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

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

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Petroleum Refinery Engineering
Mercaptans are

Added in LPG cylinders to detect gas leakage by its smell
All of these
Undesirable in petrol, as they reduce its octane number
Low boiling sulphur compounds

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