Petroleum Refinery Engineering
Antioxidants are added in petrol to

Prevent the lead build up in engines
Impart colour to it, for easy identification
Minimise the gum formation
Prevent icing of the carburettor

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Petroleum Refinery Engineering
In catalytic cracking, the

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

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