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Dichlorofluoromethane





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DichlorofluoromethaneorFreon 21orR 21 is a halomethaneorhydrochlorofluorocarbon with the formula CHCl2F. It is a colorless and odorless gas. It is produced by fluorination of chloroform using a catalyst such as antimony trifluoride:[4]

Dichlorofluoromethane
Names
Preferred IUPAC name

Dichloro(fluoro)methane

Other names

Dichlorofluoromethane
Fluorodichloromethane
Monofluorodichloromethane
Dichloromonofluoromethane
Freon 21
Refrigerant 21
R 21
HCFC 21
Algofrene Type 5
Arcton 7
Halon 112
UN 1029
Genetron 21

Identifiers

CAS Number

3D model (JSmol)
ChEMBL
ChemSpider
ECHA InfoCard 100.000.791 Edit this at Wikidata
EC Number
  • 200-869-8

PubChem CID
RTECS number
  • PA8400000
UNII
UN number 1029

CompTox Dashboard (EPA)

  • InChI=1S/CHCl2F/c2-1(3)4/h1H checkY

    Key: UMNKXPULIDJLSU-UHFFFAOYSA-N checkY

  • InChI=1/CHCl2F/c2-1(3)4/h1H

    Key: UMNKXPULIDJLSU-UHFFFAOYAU

  • ClC(Cl)F

Properties

Chemical formula

 CHCl2F
Molar mass 102.92 g/mol
Appearance Colorless gas
Odor Ether-like[1]
Density
  • 1.405 kg/m3 at 9 °C
  • 1.366 kg/m3 at 25 °C
    • Melting point −135 °C (−211 °F; 138 K)
    Boiling point 8.92 °C (48.06 °F; 282.07 K)

    Solubility in water

    		 9.420 g/L at 30 °C
    log P 1.55
    Vapor pressure 160 kPa

    Henry's law
    constant     (kH)

    		 0.19 (mol·kg·bar)−1

    Magnetic susceptibility (χ)

    		 −48.8·10−6 cm3/mol
    Thermal conductivity 0.0086 W/m·K (300 K)[2]
    Hazards
    GHS labelling:

    Pictograms

    		 GHS04: Compressed GasGHS07: Exclamation mark

    Signal word

    		 Warning

    Hazard statements

    		 H280, H420

    Precautionary statements

    		 P410+P403, P502
    Flash point Non-flammable[1]

    Autoignition
    temperature

    		 522 °C (972 °F; 795 K)
    Lethal dose or concentration (LD, LC):

    LC50 (median concentration)
    • >800,000 mg/m3 (mouse, 2 hr)
  • 49,900 ppm (rat, 4 hr)[3]

    • LCLo (lowest published)
    • 100,000 ppm (guinea pig, <1 hr)
  • 100,000 ppm (mouse, <1 hr)[3]
    • NIOSH (US health exposure limits):

    PEL (Permissible)

    		 TWA 1000 ppm (4200 mg/m3)[1]

    REL (Recommended)

    		 TWA 10 ppm (40 mg/m3)[1]

    IDLH (Immediate danger)

    		 5000 ppm[1]

    Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

    checkY verify (what is checkY☒N ?)

    Infobox references

    CHCl3 + HF → CHCl2F + HCl

    Uses

    edit

    Dichlorofluoromethane was used as a propellant and refrigerant. Due to its role in ozone depletion, dichlorofluoromethane has been largely phased out. It has ozone depletion potential 0.04. Production and consumption has been since 2004 reduced to 15% of level from 1989 and it is to be phased out in 2015 according to Montreal Protocol.

    Pyrolysis of a mixture of dichlorofluoromethane and chlorofluoromethane gives hexafluorobenzene:[4]

    3 CHCl2F + 3 CH2ClF → C6F6 + 9 HCl

    Additional physical data

    edit

    Its critical point is at 178.5 °C (451.7 K) and 5.17 MPa (51.7 bar). At temperatures from 5 K to 105 K, it has one phase in the space group Pbca.

    Safety

    edit

    Its toxicity is comparable to that of chloroform. Its TLV is 10 ppm.[4]

    References

    edit
    1. ^ a b c d e NIOSH Pocket Guide to Chemical Hazards. "#0197". National Institute for Occupational Safety and Health (NIOSH).
  • ^ 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.
  • ^ a b "Dichloromonofluoromethane". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).
  • ^ a b c Dagani, M. J.; Barda, H. J.; Benya, T. J.; Sanders, D. C. "Bromine Compounds". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a04_405. ISBN 978-3527306732.
    • edit

    Retrieved from "https://en.wikipedia.org/w/index.php?title=Dichlorofluoromethane&oldid=1157145916"
      



    Last edited on 26 May 2023, at 16:49  





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    ●This page was last edited on 26 May 2023, at 16:49 (UTC).
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