Petroleum Refinery Engineering
Asphalts are

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

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Petroleum Refinery Engineering
The order of preference for feedstock to a catalytic reformer is

Coking naphtha - virgin naphtha - catalytic naphtha
Virgin naphtha - coking naphtha - catalytic naphtha
Virgin naphtha - catalytic naphtha - coking naphtha
Catalytic naphtha - coking naphtha - virgin naphtha

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