Octafluoropropane

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Octafluoropropane
IUPAC name

Octafluoropropane

Other names

Freon 218
Perfluoropropane
RC 218, PFC 218
R218
Flutec PP30
genetron 218

Identifiers
CAS number 76-19-7 YesY
PubChem 6432
ChemSpider 6192 YesY
UNII CK0N3WH0SR YesY
DrugBank DB00556
KEGG D01738 YesY
ChEBI CHEBI:31980 N
ChEMBL CHEMBL1663 YesY
RTECS number TZ5255000
Jmol-3D images Image 1
Properties
Molecular formula C3F8
Molar mass 188.02 g/mol
Appearance Colorless gas with
faintly sweet odor
Density 8.17 g/l, gas
Melting point -183 °C (90.15 K)
Boiling point -36.7 °C (236.45 K)
Structure
Dipole moment 0.014 D
Hazards
MSDS External MSDS
R/S statement R: ?
S: ?
Main hazards Suffocation
NFPA 704
0
1
0
Flash point N/A
Related compounds
Related halocarbons Tetrafluoromethane
Hexafluoroethane
Related compounds Propane
Supplementary data page
Structure and
properties 		n, εr, etc.
Thermodynamic
data 		Phase behaviour
Solid, liquid, gas
Spectral data UV, IR, NMR, MS
 N (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Octafluoropropane (C3F8) is a fluorocarbon non-flammable greenhouse gas that can be produced either by electrochemical fluorination or by the Fowler process using cobalt fluoride.[1]

Applications

In the electronics industry, octafluoropropane is mixed with oxygen and used as a plasma etching material for SiO2 layers in semiconductor applications, as oxides are selectively etched versus their metal substrates.[2]

In medicine, octafluoropropane may compose the gas cores of microbubble contrast agents used in contrast-enhanced ultrasound. Octafluoropropane microbubbles reflects sound waves well and are used to improve the ultrasound signal backscatter. It is also used in pars plana vitrectomy procedures where a retina hole or tear is repaired. The gas acts to provide a long-term tamponade, or plug, of a retinal hole/tear and allows re-attachment of the retina to occur over the following several days post-op.

Under the name R-218, octafluoropropane is used in other industries as a component of refrigeration mixtures.

It has featured in some plans for terraforming Mars.[3]

It is the active liquid in both the PICASSO and COUPP dark matter bubble detectors.

Liquid phase

  • Liquid density (1.013 bar at boiling point) : 1601 kg/m³
  • Liquid/gas equivalent (1.013 bar and 15 °C (59 °F)) : 196 vol/vol
  • Latent heat of vaporization (1.013 bar at boiling point) : 104.25 kJ/kg [4]

Gaseous phase

  • Gas density (1.013 bar at boiling point) : 10.3 kg/m³
  • Gas density (1.013 bar and 15 °C (59 °F)) : 8.17 kg/m³
  • Compressibility Factor (Z) (1.013 bar and 15 °C (59 °F)) : 0.975
  • Specific gravity (air = 1) (1.013 bar and 21 °C (70 °F)) : 6.683
  • Specific volume (1.013 bar and 21 °C (70 °F)) : 0.125 m³/kg
  • Viscosity (1.013 bar and 0 °C (32 °F)) : 0.000125 Poise
  • Thermal conductivity (1.013 bar and 0 °C (32 °F)) : 12.728 mW/(m·K)
  • Thermal Conductivity, Gas @ 101.325 kPa and 25 °C: 13.8 mW/(m·K)
  • Vapour Pressure @ 21.1 °C: 792 kPa [4]

Major hazards

References

  1. ↑ R. D. Fowler, W. B. Buford III, J. M. Hamilton, Jr., R. G .Sweet, C. E. Weber, J. S. Kasper, and I. Litant (1947). "Synthesis of Fluorocarbons". Ind. Eng. Chem. 39 (3): 292–298. doi:10.1021/ie50447a612. 
  2. ↑ Coburn, J. W. (1982). "Plasma-assisted etching". Plasma Chemistry and Plasma Processing 2 (1): 1–41. doi:10.1007/BF00566856. 
  3. ↑ D. Rogers (17–21 October 2005). "Studies in the Future of Experimental Terraforming". 56th International Astronautical Congress of the International Astronautical Federation. Fukuoka, Japan: International Academy of Astronautics, and the International Institute of Space Law. 
  4. ↑ 4.0 4.1 "Encyclopédie des gaz". air liquide. 

External links

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