Petroleum Refinery Engineering
Mercaptans are added to liquefied petroleum gas (LPG) to

Narrow down its explosion limit
Reduce its cost
Increase its calorific value
Assist in checking its leakage from cylinder

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

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

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