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Pentane, 3,3-dimethyl-

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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 - R.L. Brown and S.E. Stein
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, M. Frenkel director
AC - W.E. Acree, Jr., J.S. Chickos
ALS - H.Y. Afeefy, J.F. Liebman, and S.E. Stein
DH - E.S. Domalski and E.D. Hearing

Quantity Value Units Method Reference Comment
Tboil359.2 ± 0.2KAVGN/AAverage of 34 out of 38 values; Individual data points
Quantity Value Units Method Reference Comment
Tfus138.1 ± 0.9KAVGN/AAverage of 25 values; Individual data points
Quantity Value Units Method Reference Comment
Ttriple138.75KN/AFinke, Messerly, et al., 1976Crystal phase 1 phase; Uncertainty assigned by TRC = 0.1 K; TRC
Ttriple138.2KN/AFinke, Messerly, et al., 1976Crystal phase 2 phase; Uncertainty assigned by TRC = 0.03 K; C2 is metastable at the melting point; TRC
Ttriple138.2KN/AHuffman, Parks, et al., 1930Uncertainty assigned by TRC = 0.2 K; TRC
Quantity Value Units Method Reference Comment
Tc536.4 ± 0.5KN/ADaubert, 1996 
Tc536.3KN/AMajer and Svoboda, 1985 
Tc536.34KN/AMcMicking and Kay, 1965Uncertainty assigned by TRC = 0.4 K; TRC
Quantity Value Units Method Reference Comment
Pc29.5 ± 0.5barN/ADaubert, 1996 
Pc29.458barN/AMcMicking and Kay, 1965Uncertainty assigned by TRC = 0.4053 bar; TRC
Quantity Value Units Method Reference Comment
Vc0.414l/molN/ADaubert, 1996 
Quantity Value Units Method Reference Comment
rhoc2.42 ± 0.05mol/lN/ADaubert, 1996 
rhoc2.42mol/lN/AMcMicking and Kay, 1965Uncertainty assigned by TRC = 0.05 mol/l; TRC
Quantity Value Units Method Reference Comment
Deltavap33.15kJ/molN/AMajer and Svoboda, 1985 
Deltavap33.0 ± 0.1kJ/molCHossenlopp and Scott, 1981AC
Deltavap33.0kJ/molN/AReid, 1972AC
Deltavap33.0 ± 0.1kJ/molCOsborne and Ginnings, 1947AC
Deltavap33.02kJ/molCOsborne and Ginnings, 1947, 2ALS

Enthalpy of vaporization

DeltavapH (kJ/mol) Temperature (K) Method Reference Comment
29.62359.2N/AMajer and Svoboda, 1985 
34.8266.N/AStephenson and Malanowski, 1987Based on data from 213. - 281. K.; AC
33.6295.N/AStephenson and Malanowski, 1987Based on data from 280. - 360. K.; AC
33.3300.MMStephenson and Malanowski, 1987Based on data from 285. - 360. K. See also Willingham, Taylor, et al., 1945.; AC
33.2302.N/AForziati, Norris, et al., 1949Based on data from 287. - 360. K.; AC

Enthalpy of vaporization

ΔvapH = A exp(-βTr) (1 − Tr)β
    ΔvapH = Enthalpy of vaporization (at saturation pressure) (kJ/mol)
    Tr = reduced temperature (T / Tc)

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Temperature (K) A (kJ/mol) beta Tc (K) Reference Comment
298. - 359.47.530.2661536.3Majer and Svoboda, 1985 

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
286.63 - 360.113.955681230.986-47.568Forziati, Norris, et al., 1949, 2Coefficents calculated by NIST from author's data.

Enthalpy of fusion

DeltafusH (kJ/mol) Temperature (K) Reference Comment
7.07138.2Domalski and Hearing, 1996AC
7.067138.2Huffman, Parks, et al., 1930, 2DH

Entropy of fusion

DeltafusS (J/mol*K) Temperature (K) Reference Comment
51.14138.2Huffman, Parks, et al., 1930, 2DH

Enthalpy of phase transition

DeltaHtrs (kJ/mol) Temperature (K) Initial Phase Final Phase Reference Comment
0.7937132.7crystaline, IIcrystaline, IFinke, Messerly, et al., 1976, 2DH
7.6425138.20crystaline, IIliquidFinke, Messerly, et al., 1976, 2DH
6.8463138.75crystaline, IliquidFinke, Messerly, et al., 1976, 2DH

Entropy of phase transition

DeltaStrs (J/mol*K) Temperature (K) Initial Phase Final Phase Reference Comment
5.98132.7crystaline, IIcrystaline, IFinke, Messerly, et al., 1976, 2DH
55.30138.20crystaline, IIliquidFinke, Messerly, et al., 1976, 2DH
49.34138.75crystaline, IliquidFinke, Messerly, et al., 1976, 2DH

