High sulfur content in refined diesel
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The diesel hydrotreating capacity is 54 t/h; the temperature at the outlet of the reaction furnace is 338°C, while it’s nearly 400°C at the reactor outlet. Hydrogen recycling is used for desulfurization. The sulfur content in the feed oil (distillate oil, diesel, and sometimes regular diesel) ranges from 8,000 to 15,000 parts per million. The sulfur content in the diesel product is 12 parts per million. When the processing capacity is around 52 t/h, the sulfur content lies between 6 and 9 parts per million; however, if the capacity increases, the sulfur content becomes too high and the product no longer meets the standards. Does anyone know why this happens? Thank you
As far as I know, catalyzed diesel and coker diesel should be processed separately and not blended together, as otherwise it has a significant impact on product quality!
Generally, there are the following situations:
1. High internal leakage at the reaction feed and discharge points; it constitutes a type of leakage, with a small volume, and can be detected through the furfural test
Has the catalyst reached its processing capacity?
Thank you, thank you. Are there any other reasons?
That shouldn’t be the case; the UOP catalysts have only been in use for about two and a half years at most
If the quantity is increased, it becomes substandard: either the catalyst load reaches its limit or the inlet temperature is too low. You’ve mixed in coker gasoline, which makes coking very likely to occur; I’m not sure at which stages of hydrogenation this is being done
This post was last edited by qugd on 2020-5-12 at 14:24. In this case, the processing load has reached its limit due to the desulfurization requirements specified during the booking process. Another possibility is that the catalyst’s activity remains at such a level under these processing conditions. If it’s possible to add an extra stage of hydrogenation to the unit, that might help, but it would cost a lot of money.