Petroleum Refinery Engineering
Mercaptans are

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

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Petroleum Refinery Engineering
Asphalts are

Readily oxidisable and form carbonaceous sludge
Desirable in catalytic cracking feedstock, because they produce coke
All of these
. Low molecular weight & low boiling point compounds present in petroleum

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