Petroleum Refinery Engineering
Higher boiling fractions like atmospheric residue is distilled under vacuum at low temperature because at high temperature, there is a tendency of the predominance of

Coking
Thermal cracking
Gum formation
Discoloration

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Petroleum Refinery Engineering
Polymerisation

Produces i-octane from cracked gases containing i-butane and butene
Causes aromatics to combine with each other
Causes olefins to combine with each other
Is aimed at producing lubricating oil

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