The relationship between olefins and octane number
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Dear experts, I would like to ask that, within a certain range, the higher the olefin content, the higher the octane rating. But isn’t the octane rating expressed in terms of isooctane? I’ve never been able to figure out why it’s related to olefins.
In octane rating, isooctane and n-heptane are merely calibration substances; they do not indicate the amount of isooctane present in the oil mixture!
Everyone agrees to assign an octane rating of 100 to octane. It’s similar to the fact that water boils at 100°C under standard atmospheric pressure; it’s just a standard used to measure the octane rating or temperature of other substances
Gasoline is a mixture of hundreds of compounds, and it requires a comprehensive evaluation of its properties. In terms of anti-knock performance (octane rating), the anti-knock properties of isooctane and n-heptane are used as benchmarks for assessment. Various components in gasoline contribute to its anti-knock properties, with alkenes having a higher octane rating compared to saturated hydrocarbons.