Chlorotrifluoromethane

Last updated
Chlorotrifluoromethane
Chlorotrifluoromethane-2D.svg
Chlorotrifluoromethane-3D-vdW.png
Names
Preferred IUPAC name
Chloro(trifluoro)methane
Other names
Chlorotrifluoromethane
Monochlorotrifluoromethane
Trifluorochloromethane
Trifluoromethyl chloride
Trifluoromonochlorocarbon
Arcton 3
Freon 13
Genetron 13
R-13
CFC 13
UN 1022
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.000.814 OOjs UI icon edit-ltr-progressive.svg
EC Number
  • 200-894-4
PubChem CID
RTECS number
  • PA6410000
UNII
  • InChI=1S/CClF3/c2-1(3,4)5 Yes check.svgY
    Key: AFYPFACVUDMOHA-UHFFFAOYSA-N Yes check.svgY
  • InChI=1/CClF3/c2-1(3,4)5
    Key: AFYPFACVUDMOHA-UHFFFAOYAV
  • ClC(F)(F)F
Properties
CClF3
Molar mass 104.46 g/mol
AppearanceColorless gas with sweet odor
Density 1.526 g/cm3
Melting point −181 °C (−293.8 °F; 92.1 K)
Boiling point −81.5 °C (−114.7 °F; 191.7 K)
0.009% at 25 °C (77 °F)
Vapor pressure 3.263 MPa at 21 °C (70 °F)
Thermal conductivity 0.01217 W m−1 K−1 (300 K) [1]
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
Ozone depletor and asphyxiant
Flash point Non-flammable
Safety data sheet (SDS) ICSC 0420
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Chlorotrifluoromethane, R-13, CFC-13, or Freon 13, is a non-flammable, non-corrosive, nontoxic chlorofluorocarbon (CFC) and also a mixed halomethane. It is a man-made substance used primarily as a refrigerant. When released into the environment, CFC-13 has a high ozone depletion potential, and long atmospheric lifetime. [2] Only a few other greenhouse gases surpass CFC-13 in global warming potential (GWP). [3] : 2  The IPCC AR5 reported that CFC-13's atmospheric lifetime was 640 years. [4]

Contents

Production

CFC-13—like all chlorofluorocarbon compounds—contains atoms of carbon (C), chlorine (Cl), and fluorine (F). [5] [6]

It can be prepared by reacting carbon tetrachloride with hydrogen fluoride in the presence of a catalytic amount of antimony pentachloride:

CCl4 + 3 HF → CClF3 + 3 HCl

This reaction can also produce trichlorofluoromethane (CCl3F), dichlorodifluoromethane (CCl2F2) and tetrafluoromethane (CF4). [7]

Montreal Protocol

Following the unanimous ratification of the 1987 Montreal Protocol —in response to concerns about the role of concentrations of chlorofluorocarbons (CFCs) in ozone layer-depletion in the stratosphere —a process was put into place to gradually phase out and replace CFC-13 and all the other CFCs. [8] Research in the 1980s said that these man-made CFC compound compounds had opened a hole in ozone layer in the upper atmosphere or stratosphere that protects life on earth from UV radiation. [5]

CFC-13's ozone depletion potential (ODP) is high— 1 [9] (CCl3F = 1)—it is categorized as a Class I in the IPCC's list of ozone-depleting substances. [9] CFC-13's radiative efficiency is high which results in a high global warming potential (GWPs) of 13 900 GWP-100 yr that is "surpassed by very few other greenhouse gases." [3] It is categorized as a Class I in the list of ozone-depleting Substances. [9] : 2 

Increase in atmospheric abundance of CFC-13 in 2010s

Starting in the 2010s, despite a global ban on the production of CFCs, five of these ozone-damaging emissions were on the rise. [5]

The atmospheric abundance of CFC-13 rose from 3.0 parts per trillion (ppt) in year 2010 to 3.3 ppt in year 2020 based on analysis of air samples gathered from sites around the world. [10] Contrary to the Montreal Protocol, the atmospheric emissions of CFC-13 and four other chlorofluorocarbons (CFCs), increased between 2010 and 2020. [11]

As of 2023, the drivers behind the increase in CFC-13 and CFC-112a emissions were not certain. [11]

Physical properties

The IPCC AR5 reported that CFC-13's Atmospheric lifetime was 640 years. [12]

PropertyValue
Density (ρ) at −127.8 °C (liquid)1.603 g⋅cm−3
Density (ρ) at boiling point (gas)6.94 kg⋅m−3
Density (ρ) at 15 °C (gas)4.41 g⋅cm−3
Triple point temperature (Tt)−181 °C (92 K)
Critical temperature (Tc)28.8 °C (302 K)
Critical pressure (pc)3.86 MPa (38.6 bar)
Critical density (ρc)5.5 mol⋅L−1
Latent heat of vaporization at boiling point149.85 kJ⋅kg−1
Specific heat capacity at constant pressure (Cp) at −34.4 °C0.06 kJ⋅mol−1⋅K−1
Specific heat capacity at constant volume (CV) at −34.4 °C0.051 kJ⋅mol−1⋅K−1
Heat capacity ratio (к) at −34.4 °C1.168016
Compressibility Factor (Z) at 15 °C0.9896
Acentric factor (ω)0.17166
Viscosity (η) at 0 °C (gas)13.3 mPa⋅s (0.0133 cP)
Viscosity (η) at 25 °C (gas)14.1 mPa⋅s (0.01440 cP)
Ozone depletion potential (ODP)1 [9] (CCl3F = 1)
Global warming potential (GWP)14,000 [4] (CO2 = 1)
Atmospheric lifetime 640 years [4]

