“chlorofluorocarbon”的概念、定义、翻译、参考文献-科学参考

chlorofluorocarbon

Chemistry

A type of compound in which some or all of the hydrogen atoms of a hydrocarbon (usually an alkane) have been replaced by chlorine and fluorine atoms. Most chlorofluorocarbons are chemically unreactive and are stable at high temperatures. They are used as aerosol propellants, refrigerants, and solvents, and in the manufacture of rigid packaging foam. A commonly encountered commercial name for these compounds is freon, e.g. freon 12 is dichlorodifluoromethane (CCl₂F₂). Chlorofluorocarbons, because of their chemical inertness, can diffuse unchanged into the upper atmosphere. Here, photochemical reactions cause them to break down and react with ozone (see ozone layer). For this reason, their use has been discouraged.

Chemical Engineering

A substance, usually an alkane, in which all the hydrogen atoms have been replaced with chlorine and fluorine atoms. Developed for use as refrigerants, aerosol propellants, solvents, and in the manufacture of foam packaging materials, they are chemically inert and unreactive. However, because of these qualities, they are known to diffuse into the upper atmosphere where photochemical reactions result in the reaction with the protective ozone layer of the Earth. Their manufacture and use has therefore been discouraged beginning with the Montreal Protocol in 1987.

单词	chlorofluorocarbon
释义	chlorofluorocarbon Chemistry A type of compound in which some or all of the hydrogen atoms of a hydrocarbon (usually an alkane) have been replaced by chlorine and fluorine atoms. Most chlorofluorocarbons are chemically unreactive and are stable at high temperatures. They are used as aerosol propellants, refrigerants, and solvents, and in the manufacture of rigid packaging foam. A commonly encountered commercial name for these compounds is freon, e.g. freon 12 is dichlorodifluoromethane (CCl₂F₂). Chlorofluorocarbons, because of their chemical inertness, can diffuse unchanged into the upper atmosphere. Here, photochemical reactions cause them to break down and react with ozone (see ozone layer). For this reason, their use has been discouraged. Chemical Engineering A substance, usually an alkane, in which all the hydrogen atoms have been replaced with chlorine and fluorine atoms. Developed for use as refrigerants, aerosol propellants, solvents, and in the manufacture of foam packaging materials, they are chemically inert and unreactive. However, because of these qualities, they are known to diffuse into the upper atmosphere where photochemical reactions result in the reaction with the protective ozone layer of the Earth. Their manufacture and use has therefore been discouraged beginning with the Montreal Protocol in 1987.
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