Pentafluoroethane

Structural formula
General
Surname	Pentafluoroethane
other names	R-125
Molecular formula	C 2 HF 5
Brief description	colorless gas with a faint ethereal odor
External identifiers / databases
EC number	206-557-8
ECHA InfoCard	100,005,962
PubChem	9633
Wikidata	Q419065
properties
Molar mass	120.02 g mol −1
Physical state	gaseous
density	77 kg m −3 (19 ° C)
Melting point	−103 ° C
boiling point	−48.1 ° C
solubility	very bad in water (430 mg l −1 at 25 ° C)
safety instructions
GHS labeling of hazardous substances Caution
H and P phrases	H: 280
	P: 410 + 403
Global warming potential	3691 (based on 100 years)
Thermodynamic properties
ΔH f 0	−1100.4 kJ / mol
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Pentafluoroethane is a gaseous organic-chemical compound from the group of fluorinated hydrocarbons ( PFCs ).

Extraction and presentation

Pentafluoroethane can be obtained by fluorinating 2,2-dichloro-1,1,1-trifluoroethane with the aid of a catalyst.

{\ displaystyle \ mathrm {Cl_ {2} CH {-} CF_ {3} +2 \ HF \ longrightarrow CF_ {2} H {-} CF_ {3} +2 \ HCl}}

properties

Pentafluoroethane is a non-flammable gas that is heavier than air and therefore collects on the ground. At 0.43 g / l it is only slightly soluble in water. The critical temperature is 66.02 ° C, the critical pressure 36.20 bar and the critical density 4.7658 mol·l ⁻¹ .

use

Pentafluoroethane is used as an extinguishing agent and as a refrigerant .

environment

As a greenhouse gas, pentafluoroethane is around 3700 times stronger than CO ₂ . In contrast to chlorofluorocarbons , however, it is not ozone-damaging . In the Kyoto Protocol it is referred to as a “hydrogen-containing fluorocarbon”, the emission of which must be reduced.

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g Entry on pentafluoroethane in the GESTIS substance database of the IFA , accessed on February 11, 2017(JavaScript required) .
↑ D. Ripple, O. Matar: Viscosity of the saturated liquid phase of six halogenated compounds and three mixtures. In: J. Chem. Eng. Data . Volume 38, 1993, pp. 560-564, doi: 10.1021 / je00012a021 .
↑ 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 ).
↑ 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. 5-21.
^ Y. Higashi: Critical parameters for HFC134a, HFC32 and HFC125. In: Int. J. Refrig. Volume 17, 1994, pp. 524-531.

[GESTIS-1] ↑ ^a ^b ^c ^d ^e ^f ^g Entry on pentafluoroethane in the GESTIS substance database of the IFA , accessed on February 11, 2017(JavaScript required) .

[2] D. Ripple, O. Matar: Viscosity of the saturated liquid phase of six halogenated compounds and three mixtures. In: J. Chem. Eng. Data . Volume 38, 1993, pp. 560-564, doi: 10.1021 / je00012a021 .

[3] 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 ).

[CRC90_5_21-4] 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. 5-21.

[5] Y. Higashi: Critical parameters for HFC134a, HFC32 and HFC125. In: Int. J. Refrig. Volume 17, 1994, pp. 524-531.