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| CFC-11 | |
|---|---|
| Name | Trichlorofluoromethane |
| Other names | R-11; Freon-11 |
| Formula | CCl3F |
| Molar mass | 137.37 g/mol |
| CAS number | 75-69-4 |
| Appearance | Colorless gas or liquid |
| Density | 1.49 g/cm3 (liquid) |
| Boiling point | 23.7 °C |
| Melting point | −111.5 °C |
| Solubility | Low in water; soluble in organic solvents |
CFC-11 is a chlorofluorocarbon historically used as a refrigerant and aerosol propellant that became notorious for its role in stratospheric ozone depletion. Developed in the early 20th century and commercialized by chemical firms, CFC-11 was widely deployed in refrigeration, foam blowing, and solvents before international environmental agreements mandated its phase-out. Scientific studies linked CFC-11 emissions to Antarctic ozone thinning, prompting global policy responses and research into atmospheric transport, chemical kinetics, and replacement compounds.
Trichlorofluoromethane is a haloalkane with the molecular formula CCl3F and a systematic name reflecting halomethane structure; authoritative catalogs such as those from American Chemical Society, Royal Society of Chemistry, National Institute of Standards and Technology and Sigma-Aldrich list its physical constants and hazard classifications. The compound exists as a colorless, nonflammable gas at ambient temperature that can be liquefied under modest pressure; product datasheets from DuPont, Honeywell, Olin Corporation and regulatory dossiers describe boiling point, vapor pressure, and critical temperature relevant to refrigeration cycles used by Carrier Corporation, Trane Technologies, Emerson Electric and Johnson Controls. Spectroscopic signatures used in laboratory and remote sensing—infrared, mass spectrometry, and gas chromatography—are cataloged by NASA, European Space Agency, NOAA and academic groups at MIT, Caltech, University of Cambridge and ETH Zurich, enabling detection in atmospheric samples and industrial streams.
Industrial synthesis pathways were developed by chemical companies in the early and mid-20th century and scaled by firms such as DuPont, ICI, BASF, Dow Chemical Company and Union Carbide for use in commercial refrigeration, foam manufacture, solvent cleaning, and aerosol propellants. Widespread application in domestic refrigerators, commercial chillers, and polyurethane foam insulation connected CFC-11 supply chains to manufacturers like Whirlpool Corporation, GE Appliances, ArcelorMittal (building materials), and construction projects led by firms such as Skanska and Bechtel, while aviation and automotive cooling systems incorporated formulations specified by Boeing, Airbus, General Motors and Ford Motor Company. Consumption trends documented by trade organizations including International Institute of Refrigeration, World Bank reports, and market analyses from Bloomberg and IHS Markit show postwar growth followed by regulatory-driven contraction in the late 20th century.
Photochemical degradation of trichlorofluoromethane in the stratosphere releases chlorine atoms that catalyze ozone destruction, a mechanism elucidated by researchers working at University of Cambridge, University of Colorado Boulder, Harvard University, Scripps Institution of Oceanography and National Center for Atmospheric Research; foundational studies cited work by Sherwood Rowland, Mario Molina, Paul Crutzen and observational programs such as British Antarctic Survey, NASA ER-2, NOAA ESRL and European Centre for Medium-Range Weather Forecasts. Chlorine-catalyzed cycles implicated in Antarctic ozone loss were linked to polar stratospheric cloud chemistry investigated by teams at University of Leeds, Karolinska Institutet, Max Planck Institute for Chemistry and ETH Zurich, with landmark measurements from Halley Research Station, South Pole Station, Syowa Station and satellite missions including NASA Aura, ESA Envisat and NOAA TIROS.
CFC-11 is characterized by a long atmospheric lifetime on the order of decades, a global warming potential evaluated in assessments by Intergovernmental Panel on Climate Change, UNEP, IPCC, and WMO, and mobility that links surface emissions to stratospheric perturbations measured by NOAA, ESRL, PICOS, and academic observatories at Mauna Loa Observatory and Jungfraujoch. Environmental impacts encompass ozone layer thinning with consequences for increased ultraviolet-B flux documented in epidemiological and ecological studies by World Health Organization, International Agency for Research on Cancer, UN Environment Programme, UNICEF and universities such as Johns Hopkins University, University of Sydney, University of Cape Town and University of Sao Paulo.
The global phase-out of CFC-11 was negotiated under the Montreal Protocol with amendments and adjustments administered by United Nations Environment Programme, Multilateral Fund, World Bank financing mechanisms and national agencies including US Environmental Protection Agency, European Commission, Environment and Climate Change Canada and Australian Department of Agriculture, Water and the Environment. Regulatory actions accelerated transitions to alternatives promoted by industry groups and manufacturers such as Honeywell, Chemours, Linde plc, Air Products and Chemicals, Mitsubishi Heavy Industries and academic research at Imperial College London, Tsinghua University and Tokyo Institute of Technology into hydrofluorocarbons, hydrochlorofluorocarbons, hydrofluoroolefins and low‑GWP technologies used by Carrier, Daikin, Panasonic and Samsung in refrigeration and by construction firms for insulation; multilateral assessments by IPCC and TEAP evaluated climate trade-offs and policy timelines.
Detection and attribution of residual and illegal emissions of CFC-11 have relied on atmospheric monitoring networks operated by NOAA, AGAGE, IAGOS, ICOS, WMO and satellite retrievals from ESA Copernicus, NASA Aura, JAXA and research campaigns by University of Bristol, MIT, Princeton University and Peking University. Investigations published in journals and presented at conferences hosted by American Geophysical Union, European Geosciences Union and AGU Fall Meeting combined inverse modeling by groups at NCAR, University of Oxford, ETH Zurich and University of Toronto with on‑site audits, customs data analyses from World Customs Organization and collaborative enforcement actions coordinated through Interpol and national regulators to identify sources, with remediation tracked via Montreal Protocol reporting and multilateral compliance reviews.
Category:Chlorofluorocarbons