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Urea, 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
Tfus373.8KN/ADellaGatta and Ferro, 1987Uncertainty assigned by TRC = 0.5 K; TRC
Tfus375.3KN/AZordan, Hurkot, et al., 1972Uncertainty assigned by TRC = 0.1 K; TRC
Quantity Value Units Method Reference Comment
Ttriple375.0KN/AFerloni and DellaGatta, 1995Uncertainty assigned by TRC = 0.2 K; TRC
Ttriple378.KN/AKabo, Miroshnichenko, et al., 1990Uncertainty assigned by TRC = 0.00001 K; TRC
Quantity Value Units Method Reference Comment
Deltasub95.5 ± 0.5kJ/molGSEmel'yanenko, Kabo, et al., 2006Based on data from 331. - 365. K.; AC
Deltasub97.10 ± 0.40kJ/molCKozyro, Kabo, et al., 1993crystal phase; ALS
Deltasub97.1 ± 0.4kJ/molN/AKozyro, Kabo, et al., 1993AC

Enthalpy of sublimation

DeltasubH (kJ/mol) Temperature (K) Method Reference Comment
95.730343.N/AKozyro, Kabo, et al., 1993DH
96.9 ± 1.2347.MEZaitsau, Kabo, et al., 2003Based on data from 322. - 371. K.; AC
96.8 ± 1.2350.MEZaitsau, Kabo, et al., 2003Based on data from 322. - 371. K.; AC
94.4 ± 0.8350.CZaitsau, Kabo, et al., 2003AC
94.38 ± 0.85343.CKozyro, Kabo, et al., 1993Hfusion=13.6±2.0 kJ/mol; ALS
94.4 ± 0.84343.CKozyro, Kabo, et al., 1993AC
99.3 ± 0.7337.CKabo, Miroshnichenko, et al., 1990, 2see Simirsky, Kabo, et al., 1987 and Simirskii, Kabo, et al., 1986; ALS
94.9 ± 0.6337.CKabo, Miroshnichenko, et al., 1990, 2AC
93.3 ± 1.2355.TEPiacente, Ferro, et al., 1990See also Ferro, Barone, et al., 1987.; AC
87.3348.N/AFerro, Barone, et al., 1987AC

Enthalpy of fusion

DeltafusH (kJ/mol) Temperature (K) Method Reference Comment
15.750373.8N/ADella Gatta and Ferro, 1987DH
12.5372.DSCHashimoto, Tajima, et al., 2005AC
16.6375.DSCFerloni and Gatta, 1995AC
14.06378.1N/AKabo, Miroshnichenko, et al., 1990, 2AC

Entropy of fusion

DeltafusS (J/mol*K) Temperature (K) Reference Comment
42.1373.8Della Gatta and Ferro, 1987DH

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.

DellaGatta and Ferro, 1987
DellaGatta, G.; Ferro, D., Enthalpies of fusion and solid-to-solid transition, entropies of fusion for urea and twelve alkylurea, Thermochim. Acta, 1987, 122, 143-52. [all data]

Zordan, Hurkot, et al., 1972
Zordan, T.A.; Hurkot, D.G.; Peterson, M.; Hepler, L.G., Enthalpies and entropies of melting from differential scanning calorimetry and freezing point depressions: urea, methylurea, 1, 1-dimethylurea, 1, 3- dimethylurea, tetramethylurea, and thiourea, Thermochim. Acta, 1972, 5, 21. [all data]

Ferloni and DellaGatta, 1995
Ferloni, P.; DellaGatta, G., Heat capacities of urea, N-methylurea, N-ethylurea, N-(n)propylurea, and N- (n)butylurea in the range 200 to 360 K, Thermochim. Acta, 1995, 266, 203-12. [all data]

Kabo, Miroshnichenko, et al., 1990
Kabo, G.Ya.; Miroshnichenko, E.A.; Frenkel, M.L.; Kozyro, A.A.; Simirsky, V.V.; Krasulin, A.P.; Vorob'eva, V.P.; Lebedev, Yu.A., Thermochemistry of Alkyl Derivatives of Urea, Izv. Akad. Nauk SSSR, Ser. Khim., 1990, No. 4, 750-5. [all data]

