-183.6 °C (89.6 K)
-127.8 °C (145.4 K)
0.0038 %V at 25 °C
106.5 kPa in ~ -127 °C
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Tetrafluoromethane, likewise known together carbon tetrafluoride, Freon-14 and R 14, is a carbon fluoride (CF4). It can be thought about either a haloalkane, halomethane, perfluorocarbon or an not natural compound.
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At temperature -198 °C, it has actually monoclinic framework with lattice constants a = 8.597, b = 4.433, c = 8.381 (.10-1 nm), β = 118.73°<1>.
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Contents
extr physical nature
| thickness (ρ) in ~ -196 °C (solid) | 1.943 g.cm-3 |
| density (ρ) in ~ -183 °C | 1.89 g.cm-3 |
| thickness (ρ) at -127.8 °C (liquid) | 1.603 g.cm-3 |
| density (ρ) at -80 °C (gas) | 1.317 kg.m-3 |
| thickness (ρ) in ~ 15 °C (gas) | 3.72 kg.m-3 |
| density (ρ) at 21 °C (gas) | 3.858 kg.m-3 |
| Triple point temperature (Tt) | -183.7 °C (89.4 K) |
| an important temperature (Tc) | -45.5 °C (227.6 K) |
| an important pressure (pc) | 3.793 MPa (37.43 bar) |
| crucial volume (Vc) | 0.142 dm3.mol-1 |
| critical compressibility (Zc) | 2.77 |
| Latent warm of blend (lf) in ~ triple point | 8.09 kJ.kg-1 |
| Latent warm of vaporization (lv) in ~ -127.8 °C | 135.7 kJ.kg-1 |
| certain heat capacity at constant pressure (cp) in ~ 30 °C | 58 J.mol-1.K-1 |
| specific heat capacity at constant pressure (cp) in ~ -145 °C | 80.08 J.mol-1.K-1 |
| specific heat volume at consistent volume (cv) at 30 °C | 49 J.mol-1.K-1 |
| warm capacity proportion (κ) at 30 °C | 1.178571 |
| Compressibility variable (Z) at 15 °C | 0.9981 |
| Acentric element (ω) | 0.177 |
| Dipole moment | 0 D |
| Viscosity (η) in ~ 0 °C | 16.1 μPa.s (0.0161 cP) |
| Viscosity (η) in ~ -60.3 °C | 17.0 μPa.s (0.0170 cP) |
| Surface stress and anxiety (σ) in ~ -80 °C | 6.4 mN.m-1 |
| heat conductivity (λ) in ~ 0 °C | 15.03 mW.m-1.K-1 |
Chemistry<2>
Pure tetrafluoromethane was all set the an initial time in 1926.
Tetrafluoromethane deserve to be all set in activities by reaction:
SiC + 2 F2 → CF4 + Sior by fluorination the carbon dioxide, carbon monoxide or phosgene through sulfur tetrafluoride. Commercially that is manufactured by aggressive reaction the fluorine with dichlorodifluoromethane or chlorotrifluoromethane. Another way is electrolysis the fluorides MF, MF2 through carbon electrode.
Tetrafluoromethane, as various other fluorinated hydrocarbons, is very stable as result of strength of C-F bonds v bonding energy of 515 kJ.mol-1 (see ecological effects). As such it is inert come acids and hydroxides influence, however, it reacts explosively with alkali metals. Thermal decomposition produces very toxic gases (carbonyl fluoride, carbon monoxide and also in existence of water likewise corrosive hydrogen fluoride.
It is really slightly dissolve in water (about 20 mg.l-1), however miscible v ethanol, ether, benzine.
supplies
Tetrafluoromethane is sometimes used together a low temperature refrigerant. That is used in circuit board manufacture, manufacture of insulating materials and also semiconductors. It is used as a gas etchant and also dry/plasma etching.
environmental effects
Tetrafluoromethane is a gas the contributes to the greenhouse effect. The is an extremely stable and lasts a lengthy time in the atmosphere and is a very powerful greenhouse gas. That atmospheric lifetime is 50,000 year and an international warming aspect is 6500 (carbon dioxide has actually a element of 1). Return structurally similar to chlorofluorocarbons, tetrafluoromethane go not deplete the ozone layer. This is because the depletion is led to by the chlorine atom in CFCs, i beg your pardon dissociate when struck by UV radiation. Carbon-fluorine bonds room stronger and also less most likely to dissociate.
Health risks
Inhalation that tetrafluoromethane have the right to cause, according to concentration, headache, nausea, dizziness and also damage that cardiovascular system (mainly heart). Long-terming exposure can reason heavy heart damage.
Because of its more heavier density, it have the right to fill up ground area and also in non-ventilated areas can cause asphyxiation.
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referrals
See likewise
Tetrahalomethane Fluoromethane Tetrabromomethane Silicon tetrafluorideCategories: not natural carbon compound | Fluorides | Nonmetal halides | Organofluorides | Halomethanes | Refrigerants