Abstract
Vapor pressures of ethylene glycol, hydroxyacetaldehyde, and hydroxyacetone were measured by using a standard closed system equipped with a vacuum line, built recently in our laboratory. First, our vapor pressures measurements of ethylene glycol and their excellent agreement with the literature in the studied temperature range, that is, (308 to 385) K, permitted us to validate our experimental setup and procedure. The data obtained in the temperature ranges of (296 to 356) K and (273 to 304) K were very satisfactorily (absolute relative deviations (ARD) < 2.5 %) fitted according to the Antoine’s equation: log10(P°hydroxyacetaldehyde/Pa) = 12.96 ± 0.82 − (3657 ± 238)/(T/K) and log10(P°hydroxyacetone/Pa) = 10.13 ± 0.06 − (2201 ± 153)/(T/K). Then, the resulting vapor pressures of both hydroxyacetaldehyde and hydroxyacetone at 293 K were P° = (3.0 ± 0.2) Pa and P° = (415 ± 20) Pa for hydroxyacetaldehyde and hydroxyacetone, respectively. The quoted errors correspond to 2σ obtained from the least-squares fit analysis and the estimated systematic relative error of 5 %. Finally, these experimental expressions of temperature dependences of P° then permitted the derivation of the enthalpy of vaporization for both compounds.
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