Emel'yanenko, Kabo, et al., 2006
Emel'yanenko, Vladimir N.; Kabo, Gennady J.; Verevkin, Sergey P., Measurement and Prediction of Thermochemical Properties: Improved Increments for the Estimation of Enthalpies of Sublimation and Standard Enthalpies of Formation of Alkyl Derivatives of Urea, J. Chem. Eng. Data, 2006, 51, 1, 79-87, https://doi.org/10.1021/je050230z . [all data]

Kozyro, Kabo, et al., 1993
Kozyro, A.A.; Kabo, G.J.; Krasulin, A.P.; Sevruk, V.M.; Simirsky, V.V.; Sheiman, M.S.; Frenkel, M.L., Thermodynamic properties of methylurea, J. Chem. Thermodyn., 1993, 25, 1409-1417. [all data]

Zaitsau, Kabo, et al., 2003
Zaitsau, Dz; Kabo, G.J.; Kozyro, A.A.; Sevruk, V.M., The effect of the failure of isotropy of a gas in an effusion cell on the vapor pressure and enthalpy of sublimation for alkyl derivatives of carbamide, Thermochimica Acta, 2003, 406, 1-2, 17-28, https://doi.org/10.1016/S0040-6031(03)00231-4 . [all data]

Kabo, Miroshnichenko, et al., 1990, 2
Kabo, G.Ya.; Miroshnichenko, E.A.; Frenkel, M.L.; Kozyro, A.A.; Simirskii, V.V.; Krasulin, A.P.; Vorob'eva, V.P.; Lebedev, Yu.A., Thermochemistry of urea alkyl derivatives, Bull. Acad. Sci. USSR, Div. Chem. Sci., 1990, 662-667. [all data]

Simirsky, Kabo, et al., 1987
Simirsky, V.V.; Kabo, G.J.; Frenkel, M.L., Additivity of the enthalpies of formation of urea derivatives in the crystalline state, J. Chem. Thermodyn., 1987, 19, 1121-1127. [all data]

Simirskii, Kabo, et al., 1986
Simirskii, V.V.; Kabo, G.Ya.; Frenkel, M.L., Enthalpies of combustion and of formation of monoalkyl derivatives of urea, Russ. J. Phys. Chem. (Engl. Transl.), 1986, 60, 1233-1234. [all data]

Piacente, Ferro, et al., 1990
Piacente, V.; Ferro, D.; Gatta, G. Della, Sublimation enthalpy of eleven alkyl derivatives of urea, Thermochimica Acta, 1990, 158, 1, 79-85, https://doi.org/10.1016/0040-6031(90)80054-3 . [all data]

Ferro, Barone, et al., 1987
Ferro, D.; Barone, G.; Della Gatta, G.; Piacente, V., Vapour pressures and sublimation enthalpies of urea and some of its derivatives, The Journal of Chemical Thermodynamics, 1987, 19, 9, 915-923, https://doi.org/10.1016/0021-9614(87)90038-3 . [all data]

Della Gatta and Ferro, 1987
Della Gatta, G.; Ferro, D., Enthalpies of fusion and solid-to-solid transition, entropies of fusion for urea and twelve alkylureas, Thermochim. Acta, 1987, 122, 143-152. [all data]

Hashimoto, Tajima, et al., 2005
Hashimoto, Masao; Tajima, Fukue; Eda, Kazuo; Yamamura, Kimiaki; Okazaki, Tadashi, Exploration of plastic-like phases in alkylurea systems. A thermal and X-ray study, Journal of Molecular Structure, 2005, 734, 1-3, 23-33, https://doi.org/10.1016/j.molstruc.2004.08.008 . [all data]

Ferloni and Gatta, 1995
Ferloni, Paolo; Gatta, Giuseppe Della, Heat capacities of urea, N-methylurea, N-ethylurea, N-(n)propylurea, and N-(n)butylurea in the range 200 to 360 K, Thermochimica Acta, 1995, 266, 203-212, https://doi.org/10.1016/0040-6031(95)02453-0 . [all data]


Notes

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