Petroleum Refinery Engineering
In catalytic cracking, the

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

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Petroleum Refinery Engineering
Asphalts are

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

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