrium in compositions for mentioned temperature and pressure respects the equation y=1.186 x. a – Justify why, in this case, we can use the method for sizing absorption in packing for dilute gas. b - Using the method for dilute gas, calculate the required height of the packed column using the overall mass transport coefficient written for the gas phase. c – Using the method for dilute gas, calculate the required height of the packed column using the overall mass transport coefficient written for the liquid phase.
Acetone must be absorbed by water in a packed column that has a cross-sectional area of 0.186m2 at 293K and 101.32kPa (1 atm). The incoming gas stream is composed of air and 2.6% by mole of acetone. It is desired to obtain the gas at the exit with 0.5% by mol of acetone. The gas stream is composed of 13.65 kmol/h of (inert) air. The stream of water enters pure with a flow of 45.36 kmol/h. The mass transport coefficient (volumetric) for the gaseous film is 3.78 x 10-2 kg mol/(s m3) and for the liquid film it corresponds to 6.16 x 10-2 kg mol/(s m3). The equilibrium in compositions for mentioned temperature and pressure respects the equation y=1.186 x.
a – Justify why, in this case, we can use the method for sizing absorption in packing for dilute gas.
b - Using the method for dilute gas, calculate the required height of the packed column using the overall mass transport coefficient written for the gas phase.
c – Using the method for dilute gas, calculate the required height of the packed column using the overall mass transport coefficient written for the liquid phase.
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