Discussion
A fluidised bed reactor is preferred over a fixed bed when
Answer: A
Correct answer: the catalyst must be circulated continuously
Fluidisation makes the bed behave as a liquid, so catalyst can be drawn off, regenerated and returned continuously - which is exactly what a fluid catalytic cracker needs, its catalyst coking within seconds. The bed also gives excellent heat transfer and a near-uniform temperature. What it gives up is plug flow and mechanical simplicity, and it grinds its own catalyst by attrition.
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