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CARBON TETRACHLORIDE During 1839 a highly toxic substance was discovered by the name of carbon tetrachloride. Created by the reaction of chlorine with chloroform, carbon tetrachloride is manufactured when chlorine and methane or chlorine and carbon disulfide react. The process including methane became the prominent way of production in the United States during the 1950's, but the process dealing with carbon disulfide remained important to countries in which natural gases were not abundant. Because of its excellent solvent properties and non-flammability, carbon tetrachloride has been in use for many decades in certain products such as grease solvents, dry cleaning solvents, and fire extinguishing agents. Also it has been used to catalyze ozone depleting CFC's, chlorofluorocarbons, such as dichlorodifluoromethane (F-12) and trichlorofluoromethane (F-l l), primarily used as refrigerants (freon). Carbon tetrachloride contributes both to ozone depletion and to global warming. Recently it has been utilized by industries as a fumigant...

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