Octane enhancing

The octane number of gasoline can be increased through several methods. The methods chosen depend on the economics and on the requirements set in the gasoline specifications. The most common methods are described in the following chapters.

Depending on the quality of the crude, and the refinery process, gasoline produced by refineries may not meet the minimum octane requirement. Hence, refiners add octane enhancers. Many types of octane enhancer are commonly used:

Organic:

Non-organic:

Hydrocarbon composition in gasoline has an effect on the antiknock performance. Aromatics, olefins and benzene contribute to the octane number of gasoline, and their concentration is usually limi