Co-products are different products that are unavoidably produced simultaneously with each other. This is similar to the concept of byproducts. However, a byproduct is used when one of the products is considered of lower value and less desirable. Co-products indicates that the products are of similar value and desirability.

Refining is very much a co-product process, as it results in the co-production of a number of high-value products simultaneously, such as gasoline, jet fuel, and diesel fuel.

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