Question

Mass transfer zone in fixed bed adsorber is

• A. The portion of the bed with constant adsorbate concentration
• B. The portion of the bed saturated with adsorbate
• C. The portion of the bed in which concentration changes from feed concentration to zero
• D. The zone that follows the unused bed and saturated bed

Hint:

In fixed bed adsorption, the mass transfer zone represents the region where solute is being adsorbed, and the concentration gradient occurs between the feed and the adsorbent.

Answer 1

The Correct Option is C

- The mass transfer zone is the region in the bed where the concentration of adsorbate changes from the feed concentration to zero. 
- This zone moves as the adsorbate is transferred and adsorbed onto the solid phase of the be(D) 
Conclusion: 
The mass transfer zone in the fixed bed adsorber is the portion of the bed where the concentration changes from feed concentration to zero, as given by option (C).