Petroleum Refinery Engineering
In a refinery petroleum crude is fractionated into gas fraction, light ends, intermediate distillates, heavy distillates, residues and by products. The group of products including gas oil, diesel oil and heavy fuel oil belongs to the fraction

Light ends
Heavy distillates
Residues
Intermediate distillates

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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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