Generalized treatment for the vapor pressure behavior of polar and hydrogen‐bonding compounds

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Abstract
The vapor pressure behavior of 25 polar compounds, including water and a number of alcohols, has been analyzed and subjected to a generalized treatment using the relationship, for a total of 1343 experimental measurements presented in the literature and covering the range included between their respective triple points and critical points. For each of these compounds, the parameters of this equation were established using a nonlinear regression numerical technique. The parameters resulting from this regression reproduce vapor pressures for all these polar compounds with an average deviation of 0.44 percent (1343 points).To extend the application of this vapor pressure relationship, the original parameters of these polar substances were correlated with their respective basic physical properties M, Tc, Pc and Tb. The resulting generalized parameters reproduce vapor pressures with an average deviation of 1.44 percent (1343 points) for all these polar and hydrogen‐bonding compounds. This generalized correlation can be applied for the reliable prediction of vapor pressures for polar substances for which inadequate information is available.

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