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

Go To: Top, Phase change data, Notes

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

Finke, Messerly, et al., 1976
Finke, H.L.; Messerly, J.F.; Douslin, D.R., Low-Temp. Thermal Quantities for Five Alkyl-Substituted Pentanes, J. Chem. Thermodyn., 1976, 8, 965. [all data]

Huffman, Parks, et al., 1930
Huffman, H.M.; Parks, G.S.; Thomas, S.B., Thermal Data on Organic Compounds. VII The Heat Capacities, Entropies and Free Energies of the Isomeric Heptanes, J. Am. Chem. Soc., 1930, 52, 3241. [all data]

Daubert, 1996
Daubert, T.E., Vapor-Liquid Critical Properties of Elements and Compounds. 5. Branched Alkanes and Cycloalkanes, J. Chem. Eng. Data, 1996, 41, 365-372. [all data]

Majer and Svoboda, 1985
Majer, V.; Svoboda, V., Enthalpies of Vaporization of Organic Compounds: A Critical Review and Data Compilation, Blackwell Scientific Publications, Oxford, 1985, 300. [all data]

McMicking and Kay, 1965
McMicking, J.H.; Kay, W.B., Vapor Pressures and Saturated Liquid and Vapor Densities of The Isomeric Heptanes and Isomeric Octanes, Proc., Am. Pet. Inst., Sect. 3, 1965, 45, 75-90. [all data]

Hossenlopp and Scott, 1981
Hossenlopp, I.A.; Scott, D.W., Vapor heat capacities and enthalpies of vaporization of five alkane hydrocarbons, J. Chem. Thermodyn., 1981, 13, 415-421. [all data]

Reid, 1972
Reid, Robert C., Handbook on vapor pressure and heats of vaporization of hydrocarbons and related compounds, R. C. Wilhort and B. J. Zwolinski, Texas A Research Foundation. College Station, Texas(1971). 329 pages.$10.00, AIChE J., 1972, 18, 6, 1278-1278, https://doi.org/10.1002/aic.690180637 . [all data]

Osborne and Ginnings, 1947
Osborne, Nathan S.; Ginnings, Defoe C., Measurements of heat of vaporization and heat capacity of a number of hydrocarbons, J. RES. NATL. BUR. STAN., 1947, 39, 5, 453-17, https://doi.org/10.6028/jres.039.031 . [all data]

Osborne and Ginnings, 1947, 2
Osborne, N.S.; Ginnings, D.C., Measurements of heat of vaporization and heat capacity of a number of hydrocarbons, J. Res. NBS, 1947, 39, 453-477. [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]

Willingham, Taylor, et al., 1945
Willingham, C.B.; Taylor, W.J.; Pignocco, J.M.; Rossini, F.D., Vapor pressures and boiling points of some paraffin, alkylcyclopentane, alkylcyclohexane, and alkylbenzene hydrocarbons, J. RES. NATL. BUR. STAN., 1945, 35, 3, 219-17, https://doi.org/10.6028/jres.035.009 . [all data]

Forziati, Norris, et al., 1949
Forziati, Alphonse F.; Norris, William R.; Rossini, Frederick D., Vapor pressures and boiling points of sixty API-NBS hydrocarbons, J. RES. NATL. BUR. STAN., 1949, 43, 6, 555-17, https://doi.org/10.6028/jres.043.050 . [all data]

Forziati, Norris, et al., 1949, 2
Forziati, A.F.; Norris, W.R.; Rossini, F.D., Vapor Pressures and Boiling Points of Sixty API-NBS Hydrocarbons, J. Res. Natl. Bur. Stand. (U.S.), 1949, 43, 6, 555-563, https://doi.org/10.6028/jres.043.050 . [all data]

Domalski and Hearing, 1996
Domalski, Eugene S.; Hearing, Elizabeth D., Heat Capacities and Entropies of Organic Compounds in the Condensed Phase. Volume III, J. Phys. Chem. Ref. Data, 1996, 25, 1, 1, https://doi.org/10.1063/1.555985 . [all data]

Huffman, Parks, et al., 1930, 2
Huffman, H.M.; Parks, G.S.; Thomas, S.B., Thermal data on organic compounds. VIII. The heat capacities, entropies and free energies of the isomeric heptanes, J. Am. Chem. Soc., 1930, 52, 3241-3251. [all data]

Finke, Messerly, et al., 1976, 2
Finke, H.L.; Messerly, J.F.; Douslin, D.R., Low-temperature thermal quantities for five alkyl-substituted pentanes, J. Chem. Thermodynam., 1976, 8, 965-983. [all data]


Notes

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