Difluoromethane
Title: Difluoromethane
CAS Registry Number: 75-10-5
Additional Names: HFC-32; methylene difluoride; R-32
Trademarks: Genetron 32 (Honeywell)
Molecular Formula: CH2F2
Molecular Weight: 52.02
Percent Composition: C 23.09%, H 3.88%, F 73.04%
Literature References: Hydrofluorocarbon refrigerant with zero ozone-depletion potential. Prepn: A. L. Henne, J. Am. Chem. Soc. 59, 1400 (1937). Structural studies: L. O. Brockway, J. Phys. Chem. 41, 185, 747 (1937); W. C. Hamilton, K. Hedberg, J. Am. Chem. Soc. 75, 5529 (1952). Microwave spectrum: D. R. Lide, Jr., ibid. 74, 3548 (1952). UV absorption spectrum: P. Wagner, A. B. F. Duncan, ibid. 77, 2609 (1955). Thermodynamic properties: P. F. Malbrunot et al., J. Chem. Eng. Data 13, 16 (1968); D. R. Defibaugh et al., ibid. 39, 333 (1994). Viscosity study: M. Takahashi et al., ibid. 40, 900 (1995). Toxicology and metabolism in rats: M. K. Ellis et al., Fundam. Appl. Toxicol. 31, 243 (1996).
Properties: Colorless gas, bp -51.6°. mp -136°. d0 (liq) 1.052. d25 (liq) 0.961. Critical temp 78.4°; critical press 57.54 atm; critical d 0.430. Dipole moment 1.98 D.
Melting point: mp -136°
Boiling point: bp -51.6°
Density: d0 (liq) 1.052; d25 (liq) 0.961; d 0.430
Use: Refrigerant.

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