The effects of low olefin content in gasoline are as follows:
Olefins have high octane number sensitivity, so olefins cannot be too low. Moreover, too low olefins in gasoline will increase production. However, when the olefin content is high, the increase in octane number slows down. In other words, olefins are not the only way to increase the octane number. Alkenes are also unstable and prone to oxidative decomposition.
It affects the stability of gasoline and the working condition of the engine, and also causes environmental pollution. Therefore, lower olefin content in gasoline is not better. Of course, higher is not better.
The development history of gasoline:
In the 19th century, people had not yet realized the importance of gasoline. At that time, kerosene was used in large quantities for lighting. At that time, oil refining relied on simple The distillation process separates components with different boiling points in petroleum. The kerosene component has a higher boiling point and is safe to use when lighting lamps. It has become the main product of crude oil refining, while gasoline and other components are often burned as fuel.
In the mid-to-late 19th century, an internal combustion engine using gasoline was successfully created. In 1886, the gasoline engine was successfully used as a car power. As a result, the importance of gasoline increased day by day. However, it could only be extracted from crude oil using the distillation method. 20% gasoline. In 1911, the American Standard Oil Company solved the problem of low gasoline yield.
Using the thermal cracking process invented by William Burton and Robert Hamforth, heavy gas oil is heated and cracked into light gasoline and other fractions, thus increasing the overall gasoline yield and thermal cracking. The cracking process was granted a U.S. patent in 1913. The subsequent catalytic cracking process further improved the gasoline yield and higher octane number than the thermal cracking process.