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Thermodynamic Study of N-methylformamide and N,N-Dimethyl-Formamide
Version 1
: Received: 12 February 2024 / Approved: 13 February 2024 / Online: 13 February 2024 (12:36:20 CET)
A peer-reviewed article of this Preprint also exists.
Růžička, K.; Štejfa, V.; Červinka, C.; Fulem, M.; Šturala, J. Thermodynamic Study of N-Methylformamide and N,N-Dimethyl-Formamide. Molecules 2024, 29, 1110. Růžička, K.; Štejfa, V.; Červinka, C.; Fulem, M.; Šturala, J. Thermodynamic Study of N-Methylformamide and N,N-Dimethyl-Formamide. Molecules 2024, 29, 1110.
Abstract
An extensive thermodynamic study of N-methylformamide (CAS RN: 123-39-7) and N,N-dimethylformamide (CAS RN: 68-12-2), is presented in this work. The liquid heat capacities of N-methylformamide were measured by Tian–Calvet calorimetry in the temperature interval (250 – 300) K. The vapor pressures for N-methylformamide and N,N-dimethylformamide were measured using static method in the temperature range 238 K to 308 K. The ideal-gas thermo-dynamic properties were calculated using a combination of the density functional theory (DFT) and statistical thermodynamics. A consistent thermodynamic description was developed using the method of simultaneous correlation, where the experimental and selected titerature data for vapor pressures, vaporization enthalpies, and liquid phase heat capacities and calculated ide-al-gas heat capacities are treated together to ensure overall thermodynamic consistency of the results. Resulting vapor pressure equation is valid from the triple point to the normal boiling point temperature.
Keywords
N-methylformamide; N,N-dimethylformamide; liquid phase; vapor pressure; vaporization enthalpy; heat capacity
Subject
Chemistry and Materials Science, Physical Chemistry
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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