Petroleum Refinery Engineering
Hydrocracking employs

Low pressure & temperature
High pressure & temperature
High temperature and low pressure
High pressure and low temperature

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

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

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