Catalytic cracking absorption tower
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Why is the mid-section reflux in the absorber tower of a catalytic cracking unit designed to flow from above downward?
In the middle section of the absorption tower, the reflux is generally of the oil collection tank type with full extraction; the liquid does not reach the lower trays, and the internal reflux for those lower trays must be provided by external reflux. Thus, there is extraction from above and return from below.
Its main purpose is to remove the heat generated during the absorption process, and the flow of the liquid is from top to bottom
The absorption tower operates in counter-current mode, with crude gasoline absorbing the rich gas from top to bottom. Take out the liquid from above, cool it down, and then proceed with absorption. What will happen if there is suction at the bottom and flow back at the top? Well, there’s no liquid at the bottom – how can absorption take place?