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Mass Transfer - Engineering

Q1:

For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG:mass transfer co-efficient, mols/m2 , a: in-terfacial area per unit volume of tower)

A

B

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D

ANS:A -

The height of a transfer unit (HOG) based on the gas phase for gas absorption can be expressed using the following equation: 𝐻𝑂𝐺=1𝐺⋅𝐹𝐺⋅𝑎HOG​=G⋅FG​⋅a1​ Where:

  • 𝐺G is the superficial molar gas velocity (mole/m²·s),
  • 𝐹𝐺FG​ is the mass transfer coefficient in the gas phase (mole/m²·s),
  • 𝑎a is the interfacial area per unit volume of the tower (m²/m³).
This equation represents the height of the transfer unit required for the gas phase in the absorption process. It quantifies the effectiveness of mass transfer between the gas and liquid phases in the absorber tower.