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Pentane, 3-methyl-

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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, Chris Muzny, director
AC - William E. Acree, Jr., James S. Chickos
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DH - Eugene S. Domalski and Elizabeth D. Hearing

Quantity Value Units Method Reference Comment
Tboil336.4 ± 0.4KAVGN/AAverage of 53 out of 57 values; Individual data points
Quantity Value Units Method Reference Comment
Tfus155.15KN/AHoog, Smittenberg, et al., 1937Uncertainty assigned by TRC = 2. K; TRC
Tfus155.15KN/ABruun and Hicks-Brunn, 1930Uncertainty assigned by TRC = 1. K; TRC
Quantity Value Units Method Reference Comment
Ttriple110.25KN/AFinke and Messerly, 1973Uncertainty assigned by TRC = 0.006 K; by extrapolation of 1/f to 0; TRC
Quantity Value Units Method Reference Comment
Tc504. ± 4.KAVGN/AAverage of 8 values; Individual data points
Quantity Value Units Method Reference Comment
Pc30.7 ± 0.6atmAVGN/AAverage of 6 values; Individual data points
Quantity Value Units Method Reference Comment
Vc0.368l/molN/ADaubert, 1996 
Quantity Value Units Method Reference Comment
rhoc2.72 ± 0.02mol/lN/ADaubert, 1996 
rhoc2.72mol/lN/AGenco, Teja, et al., 1980Uncertainty assigned by TRC = 0.06 mol/l; TRC
rhoc2.73mol/lN/AKay, 1946Uncertainty assigned by TRC = 0.02 mol/l; by extrapolation of rectilinear diameter to Tc; TRC
Quantity Value Units Method Reference Comment
Deltavap7.24 ± 0.04kcal/molAVGN/AAverage of 6 values; Individual data points

Enthalpy of vaporization

DeltavapH (kcal/mol) Temperature (K) Method Reference Comment
6.707336.4N/AMajer and Svoboda, 1985 
7.15331.N/ALoras, Aucejo, et al., 1999Based on data from 316. - 361. K.; AC
7.29308.AStephenson and Malanowski, 1987Based on data from 293. - 338. K.; AC
7.05 ± 0.02313.CMajer, Svoboda, et al., 1979AC
6.76 ± 0.02333.CMajer, Svoboda, et al., 1979AC
6.45 ± 0.02353.CMajer, Svoboda, et al., 1979AC
7.170 ± 0.002303.1CWaddington, Smith, et al., 1949ALS
7.17 ± 0.02303.CWaddington, Smith, et al., 1949AC
6.88 ± 0.02324.CWaddington, Smith, et al., 1949AC
6.72 ± 0.02336.CWaddington, Smith, et al., 1949AC
7.22303.MMWillingham, Taylor, et al., 1945Based on data from 288. - 337. K.; AC

Enthalpy of vaporization

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

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Temperature (K) 298. - 353.
A (kcal/mol) 10.81
alpha 0.
beta 0.2703
Tc (K) 504.4
ReferenceMajer and Svoboda, 1985

Antoine Equation Parameters

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

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Temperature (K) A B C Reference
288.44 - 337.233.968061152.368-46.021Williamham, Taylor, et al., 1945

Enthalpy of fusion

DeltafusH (kcal/mol) Temperature (K) Reference Comment
1.27110.3Domalski and Hearing, 1996AC

Enthalpy of phase transition

DeltaHtrs (kcal/mol) Temperature (K) Initial Phase Final Phase Reference Comment
1.2675110.26crystaline, IliquidFinke and Messerly, 1973, 2DH

Entropy of phase transition

DeltaStrs (cal/mol*K) Temperature (K) Initial Phase Final Phase Reference Comment
11.496110.26crystaline, IliquidFinke and Messerly, 1973, 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.

Hoog, Smittenberg, et al., 1937
Hoog, H.; Smittenberg, J.; Visser, G.H., Composition of the Primary Polymerization Prod. of Propene and Butenes in IIe Congr. Mondial Pet. 2, Sect. 2, Phys. Chim. Raffin- age, p 489, 1937. [all data]

Bruun and Hicks-Brunn, 1930
Bruun, J.H.; Hicks-Brunn, M.M., The Isolation of the Isomers of Hexane from Petroleum, J. Res. Natl. Bur. Stand. (U. S.), 1930, 5, 933. [all data]

Finke and Messerly, 1973
Finke, H.L.; Messerly, J.F., 3-Methylpentane and 3-Methylheptane: Low-temperature Thermo. Properties properties, J. Chem. Thermodyn., 1973, 5, 247. [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]

Genco, Teja, et al., 1980
Genco, J.M.; Teja, A.S.; Kay, W.B., Study of the critical and azeotropic behavior of binary mixtures I critical states of perfluoromethylcyclohexane + isomeric hexane systems, J. Chem. Eng. Data, 1980, 25, 350. [all data]

Kay, 1946
Kay, W.B., The Vapor Pressures and Saturated Liquid and Vapor Densities of the Isomeric Hexanes, J. Am. Chem. Soc., 1946, 68, 1336. [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]

Loras, Aucejo, et al., 1999
Loras, Sonia; Aucejo, Antonio; Muñoz, Rosa, Vapor--liquid equilibria in the systems 3-methylpentane+methyl 1,1-dimethylethyl ether and 3-methylpentane+methyl 1,1-dimethylpropyl ether at 101.3 kPa, Fluid Phase Equilibria, 1999, 156, 1-2, 185-195, https://doi.org/10.1016/S0378-3812(99)00028-X . [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]

Majer, Svoboda, et al., 1979
Majer, Vladimír; Svoboda, Václav; Hála, Slavoj; Pick, Jirí, Temperature dependence of heats of vaporization of saturated hydrocarbons C5-C8; Experimental data and an estimation method, Collect. Czech. Chem. Commun., 1979, 44, 3, 637-651, https://doi.org/10.1135/cccc19790637 . [all data]

Waddington, Smith, et al., 1949
Waddington, G.; Smith, J.C.; Scott, D.W.; Huffman, H.M., Experimental vapor heat capacities and heats of vaporization of 2-methylpentane, 3-methylpentane and 2,3-dimethylbutane, J. Am. Chem. Soc., 1949, 71, 3902-3906. [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]

Williamham, Taylor, et al., 1945
Williamham, 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. Stand. (U.S.), 1945, 35, 3, 219-244, https://doi.org/10.6028/jres.035.009 . [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]

Finke and Messerly, 1973, 2
Finke, H.L.; Messerly, J.F., 3-Methylpentane and 3-methylheptane: low-temperature thermodynamic properties, J. Chem. Thermodynam., 1973, 5, 247-257. [all data]


Notes

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