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Heptane, 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:
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
Tboil392. ± 1.KAVGN/AAverage of 27 out of 28 values; Individual data points
Quantity Value Units Method Reference Comment
Tfus152. ± 1.KAVGN/AAverage of 15 out of 16 values; Individual data points
Quantity Value Units Method Reference Comment
Ttriple152.65KN/AFinke and Messerly, 1973Uncertainty assigned by TRC = 0.008 K; by exatroplation to 1/f = 0; TRC
Quantity Value Units Method Reference Comment
Tc563.6 ± 0.5KN/ADaubert, 1996 
Tc563.7KN/AMajer and Svoboda, 1985 
Tc563.60KN/AMcMicking and Kay, 1965Uncertainty assigned by TRC = 0.4 K; TRC
Quantity Value Units Method Reference Comment
Pc25.2 ± 0.4atmN/ADaubert, 1996 
Pc25.127atmN/AMcMicking and Kay, 1965Uncertainty assigned by TRC = 0.4000 atm; TRC
Quantity Value Units Method Reference Comment
Vc0.464l/molN/ADaubert, 1996 
Quantity Value Units Method Reference Comment
rhoc2.15 ± 0.04mol/lN/ADaubert, 1996 
rhoc2.15mol/lN/AMcMicking and Kay, 1965Uncertainty assigned by TRC = 0.04 mol/l; TRC
Quantity Value Units Method Reference Comment
Deltavap9.532kcal/molN/AMajer and Svoboda, 1985 
Deltavap9.51 ± 0.05kcal/molCAn, Hu, et al., 1987AC
Deltavap9.51kcal/molN/AReid, 1972AC
Deltavap9.51 ± 0.02kcal/molCOsborne and Ginnings, 1947AC
Deltavap9.520kcal/molCOsborne and Ginnings, 1947, 2ALS

Enthalpy of vaporization

DeltavapH (kcal/mol) Temperature (K) Method Reference Comment
8.045392.1N/AMajer and Svoboda, 1985 
9.58301.AStephenson and Malanowski, 1987Based on data from 286. - 393. K.; AC
9.94271.IPStephenson and Malanowski, 1987Based on data from 238. - 286. K. See also Osborn and Douslin, 1974.; AC
9.15331.MMWillingham, Taylor, et al., 1945Based on data from 316. - 393. K.; AC

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 Comment
238. - 288.4.506771568.919-40.686Osborn and Douslin, 1974Coefficents calculated by NIST from author's data.
315.82 - 392.964.018641331.53-60.555Williamham, Taylor, et al., 1945 

Enthalpy of fusion

DeltafusH (kcal/mol) Temperature (K) Reference Comment
2.789152.6Domalski and Hearing, 1996AC

Enthalpy of phase transition

DeltaHtrs (kcal/mol) Temperature (K) Initial Phase Final Phase Reference Comment
2.7949152.6574crystaline, IliquidFinke and Messerly, 1973, 2DH

Entropy of phase transition

DeltaStrs (cal/mol*K) Temperature (K) Initial Phase Final Phase Reference Comment
1.832152.6574crystaline, 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.

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]

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]

An, Hu, et al., 1987
An, Xuwu; Hu, Riheng; Wang, Hu; Wu, Mali; Zou, Yongkuang, Enthalpies of Vaporization of «alpha»- and «beta»-Pinene, Acta Phys. Chim. Sin., 1987, 3, 6, 668-671, https://doi.org/10.3866/PKU.WHXB19870621 . [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]

Osborn and Douslin, 1974
Osborn, Ann G.; Douslin, Donald R., Vapor-pressure relations for 15 hydrocarbons, J. Chem. Eng. Data, 1974, 19, 2, 114-117, https://doi.org/10.1021/je60061a022 . [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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