1,1,1-trifluoroethane
Structural formula | ||||||||||||||||
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General | ||||||||||||||||
Surname | 1,1,1-trifluoroethane | |||||||||||||||
other names |
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Molecular formula | C 2 H 3 F 3 | |||||||||||||||
Brief description |
colorless gas with a sweet smell |
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properties | ||||||||||||||||
Molar mass | 84.04 g mol −1 | |||||||||||||||
Physical state |
gaseous |
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density |
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Melting point |
−111.3 ° C |
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boiling point |
−47.2 ° C |
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safety instructions | ||||||||||||||||
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Global warming potential |
5508 (based on 100 years) |
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As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . |
Trifluoroethane is a gaseous organic-chemical compound from the group of fluorocarbons (PFCs).
properties
Trifluoroethane is an extremely flammable gas which forms explosive mixtures with air. The explosion range is between 9.5 vol.% As the lower explosion limit (LEL) and 19 vol.% As the upper explosion limit (UEL). With a relative gas density of 2.96 (air = 1), the gas is heavier than air and therefore collects on the ground. When the liquid flows out or when large amounts of gas escape, cold mists form and spread across the floor. The vapor pressures at different temperatures are given in the following table:
T in ° C | −10 | 10 | 20th | 30th | 50 | 70 |
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p in cash | 4.4 | 8.3 | 11.1 | 14.4 | 23.1 | 35.3 |
According to Antoine, the vapor pressure function results from log 10 (P) = A− (B / (T + C)) (P in bar, T in K) with A = 4.02423, B = 786.645 and C = −30.093 in the temperature range from 174 K to 226 K.
property | Type | Value [unit] | Remarks |
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Standard enthalpy of formation | Δ f H 0 gas | −748.7 kJ mol −1 | |
Enthalpy of combustion | Δ c H 0 gas | −1008 kJ mol −1 | |
Heat capacity | c p | 109.66 J mol −1 K −1 (220 K) | as a liquid |
Triple point | T triple | 161.82 K | |
Critical temperature | T c | 345.86K | |
Critical pressure | p c | 37.64 bar | |
Critical density | ρ c | 5.16 mol·l −1 |
use
C 2 H 3 F 3 is used as a refrigerant .
environment
As a greenhouse gas, trifluoroethane is around 5500 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 h i Entry for CAS no. 420-46-2 in the GESTIS substance database of the IFA , accessed on April 22, 2016(JavaScript required) .
- ↑ 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 ).
- ↑ a b G. Sorbe: Safety characteristics of chemical substances. - 82nd supplementary delivery 6/2001, ecomed Verlag Heidelberg, ISBN 3-609-73060-9 .
- ↑ H. Russell Jr., DRV Golding, DM Yost: The heat capacity, heats of transition, fusion and vaporization, vapor pressure and entropy of 1,1,1-trifluoroethane. In: J. Am. Chem. Soc. 66 (1944) pp. 16-20. doi : 10.1021 / ja01229a006 .
- ^ E. Wu, AS Rodgers: Thermochemistry of gas-phase equilibrium CF3CH3 + I2 = CF3CH2I + HI. The carbon-hydrogen bond dissociation energy in 1,1,1-trifluoroethane and the heat of formation of the 2,2,2-trifluoroethyl radical. in J. Phys. Chem. , 1974, 78, pp. 2315-2317.
- ↑ VP Kolesov, AM Martynov, SM Skuratov: Standard enthalpy of formation of 1,1,1-trifluoroethane. In: Russ. J. Phys. Chem. (Engl. Transl.) 39 (1965) 39, pp. 223-225.
- ^ A b H. Russell Jr., DRV Golding, DM Yost: The heat capacity, heats of transition, fusion and vaporization, vapor pressure and entropy of 1,1,1-trifluoroethane. In: J. Am. Chem. Soc. 1944, 66, pp. 16-20.
- ↑ a b c K. Fujiwara, S. Nakamura, M. Noguchi: Critical Parameters and Vapor Pressure Measurements for 1,1,1-Trifluoroethane (R-143a). In J. Chem. Eng. Data 43 (1998) pp. 55-59, doi : 10.1021 / je970177h .