Petroleum Refinery Engineering
Hydrofining is the most recent and effective method for the

Improvement of smoke point
Removal of sulphur
Reduction of breathing loss
Improvement of viscosity index

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Petroleum Refinery Engineering
Mercaptans are

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

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