Petroleum Refinery Engineering
Iso-octane is used as a reference substance in the definition of octane number and it is assigned an octane number value of 100. Iso-octance is chemically known as

1, 3 butadiene
2-2-4 tri methyl pentane
α-methyl naphthalene
Tetra methyl ethylene

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Petroleum Refinery Engineering
In catalytic cracking, the

Gasoline obtained has a very low octane number
Gasoline obtained has very high aromatic content
Gasoline obtained has very high amount of gum forming compounds
Pressure & temperature is very high

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