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Benzene, 1,3-dimethyl-

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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
DRB - Donald R. Burgess, Jr.
DH - Eugene S. Domalski and Elizabeth D. Hearing

Quantity Value Units Method Reference Comment
Tboil412.3 ± 0.3KAVGN/AAverage of 40 out of 43 values; Individual data points
Quantity Value Units Method Reference Comment
Tfus225. ± 4.KAVGN/AAverage of 9 values; Individual data points
Quantity Value Units Method Reference Comment
Ttriple219.6KN/AHuffman, Parks, et al., 1930Uncertainty assigned by TRC = 0.3 K; TRC
Quantity Value Units Method Reference Comment
Tc618. ± 4.KAVGN/AAverage of 9 values; Individual data points
Quantity Value Units Method Reference Comment
Pc35.4 ± 0.4barN/ATsonopoulos and Ambrose, 1995 
Pc35.412barN/AAmbrose, 1987Uncertainty assigned by TRC = 0.05 bar; TRC
Pc35.41barN/AAmbrose, Broderick, et al., 1967Uncertainty assigned by TRC = 0.06 bar; TRC
Pc33.4373barN/AGlaser and Ruland, 1957Uncertainty assigned by TRC = 1.5199 bar; TRC
Pc35.10barN/AAltschul, 1893Uncertainty assigned by TRC = 0.0392 bar; TRC
Quantity Value Units Method Reference Comment
Vc0.375l/molN/ATsonopoulos and Ambrose, 1995 
Quantity Value Units Method Reference Comment
rhoc2.67 ± 0.04mol/lN/ATsonopoulos and Ambrose, 1995 
rhoc2.684mol/lN/AAkhundov and Asadullaeva, 1968Uncertainty assigned by TRC = 0.05 mol/l; TRC
Quantity Value Units Method Reference Comment
Deltavap41. ± 5.kJ/molAVGN/AAverage of 8 values; Individual data points

Enthalpy of vaporization

DeltavapH (kJ/mol) Temperature (K) Method Reference Comment
35.66412.3N/AMajer and Svoboda, 1985 
39.2375.N/ASwiatek and Malanowski, 2002Based on data from 360. - 410. K.; AC
40.7342.N/APark and Gmehling, 1989Based on data from 327. - 412. K.; AC
44.7282.AStephenson and Malanowski, 1987Based on data from 267. - 301. K.; AC
37.5427.AStephenson and Malanowski, 1987Based on data from 412. - 462. K.; AC
36.4476.AStephenson and Malanowski, 1987Based on data from 461. - 554. K.; AC
36.2565.AStephenson and Malanowski, 1987Based on data from 550. - 617. K.; AC
40.4346.MMStephenson and Malanowski, 1987Based on data from 331. - 415. K. See also Willingham, Taylor, et al., 1945 and Forziati, Norris, et al., 1949.; AC
38.7395.N/AMachat, 1983Based on data from 380. - 411. K.; AC
43.2288.N/APitzer and Scott, 1943Based on data from 273. - 333. K. See also Boublik, Fried, et al., 1984.; 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
332.4 - 413.194.136071463.218-57.991Williamham, Taylor, et al., 1945Coefficents calculated by NIST from author's data.
273. - 333.5.091991996.545-14.772Pitzer and Scott, 1943Coefficents calculated by NIST from author's data.

Enthalpy of fusion

DeltafusH (kJ/mol) Temperature (K) Reference Comment
11.569225.27Pitzer and Scott, 1943DH
11.59225.3Domalski and Hearing, 1996AC

Entropy of fusion

DeltafusS (J/mol*K) Temperature (K) Reference Comment
51.36225.27Pitzer and Scott, 1943DH

Enthalpy of phase transition

DeltaHtrs (kJ/mol) Temperature (K) Initial Phase Final Phase Reference Comment
0.208166.crystaline, IIcrystaline, IHuffman, Parks, et al., 1930, 2DH
11.443219.6crystaline, IliquidHuffman, Parks, et al., 1930, 2DH

Entropy of phase transition

DeltaStrs (J/mol*K) Temperature (K) Initial Phase Final Phase Reference Comment
1.25166.crystaline, IIcrystaline, IHuffman, Parks, et al., 1930, 2DH
52.11219.6crystaline, IliquidHuffman, Parks, et al., 1930, 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.

