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Pentane, 2-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:
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Kenneth Kroenlein director
BS - Robert L. Brown and Stephen E. Stein
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
Tboil334. ± 1.KAVGN/AAverage of 71 out of 73 values; Individual data points
Quantity Value Units Method Reference Comment
Tfus120. ± 7.KAVGN/AAverage of 21 values; Individual data points
Quantity Value Units Method Reference Comment
Ttriple119.55KN/ADouslin and Huffman, 1946Uncertainty assigned by TRC = 0.07 K; TRC
Ttriple119.55KN/AHuffman, 1945Uncertainty assigned by TRC = 0.03 K; based on To = 273.16 K; TRC
Ttriple119.7KN/AStull, 1937Uncertainty assigned by TRC = 0.1 K; measured by Wojciechowski; TRC
Quantity Value Units Method Reference Comment
Tc497.8 ± 0.4KAVGN/AAverage of 10 values; Individual data points
Quantity Value Units Method Reference Comment
Pc30.35 ± 0.07barAVGN/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 
rhoc2.734mol/lN/AHolcomb, Magee, et al., 1995Uncertainty assigned by TRC = 0.05 mol/l; TRC
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
Deltavap29. ± 4.kJ/molAVGN/AAverage of 6 values; Individual data points

Enthalpy of vaporization

DeltavapH (kJ/mol) Temperature (K) Method Reference Comment
27.79333.4N/AMajer and Svoboda, 1985 
30.2305.N/ASapei, Uusi-Kyyny, et al., 2010Based on data from 290. - 333. K.; AC
30.0316.N/APokki, Uusi-Kyyny, et al., 2002Based on data from 301. - 333. K.; AC
29.7325.N/AAucejo, Loras, et al., 1998Based on data from 310. - 359. K.; AC
30.5308.AStephenson and Malanowski, 1987Based on data from 293. - 335. K.; AC
28.7 ± 0.1318.CWaddington, Smith, et al., 1949AC
27.8 ± 0.1333.CWaddington, Smith, et al., 1949AC
30.4301.MMWillingham, Taylor, et al., 1945Based on data from 286. - 334. K.; AC
29.8 ± 0.2293.CLemons and Felsing, 1943AC
29.0 ± 0.2313.CLemons and Felsing, 1943AC
27.6 ± 0.2333.CLemons and Felsing, 1943AC
26.9 ± 0.2353.CLemons and Felsing, 1943AC

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. - 333.45.250.2739497.5Majer 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
285.91 - 334.223.96401135.41-46.578Williamham, Taylor, et al., 1945

Enthalpy of fusion

DeltafusH (kJ/mol) Temperature (K) Reference Comment
6.268119.55Douslin and Huffman, 1946, 2DH
6.27119.6Domalski and Hearing, 1996AC

Entropy of fusion

DeltafusS (J/mol*K) Temperature (K) Reference Comment
52.43119.55Douslin and Huffman, 1946, 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.

Douslin and Huffman, 1946
Douslin, D.R.; Huffman, H.M., Low-Temperature Thermal Data on the Five Isomeric Hexanes, J. Am. Chem. Soc., 1946, 68, 1704. [all data]

Huffman, 1945
Huffman, H.M., Personal Commun., U. S. Bur. Mines, Bartlesville, OK, July 25, 1945. [all data]

Stull, 1937
Stull, D.R., A Semi-micro Calorimeter for Measuring Heat Capacities at Low Temp., J. Am. Chem. Soc., 1937, 59, 2726. [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]

Holcomb, Magee, et al., 1995
Holcomb, C.D.; Magee, J.W.; Haynes, W.M., Density Measurements on Natural Gas Liquids, Research Report RR-147, Gas Processors Association Project 916, 1995. [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]

Sapei, Uusi-Kyyny, et al., 2010
Sapei, Erlin; Uusi-Kyyny, Petri; Keskinen, Kari I.; Alopaeus, Ville, Phase equilibria of binary systems of 3-methylthiophene with four different hydrocarbons, Fluid Phase Equilibria, 2010, 288, 1-2, 155-160, https://doi.org/10.1016/j.fluid.2009.11.004 . [all data]

Pokki, Uusi-Kyyny, et al., 2002
Pokki, Juha-Pekka; Uusi-Kyyny, Petri; Aittamaa, Juhani; Liukkonen, Simo, Vapor-Liquid Equilibrium for the 2-Methylpentane + 2-Methyl-2-propanol and + 2-Butanol Systems at 329 K, J. Chem. Eng. Data, 2002, 47, 2, 371-375, https://doi.org/10.1021/je0155296 . [all data]

Aucejo, Loras, et al., 1998
Aucejo, Antonio; Loras, Sonia; Muñoz, Rosa; Reich, Ricardo; Segura, Hugo, Isobaric Vapor-Liquid Equilibrium in the Systems 2-Methylpentane + Methyl 1,1-Dimethylethyl Ether, + Ethyl 1,1-Dimethylethyl Ether, and + Methyl 1,1-Dimethylpropyl Ether, J. Chem. Eng. Data, 1998, 43, 6, 973-977, https://doi.org/10.1021/je980090b . [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]

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]

Lemons and Felsing, 1943
Lemons, Joe Fred; Felsing, W.A., The Heats of Vaporization of Some Hexanes 1, J. Am. Chem. Soc., 1943, 65, 1, 46-48, https://doi.org/10.1021/ja01241a015 . [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]

Douslin and Huffman, 1946, 2
Douslin, D.R.; Huffman, H.M., Low-temperature thermal data on the five isometric hexanes, J. Am. Chem. Soc., 1946, 68, 1704-1708. [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]


Notes

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