Jet fuel hydrogenation process parameters
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The process sheet specifies that the initial boiling point of the hydroprocessed jet fuel feedstock should be ≤205°C, with a final boiling point of ≤298°C. For the hydroprocessed jet fuel product that is produced, the requirements are an initial boiling point of ≤205°C and a final boiling point of ≤300°C. What’s unclear is that the final boiling points of the raw materials are all below 298°C; then how can there be components in the refined aviation fuel whose final boiling point is ≥300°C?
Jet fuel undergoes hydrogenation and distillation to separate out the light components; the heavy components have a high proportion in the refined jet fuel and a slow vaporization rate, which leads to the phenomenon mentioned by LZ.
But this is the final boiling point; it shouldn’t have anything to do with speed, right? 、
If it is said that the 10% or 50% fractions, as you mentioned, undergo hydrorefining and distillation, resulting in an increase in the temperature of the corresponding refined fractions, that is understandable. But isn’t this final boiling point – the final boiling point here and the dry point – referring to the same temperature? If so, will hydrorefining raise the final boiling point of the oil?
My personal opinion is that in my country, the standard for Jet Fuel No. 3 is that its final boiling point must not exceed 300 degrees Celsius; in other words, as long as the final product meets this national standard, it is acceptable. The requirement for the raw material is <298°C; this is a method of controlling the raw material in order to ensure that the final boiling point of the product remains below 300°C.