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Octane

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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
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
Tboil398.7 ± 0.5KAVGN/AAverage of 75 out of 89 values; Individual data points
Quantity Value Units Method Reference Comment
Tfus216.3 ± 0.3KAVGN/AAverage of 39 out of 41 values; Individual data points
Quantity Value Units Method Reference Comment
Ttriple216.2 ± 0.6KAVGN/AAverage of 9 values; Individual data points
Quantity Value Units Method Reference Comment
Tc568.9 ± 0.5KAVGN/AAverage of 23 values; Individual data points
Quantity Value Units Method Reference Comment
Pc24.6 ± 0.1atmAVGN/AAverage of 12 values; Individual data points
Quantity Value Units Method Reference Comment
Vc0.492l/molN/AAmbrose and Tsonopoulos, 1995 
Quantity Value Units Method Reference Comment
rhoc2.034 ± 0.007mol/lAVGN/AAverage of 7 values; Individual data points
Quantity Value Units Method Reference Comment
Deltavap10. ± 1.kcal/molAVGN/AAverage of 10 values; Individual data points

Enthalpy of vaporization

DeltavapH (kcal/mol) Temperature (K) Method Reference Comment
8.224398.8N/AMajer and Svoboda, 1985 
9.42338.EBEwing and Ochoa, 2003Based on data from 323. - 563. K.; AC
9.80312.AStephenson and Malanowski, 1987Based on data from 297. - 400. K.; AC
10.6263.AStephenson and Malanowski, 1987Based on data from 216. - 278. K.; AC
8.68411.AStephenson and Malanowski, 1987Based on data from 396. - 432. K.; AC
8.48443.AStephenson and Malanowski, 1987Based on data from 428. - 510. K.; AC
8.34521.AStephenson and Malanowski, 1987Based on data from 506. - 569. K.; AC
9.85310.N/APaul, Krug, et al., 1986Based on data from 295. - 402. K.; AC
10.0313.N/AMichou-Saucet, Jose, et al., 1984Based on data from 298. - 333. K.; AC
9.68 ± 0.02313.CMajer, Svoboda, et al., 1979AC
9.35 ± 0.02333.CMajer, Svoboda, et al., 1979AC
9.03 ± 0.02353.CMajer, Svoboda, et al., 1979AC
10.3282.N/ACarruth and Kobayashi, 1973Based on data from 217. - 297. K.; AC
9.08 ± 0.02311.CMcKay and Sage, 1960AC
8.77 ± 0.02328.CMcKay and Sage, 1960AC
8.46 ± 0.02344.CMcKay and Sage, 1960AC
9.37341.MMWillingham, Taylor, et al., 1945Based on data from 326. - 400. 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. - 426.
A (kcal/mol) 13.97
alpha 0.1834
beta 0.3324
Tc (K) 568.8
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 Comment
216.59 - 297.105.19551936.281-20.143Carruth and Kobayashi, 1973Coefficents calculated by NIST from author's data.
326.08 - 399.724.042961355.126-63.633Williamham, Taylor, et al., 1945 

Enthalpy of sublimation

DeltasubH (kcal/mol) Temperature (K) Method Reference Comment
16.3216.BBondi, 1963AC

Enthalpy of fusion

DeltafusH (kcal/mol) Temperature (K) Method Reference Comment
4.9570216.38N/AFinke, Gross, et al., 1954DH
5.21216.6DSCMondieig, Rajabalee, et al., 2004AC
4.957216.4N/ADomalski and Hearing, 1996AC
4.9359215.8N/AHuffman, Parks, et al., 1931DH
4.8021215.6N/AParks, Huffman, et al., 1930DH

Entropy of fusion

DeltafusS (cal/mol*K) Temperature (K) Reference Comment
22.91216.38Finke, Gross, et al., 1954DH
22.9215.8Huffman, Parks, et al., 1931DH
22.27215.6Parks, Huffman, et al., 1930DH

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.

Ambrose and Tsonopoulos, 1995
Ambrose, D.; Tsonopoulos, C., Vapor-Liquid Critical Properties of Elements and Compounds. 2. Normal Alkenes, J. Chem. Eng. Data, 1995, 40, 531-546. [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]

Ewing and Ochoa, 2003
Ewing, M.B.; Ochoa, J.C. Sanchez, The vapour pressures of n-octane determined using comparative ebulliometry, Fluid Phase Equilibria, 2003, 210, 2, 277-285, https://doi.org/10.1016/S0378-3812(03)00174-2 . [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]

Paul, Krug, et al., 1986
Paul, Hanns-Ingolf; Krug, Joseph; Knapp, Helmut, Measurements of VLE, hE and vE for binary mixtures of n-alkanes with n-alkylbenzenes, Thermochimica Acta, 1986, 108, 9-27, https://doi.org/10.1016/0040-6031(86)85073-0 . [all data]

Michou-Saucet, Jose, et al., 1984
Michou-Saucet, Marie-Annie; Jose, Jacques; Michou-Saucet, Christian; Merlin, J.C., Pressions de vapeur et enthalpies libres d'exces de systemes binaires: Hexamethylphosphorotriamide (HMPT) + n-hexane; n-heptane; n-octane: A 298,15 K; 303,15 K; 313,15 K; 323,15 K; 333,15 K, Thermochimica Acta, 1984, 75, 1-2, 85-106, https://doi.org/10.1016/0040-6031(84)85009-1 . [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]

Carruth and Kobayashi, 1973
Carruth, Grant F.; Kobayashi, Riki, Vapor pressure of normal paraffins ethane through n-decane from their triple points to about 10 mm mercury, J. Chem. Eng. Data, 1973, 18, 2, 115-126, https://doi.org/10.1021/je60057a009 . [all data]

McKay and Sage, 1960
McKay, R.A.; Sage, B.H., Latent Heat of Vaporization for n-Octane., J. Chem. Eng. Data, 1960, 5, 1, 21-24, https://doi.org/10.1021/je60005a005 . [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]

Bondi, 1963
Bondi, A., Heat of Siblimation of Molecular Crystals: A Catalog of Molecular Structure Increments., J. Chem. Eng. Data, 1963, 8, 3, 371-381, https://doi.org/10.1021/je60018a027 . [all data]

Finke, Gross, et al., 1954
Finke, H.L.; Gross, M.E.; Waddington, G.; Huffman, H.M., Low-temperature thermal data for the nine normal paraffin hydrocarbons from octane to hexadecane, J. Am. Chem. Soc., 1954, 76, 333-341. [all data]

Mondieig, Rajabalee, et al., 2004
Mondieig, D.; Rajabalee, F.; Metivaud, V.; Oonk, H.A.J.; Cuevas-Diarte, M.A., n -Alkane Binary Molecular Alloys, Chem. Mater., 2004, 16, 5, 786-798, https://doi.org/10.1021/cm031169p . [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., 1931
Huffman, H.M.; Parks, G.S.; Barmore, M., Thermal data on organic compounds. X. Further studies on the heat capacities, entropies and free energies of hydrocarbons, J. Am. Chem. Soc., 1931, 53, 3876-3888. [all data]

Parks, Huffman, et al., 1930
Parks, G.S.; Huffman, H.M.; Thomas, S.B., Thermal data on organic compounds. VI. The heat capacities, entropies and free energies of some saturated, non-benzenoid hydrocarbons, J. Am. Chem. Soc., 1930, 52, 1032-1041. [all data]


Notes

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