See also

References

  1. ↑ Touloukian, Y.S., Liley, P.E., and Saxena, S.C. Thermophysical properties of matter - the TPRC data series. Volume 3. Thermal conductivity - nonmetallic liquids and gases. Data book. 1970.
  2. ↑ Siegemund, Günter; Schwertfeger, Werner; Feiring, Andrew; Smart, Bruce; Behr, Fred; Vogel, Herward; McKusick, Blaine (2002). "Fluorine Compounds, Organic". Ullmann's Encyclopedia of Industrial Chemistry . Weinheim: Wiley-VCH. doi:10.1002/14356007.a11_349. ISBN   978-3-527-30673-2.
  3. 1 2 Vollmer, Martin; Young, Dickon; Trudinger, Cathy; Mühle, Jens; Henne, Stephan; Rigby, Matt; Park, Sunyoung; Li, Shihong; Guillevic, Myriam; Mitrevski, Blagoj; Harth, Christina; Miller, Benjamin; Reimann, Stefan; Yao, Bo; Steele, L.; Wyss, Simon; Lunder, Chris; Arduini, Jgor; McCulloch, Archie; Simmonds, Peter (October 10, 2017). "Atmospheric histories and emissions of chlorofluorocarbons CFC-13 (CClF3), CFC-114 (C2Cl2F4), and CFC-115 (C2ClF5)". Atmospheric Chemistry and Physics Discussions . 2017 (39). doi: 10.5194/acp-2017-935 . hdl: 1721.1/116270 .
  4. 1 2 3 "Chapter 8". AR5 Climate Change 2013: The Physical Science Basis. p. 731.
  5. 1 2 3 Ashworth, James (April 3, 2023). "Mystery emissions of ozone-damaging gases are fuelling climate change". Natural History Museum. Retrieved April 3, 2023.
  6. ↑ Elkins, James.W. (2013). "Halocarbons and other Atmospheric Trace Species". NOAA Global Monitoring Laboratory (Press release). Retrieved April 3, 2023– via US Department of Commerce and NOAA.
  7. ↑ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 304. ISBN   978-0-08-037941-8.
  8. ↑ Allen, Kate (April 3, 2023). "Remember ozone-destroying CFCs? They're on the rise again. And the source is a mystery". The Star. Retrieved April 3, 2023.
  9. 1 2 3 4 "Class I Ozone-depleting Substances". Science - Ozone Layer Protection. US EPA. 2007. Archived from the original on 2010-12-10. Retrieved 2010-12-16.
  10. ↑ "AGAGE Data and Figures". Massachusetts Institute of Technology. Retrieved 2021-02-11.
  11. 1 2 Western, Luke M.; Vollmer, Martin K.; Krummel, Paul B.; Adcock, Karina E.; Fraser, Paul J.; Harth, Christina M.; Langenfelds, Ray L.; Montzka, Stephen A.; Mühle, Jens; O’Doherty, Simon; Oram, David E.; Reimann, Stefan; Rigby, Matt; Vimont, Isaac; Weiss, Ray F.; Young, Dickon; Laube, Johannes C. (April 3, 2023). "Global increase of ozone-depleting chlorofluorocarbons from 2010 to 2020". Nature Geoscience. 16 (4): 309–313. Bibcode:2023NatGe..16..309W. doi:10.1038/s41561-023-01147-w. hdl: 1983/9e103fef-e61c-49c7-a1a3-902540ec1d7c . ISSN   1752-0908. S2CID   257941769 . Retrieved April 3, 2023.
  12. ↑ Forster, Piers; Ramaswamy, Venkatachalam; Artaxo, Paulo; Berntsen, Terje; Betts, Richard; Fahey, David W; Haywood, James; Lean, Judith; Lowe, David C; Raga, Graciela; Schulz, Michael; Dorland, Robert Van; Bodeker, G; Etheridge, D; Foukal, P; Fraser, P; Geller, M; Joos, F; Keeling, C D; Keeling, R; Kinne, S; Lassey, K; Oram, D; O’Shaughnessy, K; Ramankutty, N; Reid, G; Rind, D; Rosenlof, K; Sausen, R; Schwarzkopf, D; Solanki, S K; Stenchikov, G; Stuber, N; Takemura, T; Textor, C; Wang, R; Weiss, R; Whorf, T; Nakajima, Teruyuki; Ramanathan, Veerabhadran; Ramaswamy, V; Artaxo, P; Berntsen, T; Betts, R; Fahey, D W; Haywood, J; Lean, J; Lowe, D C; Myhre, G; Nganga, J; Prinn, R; Raga, G; Schulz, M; Dorland, R Van. "Changes in Atmospheric Constituents and in Radiative Forcing". International Panel of Climate Change. AR4 Climate Change 2007: The Physical Science Basis.
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