Chlorofluorohydrocarbons CFCs

Chlorinated derivatives of methane include methyl chloride, methylene chloride, chloroform, carbon tetrachloride, and several chlorofluorohydrocarbons (CFCs). We discuss carbon tetrachloride (CT) as a representative example of this group. CT was originally prepared in 1839 and was one of the first organic chemicals to be produced on a large scale by the end of the nineteenth century and beginning of the twentieth century. CT is the most toxic of the chloromethanes and the most unstable on thermal oxidation (Holbrook 2000). 

In the review by Armor [1] a variety of pollutants are discussed with a focus on commercially applied processes using catalysis as a solution. Issues such as the removal of NO.v, SO.v, chlorofluorohydrocarbons (CFC), VOC, carbon monoxide, auto exhaust emission, ozone, nitrous oxide, byproducts from chemicals production, odor control, and toxic gas removal are discussed. In another review Armor [2] discusses specific topics such as monolith technology, new catalytic materials, and specific processes. Additionally, key suggestions for future research effort are given. 

Fig, 2.6 demonstrate that this phenomenon has been occurring every spring since about 1970. It has been attributed to the release of anthropogenic chlorinebearing gases such as chlorofluorohydrocarbons (CFCs) primarily in the northern hemisphere of the Earth. 

In Section 13.2, we will look at the environmental effects caused by synthetic organohahdes known as chlorofluorohydrocarbons (CFCs). 

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