Catalyst bed caking
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I would like to ask the experts: when removing the catalyst from a diesel hydrogenation unit, it was found that caking occurred in the area of the catalyst bed near the reactor walls, while no caking was observed in the middle of the bed. What could be the reason for this?
It’s quite normal; it’s the same for everyone. The issue with coking.
The catalyst should not be packed in a dense phase; this kind of phenomenon is more likely to occur with catalysts that are packed in a normal manner, meaning that flow deviation tends to occur near the vessel walls
It is likely caused by uneven flow; coking is inevitable, so the key is to assess the degree of coking.
It’s normal; there is a wall effect, so coking occurs easily
Generally, caking tends to occur at the wall of the vessel; if it’s severe, it might be caused by flow deviation!
The impurities in the crude oil must have accumulated in the inlet collector or at that location
Why did you think of starting the reactor? Is there a response in terms of operation, or is it time to replace the catalyst?