Petroleum Refinery Engineering
Polymerisation

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

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Petroleum Refinery Engineering
Asphalts are

. Low molecular weight & low boiling point compounds present in petroleum
All of these
Readily oxidisable and form carbonaceous sludge
Desirable in catalytic cracking feedstock, because they produce coke

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