Naphtha discoloration issue
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For fossil naphtha, as the degree of hydrogenation increases, its storage stability decreases; after being stored for one month, its color intensity rises to +11. What is the reason for this?
By deep hydrogenation, what criteria are referred to for hydrogenated gasoline? What are the specific values for indicators such as olefin content, sulfur content, nitrogen content, etc.?
The S content of the naphtha after hydrogenation is 100 ppm; as the degree of hydrogenation increases, this value drops to 40 ppm, while the S content of the raw material is over 1000 ppm.
U23 gasoline antioxidant and anti-gelling agents can be added, which effectively improves the oxidation stability of gasoline and extends its shelf life by 30-40 days; it also prevents oxidation and discoloration even when exposed to direct sunlight for over 7 days
Question: What is the initial distillation cut of naphtha? What counts as normal? How many standards are there for the distillation ranges of naphtha? What are the main components of U23 gasoline antioxidant and anti-gelling agents?
For the hydrogenated naphtha we produce, the target sulfur content limit is 10 ppm
This issue is discussed on page P164 of the book \"Hydrofining\" (edited by Fang Xiangchen). To put it simply, oils contain natural antioxidants; these antioxidants are destroyed after deep hydroprocessing, which results in a decrease in the optical stability of the oils.