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Freon was used as the original brand name for electronic gases produced and marketed by DuPont. With the depletion of the ozone layer and the subsequent phase-out of chlorofluorocarbon (CFC) gas compounds, the company rebranded this product line to differentiate from refrigerant gases that had been using the same Freon brand name.
DuPont de Nemours, Inc., commonly shortened to DuPont, is an American multinational chemical company first formed in 1802 by French-American chemist and industrialist Éleuthère Irénée du Pont de Nemours. The company played a major role in the development of the U.S. state of Delaware and first arose as a major supplier of gunpowder.
1-Chloro-1,2,2,2-tetrafluoroethane, C 2 H Cl F 4, is a hydrochlorofluorocarbon used as a component in refrigerants offered as replacements for chlorofluorocarbons. HCFC-124 is also used in gaseous fire suppression systems as a replacement for bromochlorocarbons .
Prominent CFCs included R-11 (trichlorofluoromethane), R-12 (dichlorodifluoromethane), and R-114 (1,2-dichlorotetrafluoroethane). [5] A Halon fire suppression system in a ship's machinery room. Production of CFCs grew strongly through the 1980s, primarily for refrigeration and air conditioning but also for propellants and solvents.
Chlorofluorocarbons (CFCs): when derived from methane and ethane these compounds have the formulae CCl m F 4−m and C 2 Cl m F 6−m, where m is nonzero. Hydro-chlorofluorocarbons (HCFCs): when derived from methane and ethane these compounds have the formula CCl m F n H 4−m−n and C 2 Cl x F y H 6−x−y, where m, n, x, and y are nonzero.
A DuPont-commissioned survey undertaken by ChemRisk stated that DuPont released over 1.7 million pounds of C8, 632,468 pounds of that into the Ohio River system. 394,486 pounds was reported to be buried in unlined landfills and 686,233 pounds was released into the environment via chimneys. [4] The factory was operated by DuPont until 2015.
The nonflammability and nontoxicity of the chlorofluorocarbons CCl 3 F and CCl 2 F 2 attracted industrial attention in the 1920s. General Motors settled on these CFCs as refrigerants and had DuPont produce them via Swarts' method. [39] In 1931, Bancroft and Wherty managed to solve fluorine's explosion problem by diluting it with inert nitrogen ...
Fluorinated ethylene propylene was invented by DuPont and is sold under the brandname Teflon FEP. Other brandnames are Neoflon FEP from Daikin or Dyneon FEP from Dyneon/3M. FEP is very similar in composition to the fluoropolymers PTFE (polytetrafluoroethylene) and PFA (perfluoroalkoxy polymer resin). FEP and PFA both share PTFE's useful ...
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