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

ABSTRACT

The vapor pressures p of 28 organic compounds were accurately measured by a static method in the temperatures range (273 to 323) K. These include: cyclic amines (CH2)nNH with n = 2-7, N-methylpyrrolidine, N-methylpiperidine, morpholine, Nmethylmorpholine, piperazine, N-methylpiperazine, N,N -dimethylpiperazine), cyclic ethers (tetrahydrofuran, 2-methyltetrahydrofuran, 2,5-dimethyltetrahydrofuran, tetrahydropyran, 1,3- dioxolan, 1,4-dioxan), cyclic and open-chain secondary alcohols (cyclopentanol, cyclohexanol, cycloheptanol, 2-butanol, 3-pentanol, 3-hexanol, 4-heptanol) as well as 2- methoxyethylamine and 3-methoxypropylamine. For 6 substances, no p data were already available in the literature at any temperature, and for other 8 only one paper each was found. The parameters of the Antoine equation were determined to allow interpolation and extrapolation of the experimental results. The enthalpy of vaporization, less thanvapH, at 298.15 was obtained for each compound from the derivative dp/dT. For 9 compounds, less thanvapH values had not been determined before. Either p and less thanvapH at 298.15 K for all substances considered were compared with available literature values. For p, the disagreement is less than 1 % for 10 substances and 1 to 3 % for other 8 compounds; for less thanvapH , it is less than 1 % with respect to 18 literature data, of which 10 are calorimetric. All this confirms the high precision of p measurements here reported.