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Difluoromethane

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Phase change data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled as indicated in comments:
BS - Robert L. Brown and Stephen E. Stein
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Kenneth Kroenlein director
AC - William E. Acree, Jr., James S. Chickos

Quantity Value Units Method Reference Comment
Tboil221.4KN/APCR Inc., 1990BS
Tboil221.KN/AFilatov, Makarov, et al., 1968Uncertainty assigned by TRC = 2. K; TRC
Tboil221.6KN/ACroll and Scott, 1964Uncertainty assigned by TRC = 0.3 K; TRC
Tboil221.6KN/AHenne, Renoll, et al., 1939Uncertainty assigned by TRC = 1. K; TRC
Quantity Value Units Method Reference Comment
Tc351.3 ± 0.1KAVGN/AAverage of 6 values; Individual data points
Quantity Value Units Method Reference Comment
Pc57.85barN/AShi, Zhu, et al., 1998Uncertainty assigned by TRC = 0.03 bar; by extrapolation of vapor pressure to Tc; TRC
Pc57.85barN/AFu, Han, et al., 1995Uncertainty assigned by TRC = 0.04 bar; TRC
Pc57.85barN/AHigashi, 1994Uncertainty assigned by TRC = 0.09 bar; TRC
Pc57.840barN/ASato, Sato, et al., 1994Uncertainty assigned by TRC = 0.025 bar; TRC
Quantity Value Units Method Reference Comment
rhoc8.2 ± 0.1mol/lAVGN/AAverage of 7 values; Individual data points

Enthalpy of vaporization

DeltavapH (kJ/mol) Temperature (K) Method Reference Comment
20.6230.N/AKanungo, Oi, et al., 1987Based on data from 149. - 245. K.; AC
19.9271.AStephenson and Malanowski, 1987Based on data from 256. - 321. K.; AC
21.2207.AStephenson and Malanowski, 1987Based on data from 191. - 222. K.; AC
20.3243.AStephenson and Malanowski, 1987Based on data from 191. - 258. K.; AC
20.3331.AStephenson and Malanowski, 1987Based on data from 316. - 351. K.; AC
21.2206.N/AMalbrunot, Meunier, et al., 1968Based on data from 191. - 221. K.; AC
20.6227.N/AMalbrunot, Meunier, et al., 1968Based on data from 191. - 242. K.; AC

Antoine Equation Parameters

log10(P) = A − (B / (T + C))
    P = vapor pressure (bar)
    T = temperature (K)

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Temperature (K) A B C Reference Comment
191.19 - 241.334.26224821.092-28.554Malbrunot, Meunier, et al., 1968Coefficents calculated by NIST from author's data.

Enthalpy of fusion

DeltafusH (kJ/mol) Temperature (K) Reference Comment
4.36136.4L«65533»ddecke and Magee, 1996AC

In addition to the Thermodynamics Research Center (TRC) data available from this site, much more physical and chemical property data is available from the following TRC products:


References

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

PCR Inc., 1990
PCR Inc., Research Chemicals Catalog 1990-1991, PCR Inc., Gainesville, FL, 1990, 1. [all data]

Filatov, Makarov, et al., 1968
Filatov, A.S.; Makarov, S.P.; Yakubovich, A.Ya., Halogenation of 1,1,1-Trifluoroazomethane, Zh. Obshch. Khim., 1968, 38, 33. [all data]

Croll and Scott, 1964
Croll, I.M.; Scott, R.L., Fluorocarbon Solutions at Low Termperatures IV. The Liquid Mixtures CH4 + CClF3, CH2F2 + CClF3, CHF3 + CClF3, CF4 + CClF3, C2H6 + CClF3, C2H6 + CF4, and CHF3 + CF4, J. Phys. Chem., 1964, 68, 3853. [all data]

Henne, Renoll, et al., 1939
Henne, A.L.; Renoll, M.W.; Leicester, H.M., J. Am. Chem. Soc., 1939, 61, 938. [all data]

Shi, Zhu, et al., 1998
Shi, L.; Zhu, M.; Han, L.; Duan, Y.; Sun, L.; Fu, Y.-D., Thermophysical Properties of Difluoromethane (HFC-32), Science in China, Ser. E, 1998, 41, 435-42. [all data]

Fu, Han, et al., 1995
Fu, Y.D.; Han, L.-Z.; Zhu, M.-S., PVT properties, vapor pressures and critical parameters of HFC-32, Fluid Phase Equilib., 1995, 111, 273-86. [all data]

Higashi, 1994
Higashi, Y., Critical parameters for HFC134a, HFC32 and HFC125, Int. J. Refrig., 1994, 17, 524-531. [all data]

Sato, Sato, et al., 1994
Sato, T.; Sato, H.; Watanabe, K., PVT Property Measurements for Difluoromethane, J. Chem. Eng. Data, 1994, 39, 851-4. [all data]

Kanungo, Oi, et al., 1987
Kanungo, Arundhati.; Oi, Takao.; Popowicz, Anthony.; Ishida, Takanobu., Vapor pressure isotope effects in liquid methylene difluoride, J. Phys. Chem., 1987, 91, 15, 4198-4203, https://doi.org/10.1021/j100299a049 . [all data]

Stephenson and Malanowski, 1987
Stephenson, Richard M.; Malanowski, Stanislaw, Handbook of the Thermodynamics of Organic Compounds, 1987, https://doi.org/10.1007/978-94-009-3173-2 . [all data]

Malbrunot, Meunier, et al., 1968
Malbrunot, P.F.; Meunier, P.A.; Scatena, Georges M.; Mears, Whitney H.; Murphy, Kevin Paul.; Sinka, Joseph V., Pressure-volume-temperature behavior of difluoromethane, J. Chem. Eng. Data, 1968, 13, 1, 16-21, https://doi.org/10.1021/je60036a006 . [all data]

L«65533»ddecke and Magee, 1996
L«65533»ddecke, T.O.; Magee, J.W., Molar heat capacity at constant volume of difluoromethane (R32) and pentafluoroethane (R125) from the triple-point temperature to 345 K at pressures to 35 MPa, Int J Thermophys, 1996, 17, 4, 823-849, https://doi.org/10.1007/BF01439192 . [all data]


Notes

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