Discussion
Consider the following statements about adsorption:
1. Breakthrough occurs before the bed is fully saturated.
2. High humidity reduces working capacity.
3. Beds are regenerated with cold air.
Which of the statements given above is or are correct?
Answer: C
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: breakthrough precedes saturation because the mass transfer zone has finite depth, and humidity competes for sites. Statement 3 is wrong. Regeneration requires energy to drive the adsorbate off - low pressure steam is the usual agent, sometimes hot inert gas or a vacuum - and cold air would achieve nothing at all.
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