Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

The vaporization enthalpies at T/K = 298.15 and vapor pressures from T/K = (283 to 313) of a series of tertiary aliphatic amines ranging in size from 12 to 24 carbons are evaluated using the literature values for triethylamine, tributylamine, N,N-dimethylbenzylamine, N,N-dimethyloctylamine, and N,N-dimethyldodecylamine by correlation gas chromatography. The vaporization enthalpies and vapor pressures evaluated are (?lgHm(298.15 K/kJ*mol 1, p/Pa (298.15 K)): triisobutylamine (52.3 +- 2.2, 113), tri-n-butylamine (58.0 +- 1.9, 28), N,N-dimethyltetradecylamine (77.3 +- 1.9, 0.091), N,N-dimethylhexadecylamine (84.8 +- 1.0, 0.011), tribenzylamine (92.4 +- 1.4, 5.1*10 4), tri-n-octylamine (100.1 +- 1.4, 1.4*10 4). These amines were used to evaluate the following vaporization enthalpies and vapor pressures (?lgHm(298.15 K kJ*mol 1, p/Pa (298.15 K)): (R)-deprenyl (64.3 +- 2.2, 2.5); (S)-benzphetamine (77.2 +- 0.7, 0.04); and alverine (89.3 +- 0.2, 1.4*10 3). The solid solid and solid to liquid phase transitions of tribenzylamine were also measured; ?crcrHm(342.5 K)/kJ*mol 1 = (1.1 +- 0.1); ?crlHm(365.6 K)/kJ*mol 1 = (23.0 +- 0.1). Adjusted to T/K = 298.15 and combined with the vaporization enthalpy at this temperature, the sublimation enthalpy resulted as ?crgHm(298.15 K)/kJ*mol 1 = (111.3 +- 2.1).