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By-product refers to A substance that modifies at the same time because the primary or wanted product during a chemical reaction. It is typically of secondary economic importance to the major product although lot of industrial by-products have substantial economic value and profitable use in their own right. Petroleum is one of the oil-cracking result, which considers as the by-product. Many other by- products are also have a good valued in business such as paraffin, lubricating oils and other distillates product. Moreover, even, in some situations, the by-products can be superior to the main product in commercial value, such as the extraction of gold from porphyry deposits.
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