Butanoic acid, 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

Quantity Value Units Method Reference Comment
Tboil448. ± 3.KAVGN/AAverage of 24 values; Individual data points
Quantity Value Units Method Reference Comment
Tfus243.85KN/ATimmermans, 1952Uncertainty assigned by TRC = 0.4 K; TRC
Tfus243.KN/ATimmermans, 1935Uncertainty assigned by TRC = 2. K; TRC
Tfus243.15KN/ATimmermans, 1934Uncertainty assigned by TRC = 0.4 K; TRC
Tfus235.15KN/ATimmermans, 1911Uncertainty assigned by TRC = 0.5 K; TRC
Quantity Value Units Method Reference Comment
Tc629.KN/AAmbrose and Ghiassee, 1987Uncertainty assigned by TRC = 1. K; TRC
Tc633.83KN/ABrown, 1906Uncertainty assigned by TRC = 6. K; TRC
Quantity Value Units Method Reference Comment
Pc34.00barN/AAmbrose and Ghiassee, 1987Uncertainty assigned by TRC = 0.25 bar; TRC
Quantity Value Units Method Reference Comment
Δvap61.2 ± 0.3kJ/molGSVerevkin, 2000Based on data from 293. to 323. K.; AC
Δvap57.5 ± 3.0kJ/molVKruif and Oonk, 1979ALS
Δvap58. ± 3.kJ/molTEKruif and Oonk, 1979Based on data from 243. to 259. K.; AC
Δvap46.91 ± 0.18kJ/molCKonicek and Wadso, 1970ALS

Enthalpy of vaporization

ΔvapH (kJ/mol) Temperature (K) Method Reference Comment
53.8411.N/AClifford, Ramjugernath, et al., 2004Based on data from 396. to 448. K.; AC
60.7 ± 0.3308.GSVerevkin, 2000Based on data from 293. to 323. K.; AC
55.8379.A,EBAmbrose and Ghiassee, 1987, 2Based on data from 364. to 464. K.; AC
56.6322.AStephenson and Malanowski, 1987Based on data from 307. to 448. K.; AC
45.9375.N/AKahlbaum, 1894Based on data from 360. to 377. K.; AC

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
359.8 to 377.3-0.2658550.172-320.762Kahlbaum, 1894, 2Coefficents calculated by NIST from author's data.

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:


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.

Timmermans, 1952
Timmermans, J., Freezing points of organic compounds. VVI New determinations., Bull. Soc. Chim. Belg., 1952, 61, 393. [all data]

Timmermans, 1935
Timmermans, J., Researches in Stoichiometry. I. The Heat of Fusion of Organic Compounds., Bull. Soc. Chim. Belg., 1935, 44, 17-40. [all data]

Timmermans, 1934
Timmermans, J., Theory of Concentrated Solutions XII., Bull. Soc. Chim. Belg., 1934, 43, 626. [all data]

Timmermans, 1911
Timmermans, J., Researches on the freezing point of organic liquid compounds, Bull. Soc. Chim. Belg., 1911, 25, 300. [all data]

Ambrose and Ghiassee, 1987
Ambrose, D.; Ghiassee, N.B., Vapor Pressures and Critical Temperatures and Critical Pressures of Some Alkanoic Acids: C1 to C10, J. Chem. Thermodyn., 1987, 19, 505. [all data]

Brown, 1906
Brown, J.C., The critical temperature and value of ml/theta of some carbon compounds, J. Chem. Soc., Trans., 1906, 89, 311. [all data]

Verevkin, 2000
Verevkin, S.P., Measurement and Prediction of the Monocarboxylic Acids Thermochemical Properties, J. Chem. Eng. Data, 2000, 45, 5, 953-960, https://doi.org/10.1021/je990282m . [all data]

Kruif and Oonk, 1979
Kruif, C.G.; Oonk, H.A.J., Enthalpies of vaporization and vapour pressures of seven aliphatic carboxylic acids, J. Chem. Thermodyn., 1979, 11, 287-290. [all data]

Konicek and Wadso, 1970
Konicek, J.; Wadso, I., Enthalpies of vaporization of organic compounds. VII. Some carboxylic acids, Acta Chem. Scand., 1970, 24, 2612-26. [all data]

Clifford, Ramjugernath, et al., 2004
Clifford, Scott L.; Ramjugernath, Deresh; Raal, J. David, Subatmospheric Vapor Pressure Curves for Propionic Acid, Butyric Acid, Isobutyric Acid, Valeric Acid, Isovaleric Acid, Hexanoic Acid, and Heptanoic Acid, J. Chem. Eng. Data, 2004, 49, 5, 1189-1192, https://doi.org/10.1021/je034180e . [all data]

Ambrose and Ghiassee, 1987, 2
Ambrose, D.; Ghiassee, N.B., Vapour pressures and critical temperatures and critical pressures of some alkanoic acids: C1 to C10, The Journal of Chemical Thermodynamics, 1987, 19, 5, 505-519, https://doi.org/10.1016/0021-9614(87)90147-9 . [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]

Kahlbaum, 1894
Kahlbaum, G.W.A., Z. Phys. Chem., Stoechiom. Verwandtschaftsl., 1894, 13, 14. [all data]

Kahlbaum, 1894, 2
Kahlbaum, G.W.A., Studien uber Dampfspannkraftsmessungen, Z. Phys. Chem. (Leipzig), 1894, 13, 14-55. [all data]


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