Catalytic device
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This post was last edited by h*ng on 2017-9-30 23:12. If the dirty oil from the light-dirty oil tanks in the plant enters the catalytic unit for reprocessing. Is it suitable as a reaction terminator, or as a feedstock for catalytic mixing? What issues should be paid attention to separately? Thank you very much!
The key is to determine whether the composition of the contaminated oil can be clearly identified. If it can be identified, such as in the case of substandard gasoline or diesel, it is recommended not to reprocess it but to send it directly to the distillation tower; it would be appropriate to feed it into the distillation tower through the return line from the intermediate stage. If the composition of the contaminated oil cannot be determined with certainty, feeding it directly into a distillation column may affect the quality of gasoline or diesel products; in such cases, it is recommended to use a riser for reprocessing. There are various methods available, and using an inhibitor is just one of them. The oil can also be mixed with the raw material for reprocessing, or it can be reprocessed below the nozzle of the feed oil (similar to MGD or LTAG). If there are two lift pipes, they can be used as the feed for the gasoline lift pipe. When reprocessing contaminated oil, it is important to note that regardless of the method used, it is best to avoid any water content; the presence of water in the contaminated oil can have a significant impact on the catalytic cracking process.
We generally deal with terminators. For unqualified gasoline from the startup period, it is possible to consider sending it through a cold reflux line into the distillation tower for processing
Indeed, if it is merely a physical separation of components, it is best to send them to a fractional distillation tower; whereas for other types of heavy oil substances, it is better to mix them with the feedstock before feeding them into a riser for reaction!