Petroleum Refinery Engineering
Catalytic cracking compared to thermal cracking of residue of vacuum distillation of crude oil

Higher sulphur content in the product
Lower octane number of petrol
Gives higher yield of petrol
Higher gum forming material in petrol

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Petroleum Refinery Engineering
Alkylation

Converts iso-paraffin into olefin
Causes olefins to combine with iso-paraffins
Causes olefins to combine with each other
Converts olefin into paraffin

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