Petroleum Refinery Engineering
Hydrofining is the most recent and effective method for the

Improvement of viscosity index
Improvement of smoke point
Removal of sulphur
Reduction of breathing loss

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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
High purity products can be obtained thereby
Lighter/low boiling products are prone to thermal decomposition
None of these

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