Loss of gasoline hydrogenation octane number
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What are the reasons for significant loss of gasoline hydrogenation octane number and what are the solutions? It is now Exxon’s process: first, the sulfur in the light fractions is converted, followed by separation of light and heavy components. The light fraction accounts for 0.3% and is sent out directly, while the heavy fraction undergoes selective hydrogenation; as a result, the octane number decreases by about 2–3.5 units
In Axens’ gasoline hydrogenation process, the designed octane number loss should be within 1; your light and heavy gasoline shouldn’t be sent separately, right? It should be that the heavy gasoline is desulfurized via hydrogenation, then mixed with light gasoline in a stripping tower, before being sent out. The octane number of light components should be relatively high.
Also being part of the Axens series, catalytic gasoline has a high olefin content; under the requirements of National Standard V, some of this light gasoline with high olefin levels is transferred to heavy gasoline, where it is saturated in the reactor. While ensuring compliance with sulfur content specifications, efforts are made to produce as much light gasoline as possible, in order to maintain the sulfur conversion rate in the SHU reactor and ensure hydrogen purity
The light fractions are already quite large; more than 0.3 has been extracted, with the sulfur content remaining above 10 ppm
You can ask Axens about this question.