[trahy-klawr-oh-floor-oh-meth-eyn, -flawr-; trahy-klohr-oh-floor-oh-meth-eyn, -flohr-]
}} Trichlorofluoromethane, also called freon-11, CFC-11, or R-11, is a chlorofluorocarbon. It is a colorless, nearly odorless liquid that boils at about room temperature.


It was the first widely used refrigerant. Because of its high boiling point (compared to most refrigerants), it can be used in systems with a low operating pressure, making the mechanical design of such systems less demanding than that of higher-pressure refrigerants R-12 or R-22.

Because of the high chlorine content and the ease with which the chlorine atoms can be displaced when the molecule is subject to ultraviolet light, R-11 has the highest ozone depletion potential of any refrigerant, by definition assigned the value 1.0. U.S. production was ended in 1995.

Trichlorofluoromethane is used as a reference compound for fluorine-19 NMR studies.

Table for physical properties

Property Value
Density (ρ) at 0 °C 1.5432
Density (ρ) at 18.82 °C 1.4905
Critical temperature (Tc) 198 °C (471 K)
Critical pressure (pc) 4.410 MPa (44.1 bar)
Critical density (ρc) 4.151 mol.l-1
Refractive index (n) at 20 °C, D 1.3821
Acentric factor (ω) 0.18875
Dipole moment 0.450 D
Ozone depletion potential (ODP) 1 (by definition)
Global warming potential (GWP) 4600 (CO2 = 1)

See also

External links

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