In the producing phase what goes differently for diesel and petrol considering that both are produced from crude oil?
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The replies about different hydrocarbons going to different products are generally correct but also keep in mind that apart form the mentioned physical treatment (distillation, or rectification), the separated crude oil fractions also undergo different stages of chemical treatment, the main of which is reforming. This process leads to increase of aromatics in the product which means higher octane rating. At the last stage, different additives are added to different final products as they are supposed to be used in slightly different circumstances.
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