“by-product”的概念、定义、翻译、参考文献-科学参考

by-product

Chemistry

A compound formed during a chemical reaction at the same time as the main product. Commercially useful by-products are obtained from a number of industrial processes. For example, calcium chloride is a by-product of the Solvay process for making sodium carbonate. Propanone is a by-product in the manufacture of phenol.

Chemical Engineering

A substance that forms at the same time as the main or desired product during a chemical reaction. It is usually of secondary economic significance to the main product although many industrial by-products have significant economic value and commercial use in their own right. The product from the cracking of oil is petroleum. Many other by-products are also formed that have economic value such as paraffin, lubricating oils, and other distillates. In some cases, the revenues from by-products can exceed the main product, such as, the extraction of gold from porphyry (i.e. a coarse-grained type of igneous rock) deposits. Compare co-product.

Geology and Earth Sciences

In mining, subsidiary material worked from ore deposits in which other materials are dominant. In some cases the revenue from the by-products can exceed that from the major type, e.g. gold from porphyry copper deposits. Compare co-product.

Economics

A good produced in the process of the production of some other good. Sale of a by-product makes production more profitable than if it had to be thrown away, or was costly to dispose of. For example, tar and other heavy fractions are the by-products of oil refining for petrol. The term by-product is used where one good (petrol) would be produced for its own sake even if the other (tar) were useless. This is distinguished from joint production, which is profitable only if both goods can be sold.

单词	by-product
释义	by-product Chemistry A compound formed during a chemical reaction at the same time as the main product. Commercially useful by-products are obtained from a number of industrial processes. For example, calcium chloride is a by-product of the Solvay process for making sodium carbonate. Propanone is a by-product in the manufacture of phenol. Chemical Engineering A substance that forms at the same time as the main or desired product during a chemical reaction. It is usually of secondary economic significance to the main product although many industrial by-products have significant economic value and commercial use in their own right. The product from the cracking of oil is petroleum. Many other by-products are also formed that have economic value such as paraffin, lubricating oils, and other distillates. In some cases, the revenues from by-products can exceed the main product, such as, the extraction of gold from porphyry (i.e. a coarse-grained type of igneous rock) deposits. Compare co-product. Geology and Earth Sciences In mining, subsidiary material worked from ore deposits in which other materials are dominant. In some cases the revenue from the by-products can exceed that from the major type, e.g. gold from porphyry copper deposits. Compare co-product. Economics A good produced in the process of the production of some other good. Sale of a by-product makes production more profitable than if it had to be thrown away, or was costly to dispose of. For example, tar and other heavy fractions are the by-products of oil refining for petrol. The term by-product is used where one good (petrol) would be produced for its own sake even if the other (tar) were useless. This is distinguished from joint production, which is profitable only if both goods can be sold.
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