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

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

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

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

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