Petroleum Refinery Engineering
Presence of predominantly large quantity of aromatics (polynuclear) is not desirable in aviation fuel, because it has

High pour point and low smoke point
Low viscosity index
High self-ingnition temperature
All of these

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

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

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