Huffman, Parks, et al., 1930
Huffman, H.M.; Parks, G.S.; Daniels, A.C., Thermal Data on Organic Compounds: VII The Heat Capacities, Entropies and Free Energies of Twelve Aromatic Hydrocarbons, J. Am. Chem. Soc., 1930, 52, 1547-58. [all data]

Tsonopoulos and Ambrose, 1995
Tsonopoulos, C.; Ambrose, D., Vapor-Liquid Critical Properties of Elements and Compounds. 3. Aromatic Hydrocarbons, J. Chem. Eng. Data, 1995, 40, 547-558. [all data]

Ambrose, 1987
Ambrose, D., Vapor Pressures of Some Aromatic Hydrocarbons, J. Chem. Thermodyn., 1987, 19, 1007. [all data]

Ambrose, Broderick, et al., 1967
Ambrose, D.; Broderick, B.E.; Townsend, R., The Vapour Pressures above the Normal Boiling Point and the Critical Pressures of Some Aromatic Hydrocarbons, J. Chem. Soc. , 1967, 1967, 1967, 633-41. [all data]

Glaser and Ruland, 1957
Glaser, F.; Ruland, H., Untersuchungsen über dampfdruckkurven und kritische daten einiger technisch wichtiger organischer substanzen, Chem. Ing. Techn., 1957, 29, 772. [all data]

Altschul, 1893
Altschul, M., The critical values of some organic compounds, Z. Phys. Chem., Stoechiom. Verwandtschaftsl., 1893, 11, 577. [all data]

Akhundov and Asadullaeva, 1968
Akhundov, T.S.; Asadullaeva, N.N., Specific volumes of m-xylene near the critical point, Izv. Vyssh. Uchebn. Zaved., Neft Gaz, 1968, 11, 6, 836. [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]

Swiatek and Malanowski, 2002
Swiatek, Barbara E.; Malanowski, Stanislaw K., Vapor-Liquid Equilibrium in m -Xylene + Cyclohexanol at 19.99 and 94.93 kPa, J. Chem. Eng. Data, 2002, 47, 3, 478-481, https://doi.org/10.1021/je010246z . [all data]

Park and Gmehling, 1989
Park, So Jin; Gmehling, Juergen, Isobaric vapor-liquid equilibrium data for the binary systems 1,3,5-trimethylbenzene/N-formylmorpholine and m-xylene/N-formylmorpholine, J. Chem. Eng. Data, 1989, 34, 4, 399-401, https://doi.org/10.1021/je00058a008 . [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]

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]

Forziati, Norris, et al., 1949
Forziati, Alphonse F.; Norris, William R.; Rossini, Frederick D., Vapor pressures and boiling points of sixty API-NBS hydrocarbons, J. RES. NATL. BUR. STAN., 1949, 43, 6, 555-17, https://doi.org/10.6028/jres.043.050 . [all data]

Machat, 1983
Machat, V., , Thesis, Utzcht, Prague, 1983. [all data]

Pitzer and Scott, 1943
Pitzer, K.S.; Scott, D.W., The thermodynamics and molecular structure of benzene and its methyl derivatives, J. Am. Chem. Soc., 1943, 65, 803-829. [all data]

Boublik, Fried, et al., 1984
Boublik, T.; Fried, V.; Hala, E., The Vapour Pressures of Pure Substances: Selected Values of the Temperature Dependence of the Vapour Pressures of Some Pure Substances in the Normal and Low Pressure Region, 2nd ed., Elsevier, New York, 1984, 972. [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]

Huffman, Parks, et al., 1930, 2
Huffman, H.M.; Parks, G.S.; Daniels, A.C., Thermal data on organic compounds. VII. The heat capacities, entropies and free energies of twelve aromatic hydrocarbons, J. Am. Chem. Soc., 1930, 52, 1547-1558. [all data]


Notes

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