Octafluoropropane

Structural formula
General
Surname	Octafluoropropane
other names	R-218 Perfluoropropane
Molecular formula	C 3 F 8
Brief description	colorless gas with an ethereal odor
External identifiers / databases
CAS number 76-19-7 EC number 200-941-9 ECHA InfoCard 100,000,857 PubChem 6432 DrugBank DB00556 Wikidata Q412659
properties
Molar mass	188.02 g mol −1
Physical state	gaseous
density	8.6524 kg m −3 (0 ° C, 1013 mbar) 1.601 g cm −3 (liquid at boiling point)
Melting point	−183 ° C
boiling point	−36.6 ° C
Vapor pressure	7.67 bar (20 ° C)
solubility	Only slightly soluble in water
safety instructions
GHS labeling of hazardous substances Caution H and P phrases H: 280 P: 403
Global warming potential	9878 (based on 100 years)
Thermodynamic properties
ΔH f 0	−1783.2 kJ / mol
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Octafluoropropane is a chemical compound from the group of aliphatic , saturated halogenated hydrocarbons (PFC) and a representative of the perfluorocarbons .

Extraction and presentation

Octafluoropropane can be produced by electrochemical fluorination or by the Fowler process with cobalt (II) fluoride .

properties

Octafluoropropane is a colorless, non-flammable gas with an ethereal odor. It is heavier than air and is in liquefied form in pressurized gas cylinders . It is also available as a mixture with chlorodifluoromethane or propane . When the liquid flows out or when large amounts of gas escape, cold mists form and spread across the floor. The compound decomposes above 800 ° C. Their critical temperature is 71.9 ° C, the critical pressure is 26.8 bar, the critical density is 0.628 kg / l and the triple point temperature is −148.3 ° C. The global warming potential is 9878 and the ozone depletion potential is 0.

use

Octafluoropropane is used in the electronics industry as a mixture with oxygen for plasma etching of silicon dioxide .

In medicine it is used as a contrast enhancer for ultrasound in cardiology .

As R-218, it is used as a refrigerant in industry.

Web links

• Octafluoropropane (Air Liquide)

Individual evidence

1. ↑ ^{a b c d e f g h i j} Entry for CAS no. 76-19-7 in the GESTIS substance database of the IFA , accessed on July 25, 2011 (JavaScript required)
2. ↑ G. Myhre, D. Shindell et al .: Climate Change 2013: The Physical Science Basis . Working Group I contribution to the IPCC Fifth Assessment Report. Ed .: Intergovernmental Panel on Climate Change . 2013, Chapter 8: Anthropogenic and Natural Radiative Forcing, pp. 24-39; Table 8.SM.16 ( PDF ).
3. ↑ David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Standard Thermodynamic Properties of Chemical Substances, pp. 5-23.
4. ↑ RD Fowler, WB Buford III, JM Hamilton, Jr., RG Sweet, CE Weber, JS Kasper, I. Litant: Synthesis of Fluorocarbons. In: Ind. Eng. Chem. 1947, 39, 3, pp. 292-298, doi : 10.1021 / ie50447a612 .
5. ^ Coburn, JW: Plasma-assisted etching . In: Plasma Chemistry and Plasma Processing . 2, No. 1, 1982, pp. 1-41. doi : 10.1007 / BF00566856 .
6. ^ Matthias Hofer; Sono basic course; ISBN 978-3-13-102915-7