The oil must undergo many changes to be exploitable in the context of a specific use. These transformations involve multiple energy consumption, little known today (no doubt the oil industry have information on this issue). In the end, the multitude of products can be used in various ways (fuel, fuel, petrochemical, plastics, etc.)..
These byproducts are sometimes directly recyclable (gasoline, diesel, etc.). sometimes they will suffer from further processing to be usable, some are even-products, which have no real opportunities.
The tendency is to a maximum value of by-products, and the proportion of products derived is relatively fixed, Indutries oil must seek additional outlets for products produced in over-quantity. For example, the French fleet dieselisation pushes the quantities of products for which we must be sure the application or to find new markets.
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