Discussion
Assertion (A): Adsorption beds are switched at breakthrough rather than at saturation.
Reason (R): Continuing past breakthrough buys the remaining capacity at the price of an emission.
Select the correct answer from the options below.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason states the trade exactly. Between breakthrough and saturation the bed still has capacity, but every hour of that capacity is bought by emitting pollutant at a rising concentration. Since the whole purpose of the bed is to prevent that emission, it is switched at breakthrough, and the design capacity used is the working capacity up to that point rather than the equilibrium capacity.
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