Why is the density of tail oil lower than that of diesel?
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Both the initial and final boiling points of the tail oil are higher than those of diesel; why is its density still lower?
What hydrogenation? Shouldn’t it be like this?
The diesel produced is already a finished product, so hydrogenation is not necessary. It has been refined again anyway
It is likely related to the composition of the tail oil; the polycyclic aromatic hydrocarbons are not fully hydrogenated and saturated, resulting in a higher initial boiling point and dry point, as well as a lower density