Ordinary diesel oil is subjected to atmospheric pressure fractionation, and the produced diesel has high sulfur, nitrogen and oxygen content, high olefin content, and discoloration occurs when the vehicle is stationary for a short period of time. If the vehicle is used, it will affect the service life of the vehicle and will have a considerable impact on the atmosphere. Pollution.
The hydrogenated diesel has low sulfur, nitrogen, oxygen and olefin content, good stability, long-term preservation and environmental protection requirements. Some hydrotreaters have a small amount of cracking agent that can affect the freezing point of diesel, so that the freezing point of diesel is lowered and the cold filter point is lowered.
The cetane number of coking diesel is generally around 50, the cetane number of Changchai is generally around 45, and the cetane number of diesel is generally around 35.
According to the distribution characteristics of diesel cetane number: straight-run diesel has high alkane content and high cetane number;
Catalytic diesel isoparaffins and olefins are higher than straight-run diesel, so the cetane number is lower than straight-run diesel; coking diesel has higher olefin and aromatics content than catalytic diesel, so its cetane number is significantly lower. The catalytically hydrorefined diesel oil has an increased cetane number due to the conversion of the olefin to an alkane and the conversion of the aromatic hydrocarbon to a cycloalkane.
Ordinary diesel has a high sulfur content. Many diesel oils are above 2000 PPM. The sulfur content of hydrogenated diesel can be very low, but it is now 800-1000, and it is blended with other components.