Octafluorocyclobutane

  • Peroctafluorcyclobutan
  • RC318
  • Cyclooctafluorbutan
  • Freon C318

Colorless gas with ethereal odor

Gaseous

  • 6.9 kg · m-3
  • 1.639 g · cm -3 at the boiling point of the liquid phase

-41 ° C

-6.4 ° C

269 ​​kPa ( 20 ° C)

Very poor in water ( 140 mg · l -1)

Attention

10300 (in terms of 100 years)

-1542.6 KJ / mol

Template: Infobox chemical / molecular formula search available

Octafluorocyclobutane is a chemical compound selected from the group of organic fluorine compounds.

Production

By full fluorination of cyclobutane with elemental fluorine via radical substitution ( for more details see trichloromethane ) can be produced by this gas:

Properties

Octafluorocyclobutane is a colorless non-flammable gas with ethereal odor, which is slightly soluble in water. Industrially it is delivered in the form of compressed gas cylinders, where it is in liquid form. When flowing the liquid or at the escape of large quantities of gas to cold mists that spread on the ground form. At high concentrations, risk of suffocation. Its critical temperature is 115.32 ° C in bar, the critical pressure at 27,8, the critical density 0.62 kg / l, the triple point temperature of -40.2 ° C, and the triple point pressure at 0.191 bar.

Use

Octafluorocyclobutane is in the semiconductor art as etching and passivating (cf. Reactive Ionentiefenätzen ). Furthermore octafluorocyclobutane is because of its high dielectric strength, this is at atmospheric pressure higher by about 25 % than that used in gas-insulated switchgear (SF6 ), used in high-voltage engineering as insulating.

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