Two-stage regeneration problem
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Why does the regenerator in catalytic cracking require two stages of regeneration – one stage to burn off 65% of the carbon and another stage to burn off the remaining 35%? Can’t it be done in just one stage? Are there some devices that also have only one regenerator? Is there any difference between these two? Which one is better?
The regeneration processes vary. Some of these processes differ significantly, requiring regeneration under two different conditions; therefore, some processes involve only one stage while others involve two stages.
In the first stage, most of the hydrogen is burned; this is a wet combustion process, and excessively high temperatures can deactivate the catalyst. The second stage allows for the burning of the remaining carbon, ensuring complete combustion.