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

Quantity Value Units Method Reference Comment
Tboil402. ± 1.KAVGN/AAverage of 34 out of 35 values; Individual data points
Quantity Value Units Method Reference Comment
Tfus206. ± 3.KAVGN/AAverage of 12 values; Individual data points
Quantity Value Units Method Reference Comment
Ttriple206.46KN/AScott, Hubbard, et al., 1963Uncertainty assigned by TRC = 0.05 K; by extrapolation of 1/f to 0.0; TRC
Ttriple206.44KN/AHelm, Lanum, et al., 1958Uncertainty assigned by TRC = 0.03 K; measured in calorimeter at USBM, Bartlesville, OK; TRC
Quantity Value Units Method Reference Comment
Tc621.KN/AMajer and Svoboda, 1985 
Tc621.1KN/AKobe and Mathews, 1970Uncertainty assigned by TRC = 1. K; TRC
Quantity Value Units Method Reference Comment
Pc46.00barN/AKobe and Mathews, 1970Uncertainty assigned by TRC = 0.6079 bar; TRC
Quantity Value Units Method Reference Comment
ρc2.99mol/lN/AKobe and Mathews, 1970Uncertainty assigned by TRC = 0.32 mol/l; TRC
Quantity Value Units Method Reference Comment
Δvap42.8 ± 0.7kJ/molAVGN/AAverage of 8 values; Individual data points

Enthalpy of vaporization

ΔvapH (kJ/mol) Temperature (K) Method Reference Comment
36.17402.6N/AMajer and Svoboda, 1985 
41.2 ± 0.1320.EBChirico, Knipmeyer, et al., 1999Based on data from 308. to 441. K.; AC
38.8 ± 0.1360.EBChirico, Knipmeyer, et al., 1999Based on data from 308. to 441. K.; AC
36.4 ± 0.1400.EBChirico, Knipmeyer, et al., 1999Based on data from 308. to 441. K.; AC
33.7 ± 0.3440.EBChirico, Knipmeyer, et al., 1999Based on data from 308. to 441. K.; AC
42.0307.EBLencka, 1990Based on data from 292. to 403. K.; AC
46.9230.AStephenson and Malanowski, 1987Based on data from 209. to 245. K.; AC
36.5444.AStephenson and Malanowski, 1987Based on data from 429. to 537. K.; AC
35.4536.AStephenson and Malanowski, 1987Based on data from 521. to 621. K.; AC
39.1367.EB,IPStephenson and Malanowski, 1987Based on data from 352. to 445. K. See also Osborn and Douslin, 1968.; AC
39.1367.EBStephenson and Malanowski, 1987Based on data from 352. to 442. K. See also Rysselberghe and Fristrom, 1945.; AC
41.6 ± 0.1313.CMajer, Svoboda, et al., 1984AC
40.7 ± 0.1328.CMajer, Svoboda, et al., 1984AC
39.8 ± 0.1343.CMajer, Svoboda, et al., 1984AC
38.3 ± 0.1368.CMajer, Svoboda, et al., 1984AC
39.8352.MGHerington and Martin, 1953Based on data from 337. to 403. K.; AC
38.8 ± 0.1359.CRysselberghe and Fristrom, 1945AC
37.7 ± 0.1379.CRysselberghe and Fristrom, 1945AC
36.2 ± 0.1402.CRysselberghe and Fristrom, 1945AC

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) β Tc (K) Reference Comment
298. to 403.58.880.2879621.Majer 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 Comment
352.94 to 441.514.136131401.681-63.162Scott, Hubbard, et al., 1963, 2Coefficents calculated by NIST from author's data.

Enthalpy of fusion

ΔfusH (kJ/mol) Temperature (K) Reference Comment
9.7240206.45Scott, Hubbard, et al., 1963, 2DH
9.72206.5Domalski and Hearing, 1996AC

Entropy of fusion

ΔfusS (J/mol*K) Temperature (K) Reference Comment
47.10206.45Scott, Hubbard, et al., 1963, 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.

Scott, Hubbard, et al., 1963
Scott, D.W.; Hubbard, W.N.; Messerly, J.F.; Todd, S.S.; Hossenlopp, I.A.; Good, W.D.; Douslin, D.R.; McCullough, J.P., Chemical Thermodynamic Properties and Internal Rotation of Methylpyridines I. 2-Methylpyridine, J. Phys. Chem., 1963, 67, 680. [all data]

Helm, Lanum, et al., 1958
Helm, R.V.; Lanum, W.J.; Cook, G.L.; Ball, J.S., Purification and Properties of Pyrrole, Pyrrolidine, Pyridine and 2-Methylpyridine, J. Phys. Chem., 1958, 62, 858. [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]

Kobe and Mathews, 1970
Kobe, K.A.; Mathews, J.F., Critical Properties and Vapor Pressures of Some Organic Nitrogen and Oxygen Compounds, J. Chem. Eng. Data, 1970, 15, 182. [all data]

Chirico, Knipmeyer, et al., 1999
Chirico, R.D.; Knipmeyer, S.E.; Nguyen, A.; Steele, W.V., Thermodynamic properties of the methylpyridines. Part 2. Vapor pressures, heat capacities, critical properties, derived thermodynamic functions between the temperatures 250 K and 560 K, and equilibrium isomer distributions for all temperatures ≥250 K, The Journal of Chemical Thermodynamics, 1999, 31, 3, 339-378, https://doi.org/10.1006/jcht.1998.0451 . [all data]

Lencka, 1990
Lencka, Malgorzata, Measurements of the vapour pressures of pyridine, 2-methylpyridine, 2,4-dimethylpyridine, 2,6-dimethylpyridine, and 2,4,6-trimethylpyridine from 0.1 kPa to atmospheric pressure using a modified Swietoslawski ebulliometer, The Journal of Chemical Thermodynamics, 1990, 22, 5, 473-480, https://doi.org/10.1016/0021-9614(90)90139-H . [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, 1968
Osborn, Ann G.; Douslin, Donald R., Vapor pressure relations of 13 nitrogen compounds related to petroleum, J. Chem. Eng. Data, 1968, 13, 4, 534-537, https://doi.org/10.1021/je60039a024 . [all data]

Rysselberghe and Fristrom, 1945
Rysselberghe, Pierre Van; Fristrom, Robert M., The Conductance of Non-aqueous Solutions of Magnesium and Calcium Perchlorates 1, J. Am. Chem. Soc., 1945, 67, 4, 680-682, https://doi.org/10.1021/ja01220a053 . [all data]

Majer, Svoboda, et al., 1984
Majer, V.; Svoboda, V.; Lencka, M., Enthalpies of vaporization and cohesive energies of pyridine and isomeric methylpyridines, J. Chem. Thermodyn., 1984, 16, 1019-1024. [all data]

Herington and Martin, 1953
Herington, E.F.G.; Martin, J.F., Vapour pressures of pyridine and its homologues, Trans. Faraday Soc., 1953, 49, 154, https://doi.org/10.1039/tf9534900154 . [all data]

Scott, Hubbard, et al., 1963, 2
Scott, D.W.; Hubbard, W.N.; Messerly, J.F.; Todd, S.S.; Hossenlopp, I.A.; Good, W.D.; Douslin, D.R.; McCullough, J.P., Chemical thermodynamic properties and internal rotation of methylpyridines. I. 2-methylpyridine, J. Phys. Chem., 1963, 67, 680-685. [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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