Petroleum Refinery Engineering
Stabilisation of gasoline (petrol) means

Increasing its vapour pressure
Improving its lead susceptibility
Removal of dissolved gases from it
Increasing its oxidation stability

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Petroleum Refinery Engineering
Crude oil is subjected to vacuum distillation in the last stage, because

None of these
Lighter/low boiling products are prone to thermal decomposition
High purity products can be obtained thereby
High boiling point products like heavy fuel oil & lubricating oils are heat sensitive and may decompose

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