Discussion
Consider the following statements about fluidised beds.
1. Temperature is very uniform because of the vigorous solids mixing.
2. The catalyst can be circulated continuously for regeneration.
3. The gas flow pattern approximates plug flow closely.
Answer: B
The first two are correct and are the reasons the arrangement is used. The third is wrong, since gas bypassing in bubbles makes the contacting much poorer than in a fixed bed. Attrition of the particles is the other cost.
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