The column in Example 21.12 is operating normally, but a 10% increase in air to be treated,
Question:
The column in Example 21.12 is operating normally, but a 10% increase in air to be treated, to 44 kmol/h, is expected. How can column operation be changed to ensure the desired outlet mole fraction of acetone in air is attained? Be quantitative and assume that only one parameter at a time is manipulated.
Example 21.12
An absorber is designed to be 20 m tall, and it is known that HoV is 4 m. The absorber is designed to treat 40 kmol/h of air containing acetone with a mole fraction of 0.002 and reduce the mole fraction to 0.0001. Pure water is the solvent, at a rate of 20 kmol/h. The column temperature is 26.7°C, and the pressure is 1.2 atm.
Raoult’s law may be assumed to apply, and
It is now observed that the outlet mole fraction of acetone in the air is 0.0002. List as many possible causes of this situation as you can, assuming that only one fault exists at a time. Quantify what is happening in the column for each case, that is, what parameter is off and what is the off-specification value?
Transcribed Image Text:
In P* (atm)
3598.4
T(K)
+10.92
(E21.12a)
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