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Mass Transfer

Q1: In gas-liquid contact operation, the number of ideal stages,  . This is true when the stripping factor 'S' is

A S > 1

B S < 1

C S = 1

D S = ∞

ANS:A - S > 1

In gas-liquid contact operations, such as distillation or absorption, the number of ideal stages required for separation depends on the stripping factor 𝑆S. The stripping factor represents the ratio of the liquid flow rate in the stripping section to the minimum liquid flow rate required for stripping. It is defined as: 𝑆=𝐿𝐿minS=Lmin​L​ Where:

  • 𝐿L is the actual liquid flow rate in the stripping section.
  • 𝐿minLmin​ is the minimum liquid flow rate required for stripping.
The number of ideal stages required for separation increases as the stripping factor increases. Therefore, the statement "This is true when the stripping factor 'S' is" should be completed as follows:
  • If 𝑆>1S>1, indicating that the actual liquid flow rate is greater than the minimum required for stripping, then the number of ideal stages required for separation increases.
  • If 𝑆<1S<1, indicating that the actual liquid flow rate is less than the minimum required for stripping, then the number of ideal stages required for separation decreases.
  • If 𝑆=1S=1, indicating that the actual liquid flow rate is equal to the minimum required for stripping, then the number of ideal stages required for separation remains constant.
  • If 𝑆=∞S=∞, indicating an infinitely high actual liquid flow rate, then the number of ideal stages required for separation theoretically approaches zero, as there would be effectively no resistance to mass transfer in the stripping section.
So, the correct answer is: 𝑆>1S>1.



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