Discussion
An adsorption bed holds \( 1800 \) kg of carbon with a working capacity of \( 0.12 \) kg of solvent per kg. Treating a stream carrying \( 9 \) kg/h, breakthrough occurs after about
Answer: D
Correct answer: 24 hours
The bed can hold
\[ 1800 \times 0.12 = 216 \text{ kg of solvent} \]and at 9 kg/h that is reached after
\[ \frac{216}{9} = 24 \text{ hours} \]The 216 hours answer mistakes the capacity in kilograms for a time. Note that the working capacity is already less than the equilibrium capacity, since the bed is switched at breakthrough rather than at saturation.
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