What causes the decrease in the dry point of refined naphtha?
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This post was last edited by Refiner on 2018-6-15 10:29. The reforming unit separates mixed naphtha into straight-run naphtha and diesel hydrogenation-treated naphtha; the dry point is 180； After hydrogenation refining in the pre-hydrogenation unit, the dry point dropped to 165 – what is the reason for this?
After hydrogenation, the amount of high-boiling substances in the material decreases, and thus the dry point drops.
What are the main high-boiling-point materials?
Personally, I think it should be aromatics, cycloalkanes, and the like – that is, large-molecule hydrocarbons being hydrogenated to form smaller-molecule hydrocarbons
My personal understanding: it’s not hydrocracking; the reaction of hydrorefining has little effect on the boiling range, so the dry point shouldn’t change by so much； If the test analysis data is correct, it is estimated that the reaction in the bed is somewhat intense, with some of the material undergoing cracking.
If the sulfur content of the refined naphtha is within acceptable limits, it is possible to lower the reaction temperature slightly and see if there is any change in your dry point