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

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

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Petroleum Refinery Engineering
Mercaptans are

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

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