Journal of Chemical and Engineering Data, Vol.59, No.8, 2551-2562, 2014
Evaluation of the Vaporization Enthalpies and Liquid Vapor Pressures of (R)-Deprenyl, (S)-Benzphetamine, Alverine, and a Series of Aliphatic Tertiary Amines by Correlation Gas Chromatography at T/K=298.15
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 (Delta H-g(l)m(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 (Delta H-g(l)m(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; Delta H-cr(cr)m(342.5 K)/kJ.mol(-1) = (1.1 +/- 0.1); Delta H-1(cr)m,(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 Delta H-g(cr)m(298.15 K)/kJ.mol(-1) = (111.3 +/- 2.1).